A beam of light strikes a mirror at angle of 23° to the normal. What is the angle between the incident and reflected beam?

A bullet fired from a gun is the scenario which describes conservation of momentum.

A closed system is one which is not affected by the any external force or activity. When a bullet is fired from a gun it generates a recoil velocity in the gun. This is due to the conservation of momentum. Initially the momentum of the system (gun + bullet) is zero. When a bullet is fired because of having less mass as compared to the gun, it escape out with more velocity. To conserve the momentum of the system the gun also generates velocity in the backward direction. Due to the heavy mass of the gun as compared to the bullet, this velocity is very less, which is called recoil velocity.

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Answer:

A car moves 65 km due east and then 45 km due west. The car has traveled 65 km east and 45 km west, so it has covered a total distance of 65 + 45 = 110 km.

However, the displacement is the final point minus the initial point and not the total distance traveled. In this case, the car has traveled 65 km east and 45 km west, so it is back to its initial point. Therefore, its total displacement is 0 km.

Answer: The total displacement of the car is 20 km West.

Explanation:

This is because it moved 65 km East and then 45 km West, which effectively cancels out 65-45 = 20 km of the Eastward movement.

It does not matter how much distance the car covered in total, it only matters the net distance it moved in a certain direction.

The distance d in front of the landing site should the supplies be dropped is v√(2h/g) meter. If the horizontal velocity of the airplane is v m/s and height of the plane from the ground is h.

Horizontal velocity of the airplane = v

height of the airplane = h

Initial velocity of the food, u = 0 m/s

From the second equation of motion,

S = ut +0.5gt²

h = 0.5gt²

t = √(2h/g)

It is time taken by the food to reach the ground. in this time the horizontal distance travelled by the food is, d = v × t

d = v × √(2h/g)

d = v√(2h/g)

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The parachute  would be made to be heavier and more efficient. Option A

We know that the way that the parachute functions would be related to the way that it is designed. We have to know that if the parachute is heavy, it is going to take a shorter time for the parachute to reach the ground because the air resistance would be overcome by the weight of the parachute.

For the redesign of the parachute. The best option is to ensure that the parachute us made in such a way that it is much heavy and able to travel through air easily.

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Answer: The company can design a parachute with more surface area.

Explanation: I just did the quick check and it was right!

According to the problem the frequency of the oscillation (in hz) is 2.33 hz.

Oscillation is a repetitive variation in the value of a physical quantity over time. It can involve a periodic change in the magnitude of a signal or the direction of a signal's movement. Examples include the swinging of a pendulum, the vibration of a tuning fork, the alternating current in an electrical circuit, and the periodic motion of a molecule. Oscillation is a key component of many natural phenomena, from ocean waves to the beating of a human heart. It is also a fundamental concept in physics, engineering, and mathematics. Oscillation is essential for the operation of numerous mechanical and electronic systems, from motors and generators to cell phones and radios.

The frequency of the oscillation (in hz) is 2.33 hz.
This is because frequency is equal to the inverse of the period (time) of the oscillation.
The period of the oscillation is 0.43 s, so the frequency is calculated by taking the inverse of 0.43 s,
which is 2.33 hz.

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The maximum efficiency attainable for a heat engine operating between two temperatures (QH > Qc) is determined by the Carnot efficiency.

The Carnot efficiency represents the maximum theoretical efficiency that can be achieved by any heat engine operating between two temperatures. The formula for the Carnot efficiency is:

Efficiency = (Qc / QH) / 1.

where Qc is the engine's heat absorbed from the cold reservoir and QH is the engine's heat rejected by the hot reservoir.

It is important to note that for a heat engine to reach Carnot efficiency, it must operate in a reversible manner; in other words, it must be able to run in a cycle that can be reversed without any loss of energy. In practice, it is difficult to achieve Carnot efficiency in real-world heat engines due to the presence of friction and other inefficiencies.

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When a material tends to obstruct the flow of electrons, electrical energy is converted into heat energy and light. All materials have a characteristic called electrical resistance. Ohms, or, are used to measure resistance.

The flow of electrons is in the opposite direction from the flow of current. Resistance is a conductor quality that prevents current from flowing. Electrons and ions collide as they pass across a conducting wire. The current is decreased as a result of these collisions, which convert some kinetic energy into thermal energy. The ohm is the SI unit of resistance. Regarding the movement of electrons, they naturally gravitate towards the +ve side due to their -ve charge, which is the opposite of the traditional direction of current flow (from +ve to -ve).

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31.08 N will be the weight of that object on mars which has a mass of 8.4 kg as the gravitational field strength is 3.7 n/kg on Mars.

As we know that weight is nothing just force a body exerts on the surface so in a similar way the weight will be mass* acceleration due to the planet(Mars in this case) (g) which is 3.7 n/kg given. So

W = mass* g

w = 8.4 * 3.7 => 31.08N

Each planet has different gravitational field strength that we call (g) in the case of earth it is calculated as 9.8 n/kg but generally, we take as 10 n/kg for simplifying the calculation, and Mars has 3.7 n/kg and moon has as just 1.4 n/kg.

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The additional force needed is 590 N.

Given,

Force of 110 N is applied in one direction and a force of 700 N is applied in other direction. In order to keep the box stationary, additional force applied is difference between the two applied forces.

i.e. Additional force = 700N - 110N = 590N

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Charges a and d, on the other two corners, have equal charge, while both b and c have a charge of 1.0 c, so the charge so that the force on b is zero is -2.8.

Charge is the material's physical quality that results in a force being applied to it when it is exposed to an electromagnetic field. You can have a positive or negative electric charge. Opposite charges attract one another while like charges repel one another. Neutral refers to an object that carries no net charge.

A square is a geometric shape with four equal-length sides and four right-angled corners. When diagonally opposite charges are paired, the fields inside every duo cancel in examples 1 and 2, leaving no net field at the centre.

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The change in the internal energy of the gas is found as 4189.6 J.

internal drive U is the sum of the kinetic energy brought about by the molecular motion and indeed the potential energy brought about by the vibrational motion as well as electric energy the atoms among molecules in a system or perhaps a body with clearly defined limits.

We will consider the gas to just be perfectly ideal.

Change in volume,

∆V= n* R*( T2 - T1)/ P

∆V = 7.33 * 0.082* 27.5 K/ 1

∆V  = 16.53 L

Now,

Work done for expansion,

W = - P*∆V = - 1 atm* 16.53 L

W = - 16.53 L atm

W = -16.53 L atm * (8.314 J/0.082 L atm)

W = - 1676 J

(0.082 L atm = 8.314 J)

Heat transfer, Q = n* Cp*(T2 - T1)

Q = 7.33* 3.5*8.314* 27.5

Q = 5865.6 J

We know that, Cp = 3.5*R, if  diatomic gas

As per first law of thermodynamics,

∆E = Q + W = 5865.6J - 1676 J

∆E  = 4189.6 J

Thus, the change in the internal energy of the gas is found as 4189.6 J.

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a) [tex]x(t)=x_0\cos(\omega t)x(t)=x 0\ cos(\omega t),[/tex] for example

b) Simple harmonic oscillation occurs for objects which experience a position (xx) dependent force (FF) of the form F=-CxF=−Cx, where C is some positive constant.

Simple harmonic oscillation is a type of oscillatory motion in which an object oscillates back and forth around an equilibrium position. It is a special type of periodic motion in which the restoring force is always proportional to the displacement of the object from its equilibrium position, and acts in the direction opposite to that of the displacement. This type of motion is usually modeled by a mass-spring system.

a) Simple harmonic oscillation occurs for objects whose motion can be defined by a sine or cosine curve. x(t)=x_0\cos(\omega t)x(t)=x 0 ​ cos(ωt), for example

b) Simple harmonic oscillation occurs for objects which experience a position (xx) dependent force (FF) of the form F=-CxF=−Cx, where C is some positive constant.

c) Simple harmonic oscillation occurs when an object regularly returns to an equilibrium position.

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The average force exerted by the bat on the ball is 3200N and the impulse delivered by the bat on the ball is 6.30kgm/s

(a) The impulse delivered by the bat to the ball can be calculated using the equation Impulse = Change in Momentum.

Therefore, the impulse is equal to the difference between the final momentum and the initial momentum of the ball.

mΔv=0.15×42=6.3kgm/s

(b) The average force exerted by the bat on the ball can be calculated using the equation Force = Impulse/Time. Therefore, the average force is equal to the impulse divided by the time that the two are in contact. The time is 2 × [tex]10^{-3}[/tex]s. Therefore, the average force is equal to 150 N.

6.30/2×[tex]10^{-3}[/tex]= 3200N

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An internet search to find information about the effects of electromagnetic fields on public health is highly dangerous to humans and other living organisms.

Electromagnetic fields may be defined as a combination of invisible electric and magnetic fields of force. They are typically generated by natural phenomena like the Earth's magnetic field but also by human activities, mainly through the use of electricity.

Electromagnetic fields highly impact numerous members of the public and have attributed a diffuse collection of symptoms to low levels of exposure to electromagnetic fields at home. Reported symptoms include headaches, anxiety, depression, nausea, fatigue, and loss of appetite.

Moderate to high Exposure to magnetic fields is strong enough can lead to dizziness, seeing light flashes, and feeling tingling or pain through stimulation of nerves. Exposure to radiofrequency fields that are strong enough can lead to the heating of body tissue, and result in damage to tissues and organs.

Therefore, an internet search to find information about the effects of electromagnetic fields on public health is well described above.

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The label B in the diagram represents wavelength (last option)

We'll determine what label B represents by defining the options given. This is shown below:

Crest: This is the maximum value of the upward displacement of a progressive wave.

Amplitude: This is the maximum displacement of a wave.

Trough: This is the minimum value of the downward displacement of a progressive wave.

Wavelength: This is the distance between two successive crest or trough of a wave

Now, we can see clearly that label B exist bewteen two crest.

Thus, from the definitions given above, we can conclude that lebel B represents wavelength (last option)

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Answer:

C

Explanation:

(C) Positively charged particles moved upward, causing the top of the rod to have a positive charge and the bottom of the rod to have a negative charge.

When a neutral and non-polarized conducting rod moves through a magnetic field, it will experience a force known as the Lorentz force. This force acts on the moving charges within the rod, and causes them to move perpendicular to both the direction of motion and the magnetic field. In this case, since the rod is moving to the right, and the magnetic field is pointing into the screen, the Lorentz force will act upward on the positively charged particles within the rod. This motion will cause a separation of charges in the rod, with the top having a positive charge and the bottom having a negative charge.

Approximate size s 700 is 29.4 m

The diffraction limit, which may be calculated using the formula = 1.22 / D, establishes the limit of the human eye's solution.

The circular aperture's mediator, D, and the wavelength are where you lick them.

The eye responds to wavelengths between 400 nm and 700 nm in our situation, where the dilated pupil has a diameter of about 8 mm = 8 10-3 m.

the formula is amended by including these values

λ = 400 nm θ = 1.22 400 10⁻⁹ / 8 10⁻³ = 6 10⁻⁵ rad

λ = 700 nm θ = 1.22 700 10⁻⁹ / 8 10⁻³-3 = 1.07 10⁻⁴ rad

The definition of radians is now: radians = s / R.

where the radius is R and s is the supported arc. For each scenario, let's identify the sarcos.

λ = 400 nm s 400 = θ R

S 400 = 6 10⁻⁵ 275

λ = 700 nm s_ 700 = 1.07 10⁻⁴ 275 10³

s 700 = 29.4 m.

The complete question is,

What is the smallest item on Earth that astronauts can see by eye when circling 275 kilometers above the planet and what is its approximate size?

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Answer:

When you pull with a force upward so that the box is just about to rise, the sum of the two tensions (one from the ceiling and one from your hands pulling) equal the weight of the box. Thus C + H = W; where C is the ceiling rope tension and H is the hand rope tension. W = mg, the weight of the box.

Because there is no mechanical advantage in the single pulley, C = H, the two tensions are equal. So, we can write 2H = W = mg; and thus, H = W/2 = mg/2 when the box is just about to rise. To raise the box, you must have 2H>W; so that H > W/2 which means you need to yank upward on the rope in your hand with a force H (your F) just a bit over half the weight of the box.

Now here’s the tricky part. Once you’ve gotten the box to accelerate (start moving), you can relax the force H a bit so that it exactly equals H = W/2. Why? Because by keeping the net force f = ma = W – 2H = 0, acceleration settles in at a = 0 and the box is neither speeding up nor slowing down. It is then at constant velocity, which is what you specified.

Lesson here is that it takes a bit more force to get something to start moving, but once it starts to move we need to slack off a bit to maintain a constant velocity (too much force and it continues to speed up, too little and it slows down).

PS: Your question starts off with “Energy” then you talk and ask about force. They are not the same thing. I recommend you read up on the differences between energy and force. That will avoid a lot of confusion in future physics studies.

Explanation:

.

A spanner with longer handle increases the torque which in turn requires less force to undo the bolt.

This is because the rotational effect of a force depends on the perpendicular distance of the line of action of the applied force from the axis of rotation. The greater the vertical distance, the less force is required to rotate the body. That's why a spanner has a long handle. Long handles relieve pressure due to increased surface area. A long handle wrench is recommended. The larger the area, the lower the pressure, and the larger the area, the lower the pressure. The longer the handle, the greater the torque, and it will be easier to open a stuck bolt with a certain amount of force.

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The mass of the fuel is 133 kilograms. The result is obtained by using the formula for the density.

The density is the mass of a substance per unit of volume. It can be expressed as

ρ = m/V

Where

A jet 747 is fueled with jet fuel.

Find the mass of the fuel!

We convert the units of volume and density.

V = 173.231 L

V = 173.231 dm³

V = 173.231 × 1/1000 m³

V = 0.173231 m³

ρ = 0.768 g/cm³

ρ = 0.768 × 1000 kg/m³

ρ = 768 kg/m³

Using the formula for a density, we will get the mass.

ρ = m/V

768 = m/0.173231

m = 0.173231 × 768

m ≈ 133 kg

Hence, the jet fuel has a mass of 133 kilograms.

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After 2.00 billion seconds you will be around 63 years assuming a 365 day year.

To know the answer you need to know the number of seconds in a year.

First, you need to multiply, 60 × 60

to find the number of seconds in an hour, which is 3600 seconds.

Then, multiply = 3600 × 24

to find the number of seconds in a day, which is 86,400 seconds.

Next, multiply = 86400 × 365

to find the number of seconds in a year, which is 31,536,000 seconds.

Finally, divide 2,000,000,000 by 31,536,000 and you will get about 63 years.

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The object was accelerating for 12 seconds and final velocity was 85m/s in south direction.

We can relate quantities like velocity, time, acceleration and displacement provided the acceleration remains constant. These relations are collectively known as the equation of motion. There are three equations of motion.

We know that from equations of motions : S = ut + 0.5 at^2

Where,

S = Distance or Displacement = 444 m (south)

u = initial speed = 11 m/s (north)

a = acceleration = 8 m/s^2 (south)

t =time

Now, Considering north to be positive direction, S = -444m and a = -8 m/s^2.

Putting these values in above equation we get:

8t^2 - 22t - 888 = 0

Solving this quadratic equation we get t = 12 seconds.

i.e. The object was accelerating for 12 seconds

Now, We also know that: v =u+ at

Where,

v = final velocity

u = initial velocity = 11m/s

a = acceleration = -8 m/s^2

t = time = 12 sec

Putting these values in above equation we get v = -85 m/s

Here, negative sign means that it is in s0uth direction.

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The student explains that conduction is the process of charging an object by touch. When two oppositely charged conductors make contact, this charge is divided between two conductors and is transferred to the uncharged conductor, which charges the conductor.

Conduction is one of the three main ways that heat energy is transferred.

Consequently, When two oppositely charged conductors make contact, this charge is divided between two conductors and is transferred to the uncharged conductor, which charges the conductor.

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while the fabric is negatively charged, becoming positively charged. The opposing charges that two objects get when they brush against one another are explained. according to convention law.

Because electrons are transported from the glass to the silk when a silk cloth is stroked across a glass rod, opposing charges are observed on both. Charge is neither generated nor destroyed during this procedure. Simply said, it is passed through one body to the other. The conservation law of charge therefore agrees with this observation.

We are aware of the mass that electrons have. Therefore, when we remove some electrons from of the body, it will become positively charged and lose mass. Consequently, when a silk is brushed on a glass rod.

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Answer:

250.025 Newtons

Explanation:

Fnet=ma

The acceleration of this object is [tex]-8.33 m/s^2[/tex] (negative acceleration means it is slowing down).

To calculate the acceleration of an object you can use the following formula:

a = (v_f - v_i) / t

where a is acceleration, v_f is final velocity, v_i is initial velocity, and t is time.

Velocity at x = 50 km/h and velocity at y = 5.56 m/s, and the time taken to move from point x to point y is 20 seconds, so plug these values ​​into the formula to get the acceleration: can ask. :

a = (5.56 m/s - (50 km/h)*(1000 m/km)/(3600 s/h)) / 20 seconds

a = (5.56m/s - 13.89m/s) / 20s

a = -8.33m/s^2

So the acceleration of this object is -[tex]8.33 m/s^2[/tex] (negative acceleration means it is slowing down).

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The amount of energy required to remove thermal energy is always greater or equal to the thermal energy removed, as per Second Law of Thermodynamics.

The Second Law of Thermodynamics is a fundamental principle of thermodynamics that states that the amount of energy required to remove a given amount of thermal energy from a system is greater than or equal to the amount of thermal energy removed.

This is also known as the Carnot's theorem and it is expressed mathematically as ΔQ < TΔS, where ΔQ is the heat absorbed or rejected, T is the temperature, and ΔS is the change in entropy. This means that it is impossible to completely convert heat into work, and some energy will always be lost as waste heat. This is why it is not possible to have a perpetual motion machine of the second kind.

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All forms of water entering and leaving the volume selected should be accounted for in order to accurately determine the temperature rise in the lake caused by the power plant.

When determining the temperature rise of a lake caused by a nearby power plant, it is important to consider all forms of water entering and leaving the selected volume.

This includes not only the water being withdrawn and returned by the power plant, but also any other sources of water entering or leaving the lake, such as precipitation, evaporation, and surface or ground water flow.

By accounting for all of these inputs and outputs, a more accurate understanding of the overall heat balance of the lake can be obtained and the impact of the power plant on the lake's temperature can be better understood.

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Option -C : Pressure stays the same because  it is only a function of depth .

When the diver moves horizontally, the pressure is unaffected as pressure is function of depth only.

since,

p = denisty × gravity × depth

so only depends on depth.

The molecules and atoms that make up the many layers of the atmosphere are continually moving in arbitrary directions. Despite their small size, when they hit a surface, they apply pressure that humans perceive as a force. Since molecules can flow in any direction, they can even apply air pressure to an object as they collide from below. Air pressure can be applied in all directions in the atmosphere. An object or person suspended in a fluid and moving with it experiences static pressure. The pressure that develops when a flow is isentropically slowed to zero velocity is known as the stagnation pressure. The air pressure in various environments will vary, which will have an impact on how the vehicle operates. Air is thinner at higher altitudes,

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Question :

a diver moves horizontally from the underside of a bridge structure (position 1) to open water (position 2). ignoring effects like currents in the water, what pressure change will the diver sense between positions?

A . pressure increases from 1 to 2 because the bridge keeps the atmosphere from pushing down on the water at position 1.

B .  pressure decreases  from 1 to 2 because the weight of the bridge pushes down on the water at position 1.

C. Pressure stays the same because  it is only a function of depth .

D. pressure  may increase or decrease  depending upon water properties like density.

If air resistance is negligible and our toy dart cannon generates a maximum initial velocity of 2.78 metres per second, we can shoot a dart up to a maximum distance of 0.74 metres from the ground.

Velocity is a time-dependent measure of how quickly an object's position changes in relation to a frame of reference. The velocity of an object indicates both its direction and speed of motion. Final velocity is a vector quantity that describes the speed and direction of a moving body after it has reached its maximum acceleration. The relationship between two points in physical space is given by the formula R = v2 sin2 theta/g.

R(max) equals v2/g if theta is 45 degrees.

R = 2.7^2 / 9.8 = .74 m

R = v^2 sin 2 theta / g

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