Answer: (A)The net force was not 0 on the skater during her motion.
Explanation:
The net force was not 0 on the skater during her motion. The roller skated slowed down, which indicates that there is another force acting on her roller skates.
The correct statement is "The net force was 0, which is why the skater moved in a straight line." The correct answer is B.
What is Newton's First Law of Motion?Newton's First Law of Motion, states that an object at rest or in motion will remain at rest or in motion with a constant velocity in a straight line unless acted upon by an external force. In this case, the skater is traveling at a constant velocity, which means that the net force acting on her must be zero.
Option A is incorrect because if the net force was not zero, then the skater would not have moved in a straight line. She would have accelerated or changed direction, as per Newton's Second Law of Motion.
Option C is also incorrect because the skater's inertia does not have any effect on the forces acting on her. Inertia is a property of matter that resists changes in motion, but it does not cause any forces to be unbalanced.
Option D is incorrect because the action-reaction pair of forces cancel each other out and do not affect the skater's motion. The action-reaction pair only affects the interaction between two objects, but it does not affect the motion of a single object.
Therefore, The correct option is B i.e. The net force was 0, which is why the skater moved in a straight line.
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At the moment when a shot putter releases a 5.00kg shot, the shot is 3.00m above the ground and traveling at 15.0m/s. It reaches a maximum height of 14.5m above the ground and then falls to the ground. If air resistance is negligible, what was the potential energy of the shot as it left the hand relative to the ground?
The potential energy of the shot as it left the hand relative to the ground would be -524 J.
Potential energy calculationAt the moment the shot putter releases the shot, the total energy of the system is:
E = KE + PE
where KE is the kinetic energy of the shot and PE is its potential energy relative to the ground. We can assume that the kinetic energy is entirely due to the motion of the shot in the horizontal direction, so we can write:
KE = (1/2)mv^2
where m is the mass of the shot, and v is its horizontal velocity. Substituting the known values, we get:
KE = (1/2)(5.00 kg)(15.0 m/s)^2 = 1125 J
At the maximum height of 14.5 m, the shot has zero kinetic energy, so all its energy is potential energy:
PE = mgh
where g is the acceleration due to gravity and h is the height above the ground. Substituting the known values, we get:
PE = (5.00 kg)(9.81 m/s^2)(14.5 m - 3.00 m) = 601 J
Therefore, the potential energy of the shot as it left the hand relative to the ground was:
PE = E - KE = 601 J - 1125 J = -524 J
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A bear walks 9 meters north, stops to munch on some berries, then walks another 12 meters north. What is the bear's total distance travelled AND his displacement?
The bear's total distance traveled is 21 meters and its displacement is 3 meters north.
How to determine the bear's of total distance travelled and his displacement ?
The bear's total distance traveled is the sum of the distances covered in each leg of the journey, which is:
Total distance traveled = 9 meters + 12 meters = 21 meters
The bear's displacement is the straight-line distance between the starting point and the ending point of the journey, regardless of any intermediate stops.
Since the bear is moving only north, the displacement is simply the difference between the final and initial positions in the north direction, which is:
Displacement = 12 meters - 9 meters = 3 meters north
Therefore, the bear's total distance traveled is 21 meters and its displacement is 3 meters north.
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200g of olive oil is at 80°C in a container. If another 50g of olive oil at 20°C is added to the container, what will the final temperature be?
(please with solution)
The resultant final temperature is roughly around 61.7°C.
What is Principle of conservation of energy?According to the principle of conservation of energy, a system's overall energy level is constant.
According to the question,
Let Q1 = heat that the heated olive oil has absorbed.
Let Q2= heat that the heated olive oil has released.
Q1 + Q2 = 0 {according to the energy conservation principle}
What is Heat?For absorption of heat by the hot olive oil
Q1 = m1 × c × ΔT1 {Q is the heat absorbed or emitted, m is the sample's mass, and c is olive oil's specific heat capacity = 4.18 J/g °C ΔT stands for temperature change.}
Given- M1= 200g, c= 4.18g, T=80°C
Q1 = 200 g × 4.18 J/g °C × ([tex]T_{f}[/tex] - 80°C)
For the heat released by the the warmth that the cold olive oil emits:
Q2 = m2 × c × ΔT2
Q2 = 50 g × 4.18 J/g°C × ( - 20°C)
Q1 + Q2 = 0 {on equating the equation}
200 g × 4.18 J/g °C × ([tex]T_{f}[/tex] - 80°C) + 50 g × 4.18 J/g °C × ([tex]T_{f}[/tex] - 20°C) = 0
[tex]T_{f}[/tex] = (200 g × 4.18 J/g °C × 80°C + 50 g × 4.18 J/g °C × 20°C) / (200 g × 4.18 J/g °C + 50 g × 4.18 J/g °C)
[tex]T_{f}[/tex] = 61.7°C
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A mini copper of mass 1350kg is travelling at speed of 100km/hr and travel at a distance of 45 m before coming to rest . Determine the magnitude of the net force required to bring the machine to rest and state the direction with regards to initial velocity
Answer:
The net force required to bring the car to rest is 11,900 N. Since the car is slowing down, the direction of the net force must be opposite to the initial velocity. Therefore, the direction of the net force is opposite to the initial direction of the car's motion.
Explanation:
First, we need to convert the speed from km/h to m/s:
100 km/h * (1000 m/km) / (3600 s/h) = 27.78 m/s
The initial kinetic energy of the car is:
KE = (1/2) * m * v^2
KE = (1/2) * 1350 kg * (27.78 m/s)^2
KE = 535,500 J
To bring the car to a stop, the net force applied over the distance traveled must equal the initial kinetic energy. So:
work done = force * distance = KE
Rearranging this equation, we get:
force = KE / distance
Substituting the values we have, we get:
force = 535,500 J / 45 m
force = 11,900 N
The net force required to bring the car to rest is 11,900 N. Since the car is slowing down, the direction of the net force must be opposite to the initial velocity. Therefore, the direction of the net force is opposite to the initial direction of the car's motion.
What is the acceleration of gravity from the Earth when you are one full Earth radius height above the surface of the earth?
Select the answer below in terms of the acceleration at the surface, g.
A.2g
B.g
C. g/2
D. g/4
Answer:
Explanation:The acceleration due to gravity at a distance equal to one full Earth radius above the surface of the Earth is given by:
g' = g/(1 + R/E)^2
Where g is the acceleration due to gravity at the surface of the Earth, R is the radius of the Earth, and E is the distance of the object from the center of the Earth.
Substituting R for E+R, we get:
g' = g/[1 + (E+R)/R]^2
g' = g/[1 + (1+E/R)]^2
g' = g/[1 + (1+1)]^2 (Since E/R is very small compared to 1)
g' = g/16
Therefore, the acceleration due to gravity at a distance equal to one full Earth radius above the surface of the Earth is g/16. Answer: D. g/4.
Answer:
The acceleration of gravity decreases as you move away from the surface of the Earth. The acceleration of gravity at a height of one Earth radius above the surface can be found using the formula:
g' = (R/(R+h))^2 * g
where R is the radius of the Earth, h is the height above the surface, and g is the acceleration due to gravity at the Earth's surface.
If we plug in R = 6,371 km (the radius of the Earth) and h = 6,371 km (one Earth radius above the surface), we get:
g' = ((6,371 km)/(2*6,371 km))^2 * g
g' = (1/2)^2 * g
g' = g/4
Therefore, the answer is D. g/4.
Two identical blocks are connected by a lightweight string that passes over a lightweight pulley that can rotate about its axle with negligible friction. The two-block system is released from rest and the blocks accelerate. Which of the following correctly relates the potential energy gained by the block 1-Earth system |∆U1| to the potential energy lost by the block 2-Earth system |∆U2| and provides correct evidence?
A car is moving along a road at 13.0 m/s with an engine that exerts a force of 1,775.0 N on the car to balance the drag and friction so that the car maintains a constant speed. What is the power output of the engine?
Answer:
The power output of the engine can be calculated using the formula:
Power = Force x Velocity
where force is the net force acting on the car, and velocity is the speed of the car. In this case, the net force is equal to the force exerted by the engine, which is 1,775.0 N, since the car is moving at a constant speed and there is no acceleration. The velocity of the car is 13.0 m/s. Thus, the power output of the engine can be calculated as:
Power = 1,775.0 N x 13.0 m/s = 23,075 W
Therefore, the power output of the engine is 23,075 watts.
When landing after a spectacular somersault, a 35.0 kg gymnast decelerates by pushing straight down on the mat. Calculate the force (in N) she must exert if her deceleration is 7.00 times the acceleration of gravity. (Enter a number.)
The force (in N) she must exert if her deceleration is 7.00 times the acceleration of gravity is 245 N
Calculation of ForceGiven data
Deceleration = 7.00 times the acceleration of gravity (9.81 m/s2)Mass = 35.0 kgForce = Mass x Acceleration
Force = 35.0 kg x (7.00 x 9.81 m/s2)
Force = 245 N
The force required for the 35.0 kg gymnast to decelerate after a somersault is 245 N. This force is calculated by multiplying the mass of the gymnast by the deceleration of 7.00 times the acceleration of gravity.
The amount of force is necessary to slow down the gymnast and reduce the impact of the landing. Without this force, the gymnast could be injured from the sudden stop.
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Hans figures out one math problem easily and then applies that solution to the rest of the problems on the page; however, he gets the rest of the answers wrong. Hans has encountered a common problem with:
Answer:
Explanation:
overgeneralization or applying a single solution to a variety of problems without considering their unique characteristics. This is a common issue in math and other problem-solving situations where individuals may rely too heavily on past successful solutions without adjusting for the specific details of each new problem.
Two identical billiard balls are rolling toward each other at the same speed. What will be true after they collide head–on?
They will both stop rolling immediately after the collision.
One ball will stop rolling as the other bounces backward at a slower speed.
They will both bounce back at a faster speed after the collision.
They will both bounce back at the same speed they had before the collision.
Answer:
After the head-on collision, both identical billiard balls will bounce back at the same speed they had before the collision. This is because of the conservation of momentum, which states that the total momentum of a closed system remains constant if no external forces act on it. In this case, the two billiard balls are a closed system, and their total momentum before the collision is equal and opposite to their total momentum after the collision. Therefore, they will both bounce back with the same speed they had before the collision.
Explanation:
7. A student pushed a box 25.0 meters across a smooth, horizontal floor using a constant force of 112 Newtons. If the force was applied for 7.00 seconds, how much power was developed?
The power developed was 1,568 Watts, the calculation is seen in the section below.
Computation of PowerIn science and engineering, power is the rate at which work is done or energy is delivered. It can be expressed as the product of the work done (W) or the energy transferred (E) divided by the time interval (t).
Given data
Distance = 25.0 metersApplied Force = 112 NewtonsTime = 7.00 seconds,We know that expression for Power is given as
Power = (Force x Distance) / Time
Substituting our data into the expression we have
Power = (112 N x 25.0 m) / 7.00 s
Power = 1,568 Watts.
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I need guidance in this one
The clay ball that could stick to the door would be more effective when you want to shut the door from a distance be throwing a n object.
Will a rubber ball or a clay ball do better at helping you shut a door when thrown at the door?The effective way to shut the door could be through the use of the clay ball that could stick to the door and push it to the place where it could jam rather than the rubber ball that would bound back.
The best way to shut a door is to use the door handle or knob to pull the door towards you and guide it into the door frame until it clicks shut.
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A particle executes simple harmonic motion with an amplitude of 3.00 cm. At what position does its speed equal half of is maximum speed?
Answer:
2.34
Explanation:
To find the position where the speed is half of its maximum speed, we can set v = v_max/2 and solve for x:
v_max/2 = ω√(A^2 - x^2)
Substituting the given values, we have:
(ωA)/2 = ω√(A^2 - x^2)
Simplifying and rearranging:
A^2 - x^2 = (A/2)^2
x^2 = A^2 - (A/2)^2
x^2 = (3.00 cm)^2 - (1.50 cm)^2
x = √(6.75 cm^2 - 2.25 cm^2)
x = √5.50 cm^2
x ≈ 2.34 cm
Therefore, the position where the speed of the particle is half of its maximum speed is approximately 2.34 cm from the equilibrium position.
A student heats the same amount of two different liquids over Bunsen burners. Each liquid is at room temperature when the student begins. If Liquid 1 has a higher specific heat than Liquid 2, then Liquid 1 will
Answer: Liquid 1 heats more slowly than 2
Explanation:
Liquid 1 heats more slowly than 2 because it has a higher specific heat.
(Hope this helps!)
A car is moving at 32 miles per hour. The kinetic energy of that car is 5 × 10^5 J.
How much energy does the same car have when it moves at 101 miles per hour?
Answer in units of J.
Answer:
The car has approximately 1.42 × 10^6 J of energy when it moves at 101 miles per hour.
Explanation:
First, we need to convert the initial velocity and kinetic energy to SI units:
Initial velocity: 32 miles per hour = 14.3 meters per second (rounded to 2 decimal places)
Kinetic energy: 5 × 10^5 J (given)
Next, we can use the formula for kinetic energy:
KE = (1/2)mv^2
where KE is the kinetic energy, m is the mass of the car, and v is the velocity of the car.
Solving for mass:
m = 2KE/v^2
Substituting the given values:
m = 2(5 × 10^5 J) / (14.3 m/s)^2 ≈ 1569.93 kg (rounded to 2 decimal places)
Now, we can use the same formula to calculate the kinetic energy of the car when it moves at 101 miles per hour (rounded to 2 decimal places):
KE = (1/2)mv^2 = (1/2)(1569.93 kg)(45.06 m/s)^2 ≈ 1.42 × 10^6 J
Therefore, the car has approximately 1.42 × 10^6 J of energy when it moves at 101 miles per hour.
which one defines force?
Answer:
a
Explanation:
a push or a pull that occurs when an object interacts with another object or field.
pls mrk me brainliest
A spring is compressed while two steel balls of mass m1 = 2.5 kg and m2 = 1.6 kg. If m1 experiences an acceleration of 2.0 m/s² to the left, then what is the acceleration (in m/s²) of mass m2 to the right?
The acceleration of mass m2 to the right is 3.125 m/s².
Let's denote the compression of the spring by x, the acceleration of m1 by a1 to the left, and the acceleration of m2 by a2 to the right.
According to Newton's second law, the force exerted on an object is equal to its mass times its acceleration:
F = ma. In this case, the forces acting on the two masses are the force of the compressed spring and the force of friction between the masses.
For mass m1, the net force is given by:
F1 = -kx - f
where k is the spring constant, x is the compression of the spring, and f is the force of friction. The negative sign in front of kx indicates that the force of the spring is acting to the left. Using Newton's second law, we have:
m1a1 = -kx - f
For mass m2, the net force is given by:
F2 = kx - f
where the force of the spring is now acting to the right. Using Newton's second law, we have:
m2a2 = kx - f
We want to find the acceleration of mass m2, which is given by a2. To do this, we need to eliminate the force of friction f from the above two equations.
To eliminate f, we can add the two equations:
m1a1 + m2a2 = -kx + kx - 2f
Simplifying and substituting the given values, we get:
(2.5 kg)(2.0 m/s²) + (1.6 kg)a2 = 0
Solving for a2, we get:
a2 = -(2.5 kg)(2.0 m/s²)/(1.6 kg) = -3.125 m/s²
Therefore, the acceleration of mass m2 to the right is 3.125 m/s².
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Sort the following items from most to least inertia.
Answer: In order of most inertia to least.
car stopped
motorcycle driving
dog laying
large hot coffee
small mouse
Explanation:
Honestly, I'm not 100% sure about this, but inertia is the want to remain the way it currently is, So the larger the object, the more inertia it should have. So I basically arranged the things by size, I think the moving and not is a red herring to throw you off. Also given that the dog laying in the middle option makes sense because a dog would be in the middle of the size options.
Two young people are discussing going to a party. They are fully aware that drugs and alcohol will be there, also. The two youngsters rationalize that the party will bring great happiness since it will be the first party allowed since the pandemic shutdown. Every youngster within a 40-mile radius is planning to be there. Youngster-A is starting to consider the consequences of the party and whether it will bring happiness, particularly days later. Youngster-B says that at least it will bring happiness when it happens. Youngster-A responds, yes, but what if parents find out days later? The student continues, what if underage minors are there, the police find out, and the whole thing gets reported back to the school? There could be some terrible results. Besides, Youngster-A says, think back to when you have gone to parties with drugs and alcohol; things never go well. Drugs and alcohol are always harmful at parties. What two (2) moral theories are identified as best for this situation
Answer:
Explanation:
There are several moral theories that could be applicable to this situation, but two that stand out are consequentialism and deontology.
Consequentialism is a moral theory that focuses on the consequences of actions. According to consequentialism, an action is morally right if it leads to the best overall outcome or consequences. In this case, Youngster-A seems to be considering the potential consequences of going to the party, particularly in terms of how it could affect their lives days or weeks later. Youngster-B, on the other hand, seems to be more focused on the immediate pleasure and excitement of attending the party. From a consequentialist perspective, it would be important to consider all of the potential consequences of attending the party before making a decision.
Deontology is a moral theory that emphasizes the duty or obligation to follow certain moral rules or principles. According to deontology, some actions are inherently right or wrong, regardless of their consequences. In this case, there are several moral rules and principles that could be relevant, such as the duty to obey the law, the obligation to avoid harm to oneself or others, and the responsibility to act in a way that aligns with one's values and beliefs. From a deontological perspective, it would be important to consider how attending the party aligns with these moral rules and principles.
Both consequentialism and deontology offer different ways of approaching moral decision-making in this situation. Ultimately, the decision of whether or not to attend the party will depend on the individual's values, beliefs, and priorities, as well as the specific circumstances of the party and potential consequences.
16. The density difference between warm, moist air and cold air causes the moist
air to rise. This is key to forming
A. lightning.
B. clouds.
C. stars.
D. snow.
Warm, moist air rises because of the disparity in density between warm, moist air and cold air. This is crucial for clouds to develop.
What does rising moist, warm air in the atmosphere form?Puffy cumulus clouds can form in the atmosphere as warm, humid air rises in an updraft. As it rises, the moisture in the air condenses into water droplets. As long as warm air rising from below persists, the cloud will expand.
Why do lightning and sound happen?The air in the lightning channel may reach temperatures of 50,000 degrees Fahrenheit, which is five times hotter than the surface of the sun. After the flash, the air swiftly cools and contracts.
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A 7g bullet is fired into a 345g block that is initially at rest at the edge of a frictionless table of height 1.9m. The bullet remains in the block and after impact the block lands 2m from the bottom of the table. Find the initial speed of the bullet. The acceleration due to gravity is 9.8m/s^2. Answer in units of m/s
Answer:
≈ 192.7 m/s
Explanation:
Let's start by finding the velocity of the block just before it hits the ground. We can use the conservation of energy:
The initial potential energy of the block is mgh, where m is the mass of the block, g is the acceleration due to gravity, and h is the height of the table.The final kinetic energy of the block is (1/2)mv^2, where v is the velocity of the block just before it hits the ground.Conservation of energy tells us that these two energies are equal:
mgh = (1/2)mv^2
Solving for v, we get:
v = sqrt(2gh)
Plugging in the given values, we get:
v = sqrt(2 * 9.8 m/s^2 * 1.9 m) = 6.06 m/s
Now, let's use conservation of momentum to find the initial speed of the bullet. We know that the total momentum of the system (bullet + block) is conserved before and after the collision. Before the collision, the momentum is:
p = mb * vb
where mb is the mass of the block and vb is its initial velocity, which is 0 since it is at rest.
After the collision, the bullet and block move together with a common velocity v. The total momentum is:
p = (mb + m) * v
where m is the mass of the bullet. Since momentum is conserved:
mb * vb = (mb + m) * v
Solving for vb, we get:
vb = (mb + m) * v / mb
Plugging in the given values, we get:
vb = (345 g + 7 g) / 7 g * 6.06 m/s = 192.7 m/s
Therefore, the initial speed of the bullet was approximately 192.7 m/s.
Compare the patterns of iron filings to the spiral arms in Interacting galaxies.
The primary locations for the birth of new stars are in galaxies' spiral arms. The proportion of the galaxy that can participate in star formation increases as more gas and dust become available.
What distinguishes the numerous varieties of spiral galaxies?We refer to some spiral galaxies as "barred spirals" because the centre bulge seems extended, like a bar. The spiral arms of the galaxy seem to emerge from the ends of the bar in barred spirals. Elliptical galaxies are round or oval in shape, as their name implies, and have a rather uniform distribution of stars.
The four spiral arms are what?The Norma and Cygnus arm, Sagittarius, Scutum-Crux, and Perseus arms are the four principal spiral arms of the Milky Way.
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4. Radiation safety and protection, including: A. Radiation safety and emergency measures in radiotherapy B. Compliance with local legislative and licensing requirements, code of practice and local rules C. Room shielding design and calculation for radiotherapy equipment and facilities D. Optimization
Radiation safety and protection, including: all the given options.
What is Radiation safety and protection?Radiation safety and protection includes various measures taken to minimize radiation exposure to individuals, the environment, and property.
Some of the key components of radiation safety and protection are:
Radiation safety and emergency measures in radiotherapy: This involves ensuring that appropriate measures are in place to minimize radiation exposure to patients, healthcare workers, and the public during radiotherapy procedures.
Compliance with local legislative and licensing requirements, code of practice and local rules: To ensure radiation safety, there are specific laws, codes of practice, and licensing requirements that must be followed by all organizations and individuals working with radiation.
Room shielding design and calculation for radiotherapy equipment and facilities: Shielding is an essential component of radiation safety and involves designing and constructing radiation-shielded rooms and facilities.
Optimization: Optimization involves using the lowest possible radiation dose necessary to achieve the desired outcome in medical procedures.
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A key challenge with renewable energy is that the energy must be transported to the place where it's needed _ or devices that store the energy needed improvement.
A key challenge with renewable energy is that the energy must be transported to the place where it's needed batteries or devices .
Option A is correct.
What is renewable energy?Renewable energy sources such as solar, wind, and hydroelectric power are often located far away from the areas where the energy is needed. This makes it necessary to transport the energy over long distances, which can be expensive and lead to losses due to transmission and distribution. In addition, renewable energy sources are often intermittent, meaning they don't produce a constant supply of energy.
To address this, energy storage devices are needed to store excess energy produced during peak times for use during times of low energy production. However, the current technology for energy storage is not yet efficient or cost-effective enough to meet the growing demand for renewable energy. Developing more effective energy storage devices is therefore an important area of research and development in the field of renewable energy.
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Question incomplete:
A key challenge with renewable energy is that the energy must be transported to the place where it's needed _ or devices that store the energy needed improvement.
A. batteries
B. refineries
C. solar panels
D. wind turbines
Answer:
batteries
Explanation:
A test rocket starting from rest at point A is launched by accelerating it along a 200.0 m incline at 3.50 m/s2 (Figure 1). The incline rises at 35.0∘ above the horizontal, and at the instant the rocket leaves it, the engines turn off and the rocket is subject to gravity only (ignore air resistance). a)Find the maximum height above the ground that the rocket reaches. b)Find the rocket's greatest horizontal range beyond point A
Answer: a) 123.1m
b) 279.1m
Explanation:
The maximum height reached by the rocket is 0 meters. The rocket's greatest horizontal range beyond point A is also 0 meters.
Explanation:To find the maximum height, we can use the kinematic equation for vertical motion. The rocket starts from rest, so its initial vertical velocity is 0 m/s. We can use the equation:
[tex]h = vi^2 / (2 * g)[/tex]
where h is the maximum height, vi is the initial vertical velocity, and g is the acceleration due to gravity. We can calculate h by substituting the given values:
h = (0 m/s)2 / (2 * 9.8 m/s2)
= 0 m
Therefore, the maximum height reached by the rocket is 0 meters above the ground.
To find the rocket's greatest horizontal range, we can use the horizontal motion equations. Since the rocket is subject to gravity only after leaving the incline, we need to find the time it takes for the rocket to reach the highest point on the incline. We can use the equation:
t = vf / a
where t is the time, vf is the final velocity, and a is the acceleration. We can calculate t by substituting the given values:
t = 3.50/ 3.50
= 1s
Now we can use the equation for horizontal motion to find the horizontal range:
[tex]R = v0 * t[/tex]
where R is the horizontal range and v0 is the initial horizontal velocity. Since the rocket starts from rest, v0 = 0 m/s. Therefore, the rocket's greatest horizontal range beyond point A is 0 meters.
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Your go-cart breaks down right before the end of a race, so you have to push it over the finish line. The go-cart has a mass of 85 kg.
a. What is the weight of your go-cart?
(I need to show my work)
Explanation:
Weight =mass x force of gravity
Weight = 85kg x 9.8m/s²
Weight = 833N
An astronaut floating in space is motionless. The astronaut throws a wrench in one direction, propelling her in the opposite direction. Which of the following statements are true? (Choose all that apply.)
The statement that are true on the astronaut throwing the wrench in space are:
(A) The wrench will have a greater velocity than the astronaut.(C) The wrench will have greater kinetic energy than the astronaut.How would the astronaut be affected ?When the astronaut throws the wrench, the wrench exerts a force on the astronaut, pushing her in the opposite direction. The velocity of the wrench will be greater because it has less mass than the astronaut and therefore can be propelled with greater velocity.
Kinetic energy is proportional to the mass and velocity of an object. Since the wrench has less mass but greater velocity than the astronaut, it will have greater kinetic energy.
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Select which of the following is (are) the correct unit(s) for energy?
Joule (J). This is the fundamental energy unit of the metric system, or the International System of Units in a later, more thorough version (SI).
What does "energy unit" mean?The SI unit of energy, the joule (J), was created in honour of James Prescott Joule and his research on the mechanical equivalent of heat since energy is defined through labour. In terms of SI base units, 1 joule is equivalent to 1-newton metre and, in slightly more basic words.
What is the formula for the energy SI unit?Potential energy, which can be calculated using the formula P.E. = mgh. Unit is the energy that an object has stored due to its position and height. Joules is the SI unit for energy (J).
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if 100g of iron at 100°c is dropped into 390g of water at 20°c what will the final temperature be?
You want to hang a 9.0-kg
sign that advertises your new business. To do this, you use a pivot to attach the base of a 5.0-kg
beam to a wall (Figure 1). You then attach a cable to the beam and to the wall in such a way that the cable and beam are perpendicular to each other. The beam is 1.5 m
long and makes an angle of 37∘
with the vertical. You hang the sign from the end of the beam to which the cable is attached.
A.)What must be the minimum tensile strength of the cable (the minimum amount of tension it can sustain) if it is not to snap?
B.) Determine the horizontal and vertical components of the force exerted by the pivot on the beam.
I have a picture of the system below and I have solved part A to be 68N, but I cannot seem to figure out part B.
Finding unknown responses for statics beam and truss issues can be done by solving for the total of pressures acting in the x- and y-directions. When in balance, the total of the forces acting in each direction on each beam and truss will be equal to zero.
What is a beam in statics?A beam is a long, slender structural component that can support twisting stresses by deforming transverse to its long axis. It should be noted that bending loads are imparted across the long plane.
Steel beams can have cross-sections in a variety of forms, including square, rectangle, circular, I, T, H, C, and tubular.The normal or axial force, the shearing force, and the bending moment are the three potential internal forces that may be generated when a beam or frame is exposed to transverse loadings, as shown in section k of the cantilever.
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