Assume that the downhill velocity is multiplied by 0.25 inverse seconds to get the acceleration caused by air resistance. Describe the initial value issue and its resolution.
How well does air resistance impact the rate at which items fall?Because air resistance slows down the motion of the falling object, it impacts acceleration during a fall to a lesser extent than gravity (g). The object's surface area and speed both influence the amount it slows down.
What are the issue and solution with initial value?A initial and boundary problem (IVP) in multivariable calculus consists of a normal differential equation and an initial condition that specify exact amount of the unknown variable at a specific location in the domain. In physics or even other sciences, modeling a system typically entails resolving an initial value dilemma.
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a 9500 pf capacitor holds plus and minus charges of 16.5 x 10e-8 c. what is the voltage across the capacitor?
According to the problem the voltage across the capacitor is 1.73 V.
What is capacitor?A capacitor is an electrical component that stores energy in the form of an electrostatic field. It is composed of two conducting plates separated by an insulating material called a dielectric. When a voltage is applied to the plates, the dielectric stores an electrical charge. Capacitors are used in a variety of electronic devices and are essential for the operation of many electrical and electronic systems.
The voltage across a capacitor is given by V = Q/C, where Q is the charge on the capacitor, and C is the capacitance.
In this case, the charge on the capacitor is 16.5 x 10-8 C, and the capacitance is 9500 pF = 9.5 x 10-8 F.
Therefore, the voltage across the capacitor is V = 16.5 x 10-8 C / 9.5 x 10-8 F = 1.73 V.
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Calculate the angular momentum of a ballet dancer who is spinning at 1.5 rev/sec. Model the dancer as a cylinder (I = MR 2) with a mass of 62 kg, a height of 1.6 m and a radius of 0.16 m.
The angular momentum of the ballet dancer is 14.98 kgm²/s.
What is the angular momentum of the ballet dancer?The angular momentum of the ballet dancer is calculated by applying the following formula as show below.
L = Iω
where;
I is the moment of inertia of the dancerω is the angular speed of the dancer = 1.5 rev/sec = 9.42 rad/sThe moment of inertia of the dancer, I = MR²
I = 62 kg x (0.16 m )²
I = 1.59 kgm²
The angular momentum of the ballet dancer is calculated as;
L = 1.59 x 9.42
L = 14.98 kgm²/s
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Using a balance, determine the mass of the ball and basket of the ballistic pendulum. Fire the ballistic pendulum and measure the maximum height the pendulum reaches. Use the conservation of energy (initial KE + initial GPE = final KE + final GPE, KE = 12mv2; GPE = mgh) to calculate the initial speed of the pendulum after the ball has collided with the pendulum basket. Next, use the conservation of momentum (total initial p = total final p; p = my) fo determine the initial speed of the ball before it collided with the pendulum basket.
The initial speed of the bullet before striking the basket of mass 1 kg is 1.98 m/s. Speed of each bullet is given below
To determine the mass of the ball and basket of the ballistic pendulum using a balance, you can simply weigh the pendulum and record its mass.
To calculate the initial speed of the pendulum after the ball has collided with the pendulum basket, you can use the conservation of energy. The initial kinetic energy (KE) of the ball is equal to the final kinetic energy of the pendulum (ball and basket combined), and the initial gravitational potential energy (GPE) of the ball is equal to the final GPE of the pendulum. The equation for KE is KE = 1/2mv^2, where m is the mass of the ball and v is its velocity. The equation for GPE is GPE = mgh, where m is the mass of the ball, g is the acceleration due to gravity (9.8 m/s^2), and h is the height of the pendulum at its maximum displacement.
Using the values for mass, height, and velocity, you can set up the conservation of energy equation as follows:
1/2mv^2 + mgh = 1/2(m + M)v_f^2 + (m + M)gh_f
where m is the mass of the ball, M is the mass of the pendulum basket, v is the initial velocity of the ball, v_f is the final velocity of the pendulum, h is the height of the pendulum at its maximum displacement, and h_f is the height of the pendulum at its maximum displacement after the collision.
Solving for v, we get:
v = sqrt(2gh)
Next, you can use the conservation of momentum to determine the initial speed of the ball before it collided with the pendulum basket. The conservation of momentum states that the total initial momentum of an isolated system is equal to the total final momentum of the system. The equation for momentum is p = mv, where m is the mass of the ball and v is its velocity.
Before the collision, the momentum of the ball is simply equal to its mass times its velocity:
p_i = mv
After the collision, the momentum of the pendulum is equal to the mass of the ball plus the mass of the pendulum basket times the final velocity of the pendulum:
p_f = (m + M)v_f
Setting the initial and final momenta equal to each other and solving for v, we get:
mv = (m + M)v_f
v = (m + M)v_f / m
So, by measuring the mass of the ball and basket, the maximum height of the pendulum, and the final velocity of the pendulum, you can use the conservation of energy and conservation of momentum to determine the initial velocity of the ball and the pendulum.
Speed of each bullet depending on the mass are:-
m (kg) v (m / s)
0.05 41.58
0.10 21.78
0.15 15.18
0.20 11.88
0.25 9.90
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Question - Using a balance, determine the mass of the ball and basket of the ballistic pendulum. Fire the ballistic pendulum and measure the maximum height the pendulum reaches. Use the conservation of energy (initial KE + initial GPE = final KE + final GPE; KE = ½mv2; GPE = mgh) to calculate the initial speed of the pendulum after the ball has collided with the pendulum basket. Next, use the conservation of momentum (total initial p = total final p; p = mv) to determine the initial speed of the ball before it collided with the pendulum basket.
a ufo going 64 m/s west suddenly experienced a constant acceleration for 63 s during which its displacement was 21,892.5 m west. determine the final speed of the ufo
The final speed of the UFO after experiencing a constant acceleration for 63 seconds is 351.3 m/s.
What is accelaration?Acceleration is the rate at which an object increases its speed, velocity or rate of change. It is the rate of change of velocity over time, or the rate of change of the position of an object. Acceleration can be either positive, when the speed of an object is increasing, or negative, when the speed of an object is decreasing.
The final speed of the UFO can be determined by using the equation, v = u + at, where u is the initial velocity, a is the acceleration, and t is the time. So, in this case, v = 64 + (21,892.5/63) = 351.3 m/s. Therefore, the final speed of the UFO after experiencing a constant acceleration for 63 seconds is 351.3 m/s.
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Wich of the following factors might influence a community decision to build a new power plant
Heat rates, thermal efficiencies, capacity factors, load factors, economic efficiencies, operational efficiencies, and energy efficiencies are all elements in power plants. A power plant's performance may be expressed using several typical performance factors: heat rate (energy efficiency) and thermal efficiency.
What are the three most important variables that influence plant growth?Water, light, temperature, and nutrients are the four most important factors influencing plant development. You might be asking where dirt comes into all of this. Plants may grow without soil using a technique known as hydroponics. Plants, on the other hand, cannot grow if they are not provided with the necessary nutrients.
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A positive charge is brought close to a fixed neutral Which of the figures best represents the charge distribution on the inner and outer walls of the conductor that has a cavity. The cavity is neutral; that is, there is no net charge inside the cavity. Which of the figures best represents the change distribution on the inner and outer walls of the conductor?
The correct option: (e) There is a negative charge on the surface of the cavity, and a positive charge on the outer surface of the conductor.
State the Gauss law for the conductor?Any extra charge on the a conductor will be located on its surface, according to Gauss' Law.
According to Gauss' Law, the surface's electric field and internal charge are related. The charge encapsulated by any surface on the inside of a conductor equals zero since there is no electric field there. Any charge here on conductor must therefore be located on its surface. There wouldn't be an electric field inside the conductor's vicinity if a cavity was cut out of it, and there wouldn't be any charge inside the cavity either. Therefore, the hollow wouldn't have an electric field. Because of electric field should be perpendicular to its surface and the conductor's internal electric field is zero, no flux can penetrate the conductor.Thus, on the cavity's surface there is a negative charge, while the conductor's outer surface has a positive charge.
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The complete question is-
A positive point charge is placed in a cavity inside a neutral conductor without transferring charge to the conductor. What is the sign of the charge on the surface of the cavity and the outer surface of the conductor?
(a) There is no charge on the surface of the cavity or the outer surface of the conductor.
(b) There is a positive charge on the surface of the cavity, but no charge on the outer surface of the conductor.
(c) There is a negative charge on the surface of the cavity, but no charge on the outer surface of the conductor.
(d) There is no charge on the surface of the cavity, but a positive charge on the outer surface of the conductor.
(e) There is a negative charge on the surface of the cavity, and a positive charge on the outer surface of the conductor.
Calculate the frequency bob if it's time period is 25 sec
The frequency and time interval are 2 seconds and 0.5 Hz, respectively.
One oscillation: The oscillating body moves completely back and forth in a single motion, or oscillation.
The frequency is the number of vibrations the body makes in a second.
Time span: This is the amount of time it takes a body to complete one oscillation.
Time period is equal to how long the pendulum swings over how many oscillations it makes.
20/10=2s
Frequency =1/Time 1/2 = 0.5Hz
In light of this, the time interval and frequency are 2 seconds and 0.5 Hertz, respectively.
What is the best way to define frequency?How frequently a periodic wave shape or signal repeats itself at a specific amplitude is expressed as frequency. It can be measured in hertz, kilohertz, megahertz, etc.
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a small metal sphere has a mass of 0.15 g and a charge of - 23.0 nc. it is 10.0 cm directly above an identical sphere that has the same charge. this lower sphere is fixed and cannot move. if the upper sphere is released, it will begin to fall. what is the magnitude of its initial acceleration?
The magnitude of the acceleration is |8.1 * 10^5| m/s^2 = 8.1 * 10^5 m/s^2
What is meant by acceleration?In mechanics, rate of change of velocity of an object with respect to the time is called as acceleration.
As it is known, F = k * (q1 * q2)/r^2
where F is force, k is Coulomb's constant (9 x 10^9 N * m^2/C^2), q1 and q2 are charges of the two spheres, and r is distance between the two spheres.
As we know that , F = m * a
a = F/m
a = (k * (q1 * q2))/r^2) / m
a = (9 * 10^9 N * m^2/C^2 * (-23 * 10^-9 C)^2) / (10^-2 m)^2
Acceleration of the upper sphere is a = -8.1 * 10^5 m/s^2. The negative sign indicates that acceleration is in opposite direction to the force, as expected, since the force is repulsive.
The magnitude of the acceleration is |8.1 * 10^5| m/s^2 = 8.1 * 10^5 m/s^2
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the internal resistance of a battery is 2 ohms. when a resistance of 10 ohms is connected to the battery, it draws 0.6 amp current. the emf of the battery is
The emf of the battery is 7.2 volts when the internal resistance of a battery is 2 ohms. when a resistance of 10 ohms is connected to the battery, it draws a 0.6 amp current.
Given,
Internal resistance, r = 2 ohms
Resistance connected, R = 10 ohms
Current, i = 0.6 amp
let emf = V
Using ohm's law in the circuit
V = i(r+R)
or V = 0.6(2+10) = 0.6 x 12
V = 7.2 volts
Therefore, the emf of the battery is 7.2 volts when the internal resistance of a battery is 2 ohms. when a resistance of 10 ohms is connected to the battery, it draws a 0.6 amp current.
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a 6 kg object starts from rest. it is then pushed by a 10 n force for 8 seconds. how much momentum does it have afterward?
The momentum of the object afterwards will be 80 Kgms-1.
Given the following data as per the question:
Mass of the object is given as 6 Kg
Force is given as 10 N in the question
Time is given as the following 8 sec
The value of the Momentum is same as impulse.
So, the formula of impulse is given as:
I = Ft
Where
I is the impulse
F is the force
and t is the time
From the given information,
F = 10 N
t = 8 secs
Therefore,
I = 10 × 8
I = 80 Ns.
Momentum is 80 Kgms-1.
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if a spring is released x meters from equilibrium, at what distance from equilibrium will it have acceleration equal to half its maximum acceleration?
When the stretch distances are at half of their maximum displacement, the acceleration will be half of its maximum value by Hooke's Law.
F= -kx
In accordance with Hooke's law, a principle of elasticity, for relatively minor deformations of an object, the displacement or size of the deformation is directly proportional to the deforming force or load The elasticity of an object is likewise governed by Hooke's law; for example, a metal spring can only be stretched so far before being broken by too much effort. A mass that we already have is then expanded out by x. Displacement and acceleration are inversely related. When the stretch distances are at half of their maximum displacement, the acceleration will be half of its maximum value.
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A projectile of mass 0.419 kg is shot from
a cannon, at height 6.2 m, as shown in the
figure, with an initial velocity v; having a
horizontal component of 6.7 m/s.
The projectile rises to a maximum height
of 1.6 m above the end of the cannon's barrel
and strikes the ground a horizontal distance
past the end of the cannon's barrel.
Find the magnitude of the initial vertical
velocity vector of the cannon-ball at the end
of the cannon's barrel. The acceleration of
gravity is 9.8 m/s².
The projectile's top height is indicated by the number h. Max equals u squared x divided by 2 g. In this case, the initial horizontal velocity is maximized by u square at a rate of 6 meters per second square.
Find height?The projectile's top height is indicated by the number h. Max equals u squared x divided by 2 g. In this case, the initial horizontal velocity is maximized by u square at a rate of 6 meters per second square.
This rate is then multiplied by two to get 9.8 meters per second square, which equals 1.84 meters.
The projectile can only fly as high as this, then. Here, we already know that the projector is located at a distance of h from the ground, which is the height the projectile has reached from ground level. Please excuse the distance, the cannon is h feet above the ground.
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expert answer 1 month ago a) determine the distance of the spectrum. write the equation for the diffraction grating for the sodium and substitute the required values to determine the initial angular position of the sodium spectrum of the first order. write the equation for the diffraction grating for the sodium and substitute the required values to determine the final angular position of the sodium spectrum of the first order. determine the angular separation of both closely spaced yellow lines of sodium of the first order. -- b) write the equation for the diffraction grating for the sodium and substitute the required values to determine the initial angular position of the sodium spectrum of the second order. write the equation for the diffraction grating for the sodium and substitute the required values to determine the final angular position of the sodium spectrum of the second order. determine the angular separation of both closely spaced yellow lines of sodium of the second order. -- c) write the equation for the diffraction grating for the sodium and substitute the required values to determine the initial angular position of the sodium spectrum of the third order. write the equation for the diffraction grating for the sodium and substitute the required values to determine the final angular position of the sodium spectrum of the third order. determine the angular separation of both closely spaced yellow lines of sodium of the third order. like 0 the
Where θ 1 is the angle of the first line, and θ 2 is the angle of the second line.
What is angle?Angle is the measure of a turn or displacement between two intersecting lines. Angles are typically measured in degrees, with 360 degrees in a full circle. acute angles are smaller than 90 degrees, while obtuse angles are larger than 90 degrees. Straight angles are exactly 180 degrees, while reflex angles are greater than 180 degrees.
The equation for the diffraction grating for the sodium is:
nλ = d sinθ
Where n is the order of the spectrum, λ is the wavelength of the light, d is the distance of the spectrum, and θ is the angle of the light.
For the first order, the initial angular position is:
nλ = d sinθ
θ = sin-1 (λ/d)
For the first order, the final angular position is:
nλ = d sinθ
θ = sin-1 (λ/d)
The angular separation of the two closely spaced yellow lines of sodium is:
Δθ = θ 1 - θ 2
Where θ 1 is the angle of the first line, and θ 2 is the angle of the second line.
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A new planet is discovered orbiting a star with a mass 3. 5 × 10^31 kg at a distance of 1. 2x10^11 m. Assume that the orbit is circular. What is the gravitational acceleration on this new planet?
The gravitational acceleration of this new planet is [tex]24.3 * 10^{9} G m/s^{2}[/tex].
Any object located in the field of the planet experiences a gravitational pull. Gravitational acceleration is described as the object receiving an acceleration due to the force of gravity acting on it. It is represented by ‘g’ and its unit is m/s2. Gravitational acceleration is a quantity of vector, that is it has both magnitude and direction.Using the following equation, the gravitational acceleration acting on anybody can be explained. When the object is on or near the surface of the body, the force of gravity acting on the object is almost constant and the following equation can be used:g = GM/R^2
Here,
G = the universal gravitational constant (G = gravitational constant of planet)
M = Mass of planet = [tex]3.5*10^{31} kg[/tex]
R = Radius = 1.2*10^11 m
Putting these values in above equation we get: g= [tex]24.3 * 10^{9} G m/s^{2}[/tex].
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a car drives straight off a flat cliff that is 57 m high (its initial velocity is purely horizontal). the point of impact is 130 m from the base of the cliff. how fast was the car traveling when it went over the cliff?
The speed of the car traveling when it went over the cliff is 38.12 m/s.
The equation of motion for calculating the displacement of a moving object is given as
[tex]S = ut + \frac{1}{2} at^{2}[/tex]
u = initial velocity
t = time taken
a = acceleration of the object
S = displacement of the object
The above equation can be used to find out the speed of the car.
In this case, the initial velocity, u, is zero because the car falls under gravity. The acceleration, a, will be considered as acceleration due to gravity (g). The time taken is the 'time of flight' taken as 't' and S is taken as the height (h) of the flat cliff.Therefore, the above equation can be written as
[tex]h = \frac{1}{2} gt^{2}\\t = \sqrt[]{\frac{2h}{g} } \\t = \sqrt[]{\frac{2(57)}{9.8} } \\\\t = 3.41 s[/tex]
Therefore, the time of flight = 3.41 s.
If the point of impact from the base of the cliff is 130 m and the time of flight is 3.41 s.
Then, the velocity of the car traveling over the cliff is calculated as
[tex]v = \frac{point of impact}{t} \\\\v = \frac{130}{3.41} \\\\v = 38.12 m/s[/tex]
The velocity of the car traveling when it went over the cliff is 38.12 m/s.
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A car is 180 inches long. A truck is 75 percent longer than rhe car. how long is the truck
The length of the truck that is 75 percent longer than the car is 315 inches.
What is the length of the truck?
The length of the truck that is 75 percent longer than the car is determined from the percentage increment of the truck from the car.
The length of the car is given as 180 inches, then the length of the truck that is 75 percent longer than the car is calculated as follows;
Lt = ( 75 % + 100 % ) x Lc
where;
Lt is the length of the truckLc is the length of the carLt = ( 175% ) x Lc
Lt = ( 1.75 ) x 180 inches
Lt = 315 inches
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a ball is released from height h above the floor. the system is defined to be ball-earth. air resistance is negligible. when the ball is halfway to the ground (i.e. at height h/2), is its kinetic energy more than, less than, or equal to half of its maximum kinetic energy?
When the ball is halfway to the ground (i.e. at height h/2), is its kinetic energy is more than, its maximum kinetic energy.
Air exerts a force known as air resistance. Like a sports vehicle with a streamlined design will encounter reduced air resistance and experience less drag, the automobile would be able to move more quickly than a truck with a flat front.
Air resistance is what generates this force. The force of air resistance slows an object's descent to the ground more as its mass decreases. Regardless of how much their masses differ, if two items were put on the moon, where there is no air, they would fall at the same rate.
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how much natural gas (1019 btu/ ft3) is needed to generate the electricity needed to keep a 100- watt (w) light bulb lit for one (1) year if the overall efficiency of the generating station is 40%?
Only about 40 percent of the thermal energy in coal is converted to electricity, so the electricity generated per ton of coal is 0.4 x 6,150 kWh or 2,460 kWh/ .
Define natural gas?
Natural gas is an odorless, gaseous mixture of hydrocarbons—predominantly made up of methane (CH4). It accounts for about 30% of the energy used in the United States.It is, as the name suggests, a naturally occurring flammable gas that can be used as a fuel or source of energy for a wide range of purposes like cooking, heating, transportation, and power generation.It is formed when layers of decomposing plants and animals are subject to intense heat from the Earth and pressure from rocks. All this pressure, heat and millions of years turned the natural material into coal, petroleum and natural gas.
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The lowest outdoor temperature ever recorded on Earth is -128. 6°F,
recorded at Vostok Station, Antarctica, in 1983. What is this temperature
on the Celsius and Kelvin scales?
The lowest recorded air temperature at the surface of the Earth was a measurement of −89.2°C made at Vostok station, Antarctica, at 0245 UT on 21 July 1983. Here we present the first detailed analysis of this event using meteorological reanalysis fields, in situ observations and satellite imagery.
What is meant by temperature?
The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature.Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points and thermometric substances.One of the seven base units in the International System of Units is the kelvin (SI).All areas of natural science, including physics, chemistry, Earth science, astronomy, biology, ecology, material science, metallurgy, mechanical engineering, geography, and most aspects of daily life, depend on temperature. These fields include medicine, biology, ecology, and most other branches of science.It can be very closely approximated experimentally but never actually reached, as stated in the third rule of thermodynamics. At that temperature, it would be difficult to produce heat from a body.To learn more about temperature refer to
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A 1400 kg car traveling at 13.5 m/s to the south collides with a 6400 kg truck that is initially at rest at a stoplight. The car and truck stick together and move together after
the collision. What is the final velocity of the two-vehicle mass? Assume that North is positive. Answer in units of m/s. Answer in units of m/s.
The final velocity of the two-vehicle mass is 2.42m/s.
What is Momentum?Momentum is defined as the product of mass and velocity of an object which is a vector quantity, which has a magnitude and a direction. If m is the mass of an object and v is its velocity, then p is the momentum of the object: [tex]\mathbf{p} = m \mathbf{v}.[/tex]
For above given information,
[tex]m_1= 1400kg\\m_2= 6400kg\\v_1_i=-13.5 m/s\\v_2_i= 0m/s[/tex]
Formula for this is:
[tex]m_1.v_1_i+m_2.v_2_i= (m_1+m_2)v_f[/tex]
(1400.-13.5)+ (6400.0) = (1400+6400).[tex]v_f[/tex]
-18900=7800.[tex]v_f[/tex]
-18900/7800=[tex]v_f[/tex]
[tex]v_f= 2.42m/s[/tex]
Thus, the final velocity of the two-vehicle mass is 2.42m/s.
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35. an object of mass 3.00 kg, moving with an initial velocity of 5.001 m/s, collides with and sticks to an object of mass 2.00 kg with an initial velocity of -3.00j m/s. find the fi- nal velocity of the composite object. brainly
The final velocity of the composite object after collision is 1.8002 m/s in the direction of the first object.
Initial velocity of the first object, v₁ = 5.001 m/s
Mass of the first object, m₁ = 3.0 kg
Initial velocity of the second object, v₂ = -3.001 m/s (In opposite direction)
Mass of the second object, m₂ = 2.0 kg
Let the final velocity of the composite object, = V
Mass of the composite object, = (3.0 + 2.0) = 5.0 kg
By the law of conservation of momentum,
m₁v₁ + m₂v₂ = (m₁ + m₂) × V
V = (m₁v₁ + m₂v₂)/(m₁ + m₂)
V = (3 × 5.001 + 2 × (-3.001))/(2 + 3)
V = 9.001/5
V = +1.8006 m/s
Positive sign indicates that the direction of the velocity will be the same as that of the first object.
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a person is about 6 orders of magnitude larger than a cell. the cell is about 3 orders of magnitude larger than a molecule. by how many orders of magnitude is a person larger than a molecule?
The order of magnitude describes a relative larger or smaller quantity. Find out what a molecule means by orders of magnitude and how they are determined.
Greater in magnitude means what?In different situations, the term "order of magnitude" is also employed more loosely. Simply said, the phrase can refer to something that is much larger or smaller, a very huge or little number, a small or large volume of something, etc.
What is a quantity's order of magnitude?A number pf powers of 10 or even the numbers of power of 0.1 inside a negative number determines the order of magnitude. Ordinarily, an order of magnitude was expressed as 10 to a nth power. The order in magnitude is represented.
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While you are asleep, your body needs to get rid of about 64 J of waste heat every second. The body does this by transferring the heat from the interior of your body (temperature 37°C) to the skin (temperature 30°C), where it is radiated away. By how much does this heat transfer change the body’s entropy each second?
The body does this by transferring the heat from the interior of your body. 0.2104 J/K is heat transfer change the body’s entropy each second
Calculating:The following formula can be used to determine the change in entropy caused by heat transfer:
S = Q / T, where S is the entropy change,
Q is the heat transferred, and
T is the heat transfer temperature. The temperature is 30°C (303 K) and the heat transfer rate is 64 J/s in this instance.
ΔS = [tex]\frac{64}{303}[/tex] = 0.2104 J/ K
It is essential to keep in mind that heat transfer from the body to the skin is not reversible, resulting in an increase in the body's entropy.
Entropy: What is It?The thermodynamic property entropy measures a system's disorder or randomness. It is related to the number of possible microstates (or ways in which a system can be arranged) that correspond to a particular macrostate (or observable state) of a system. It is frequently used to describe the degree of randomness or disorder within a system. The second law of thermodynamics states that systems tend to progress toward a state with greater entropy.
The International System of Units (SI) defines entropy as having Joules per Kelvin (J/K) units. Because it is a state function, the change in entropy only depends on the system's initial and final states, not on how the system got from one state to another.
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a ball is thrown horizontally from the top of a 70.6-m building and lands 188 m from the base of the building. ignore air resistance. how long is the ball in the air?
A ball launch horizontally from the top of a 70.6-m building lands 188 m from the building's base. The ball will fly for 3.79 seconds.
A displacement is a vector whose length is the shortest distance between a moving point's initial and final positions.
The beginning velocity in the problem is described as horizontal, which implies that the initial vertical velocity(u) is zero. In order to solve for the time of flight using the formula, we also have the height of the building, which is a downward displacement.
We know,
[tex]Y = ut + \frac{1}{2}at^{2}[/tex]
Here, Y = height of the building = 70.6m, u = 0, a = g = 9.81m/[tex]s^{2}[/tex]. We have to find the time of flight t.
⇒ [tex]70.6 = 0*t + \frac{1}{2} (9.81)t^{2}[/tex]
⇒ [tex]t^{2} = 14.3934[/tex]
⇒ [tex]t = 3.79 s[/tex]
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two point charges placed 5 cm aparnt on the xa axis. at what points along the x axis is the potential zero?
The point where the potential is zero is located at [tex]x = 5 cm * k * Q1/(Q1 + Q2)[/tex]
The potential at a point in space due to a point charge is given by the equation:
V = k * Q/r
where V is the potential, k is the Coulomb constant [tex](8.99 x 10^9 N * m^2/C^2)[/tex], Q is the charge, and r is the distance from the point charge to the point where the potential is being calculated.
In this problem, we have two point charges placed 5 cm apart on the x-axis. How about we call the charges Q1 and Q2, and we should assume that Q1 is located at the origin (x = 0) and Q2 is located at x = 5 cm.
The potential at a point along the x-axis is the amount of the potentials due to each of the point charges.
V = k * Q1/r1 + k * Q2/r2
where r1 is the distance from the point to Q1 and r2 is the distance from the point to Q2.
In the event that the potential at a point is zero, the amount of the potential due to each of the point charges is zero.
So, k * Q1/r1 + k * Q2/r2 = 0
To find the points along the x-axis where the potential is zero, we can set the equation above equal to zero and address for x.
r1 = x and r2 = |x - 5 cm|
k * Q1/x + k * Q2/|x - 5 cm| = 0
x = k * Q1/Q2 * |x - 5 cm|
x = k * Q1 * (5 cm - x)/Q2
x = 5 cm * k * Q1/(Q1 + Q2)
In this way, the point where the potential is zero is located at
x = 5 cm * k * Q1/(Q1 + Q2)
This is valid for any point in the x-axis, and these points are called equipotential points.
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an object travels in a circular orbit. if the speed of the object is doubled, its centripetal acceleration will be
If an object is traveling in a circular orbit where its speed is doubled, then its centripetal acceleration will be quadrupled.
Centripetal acceleration is the acceleration of an object traversing a circular path. Because velocity is a vector quantity, i.e., it has both a magnitude ( the speed and a direction), so when the object travels on a circular path, its direction changes constantly and thus as a result of this its velocity changes, producing acceleration,
For instance, when an object in a circular orbit is moved with double doubled, then it has quadrupled centripetal acceleration.
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an object of ma 0.40kg attached to the end of a tring i whirled round in an horizontal circle of radiu 2m with a contant peed of 8m/ calculate the angular velocity of the object
Explanation:
angular velocity = w = v/r
w = 8/2
w = 4rad/s
can an object be charged negatively with the help of a positively charged object? select all that apply 1. no; negative charges can only be obtained with other negatively charged objects. 2. yes, by letting the two objects touch each other 3. yes, by bringing the positively-charged object near the object to be charged, then discharging the far side 4. yes, by rubbing the two objects together 5. yes, by bringing
Yes, by bringing the positively-charged object near the object to be charged, then discharging the far side.
What is positively-charged?Positively-charged particles, or ions, are atoms or molecules that are missing one or more electrons, giving them a surplus of positive charge. This imbalance between the number of protons and electrons causes the particle to be attracted to objects with a negative charge, such as other ions.
The positively-charged object will cause electrons to be transferred to the object to be charged, thus resulting in a negative charge on the object.
Yes, by rubbing the two objects together. By rubbing the two objects together, electrons can be transferred from one object to the other, thus resulting in negative charge on one object and positive charge on the other.
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Korbel pushes a 15 kg chair for a distance of 30 meters. How much
work did he do?
The work that has been done by the Korbel is 4.41kJ.
What is the work done?We have to note that we define work in physics as the product of the force and the distance. In the case of the chair in the question, we have been told that Korbel pushes a 15 kg chair for a distance of 30 meters.
The force in this case would be the weight of the chair that we have and we can write that;
W = mgh
m = mass
g = acceleration due to gravity
h = height
Thus
W = 15 * 9.8 * 30
W = 4.41kJ
Thus a work of about 4.41kJ is done.
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what is your instantaneous speed at the instant you turn around to move in the opposite direction? (a) depends on how quickly you turn around; (b) always zero; (c) always negative; (d) none of the above.
The instantaneous speed at the instant you turn around to move in the opposite direction is (b) always zero.
We know that the average speed for a given time interval is the total distance traveled divided by the total time taken. As this time interval approaches zero, the distance traveled also approaches zero. But the limit of the ratio of distance and time is non-zero and is called the instantaneous speed. To understand it in simple words we can also say that instantaneous speed at any given time is the magnitude of instantaneous velocity at that time.Instantaneous velocity is defined as the rate of change of position for a time interval which is very small (almost zero). Measured using SI unit m/s. Instantaneous speed is the magnitude of the instantaneous velocity. It has the same value as that of instantaneous velocity but does not have any direction.To know more about speed visit:
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