A - 370 kg piano slides 2.7 m down a 28 incline and is kept from accelerating by
ID: 1537791 • Letter: A
Question
A- 370 kg piano slides 2.7 m down a 28 incline and is kept from accelerating by a man who is pushing back on it parallel to the incline . Ignore friction.
1- Determine the force exerted by the man.
2- Determine the work done on the piano by the man.
3- Determine the work done on the piano by the force of gravity.
4- Determine the net work done on the piano.
B- Two bullets are fired at the same time with the same kinetic energy.
1- If one bullet has twice the mass of the other, what is the ratio of the speed of the lighter bullet to the speed of the heavier?
2-Which can do the most work?
Both bullets can do the same amount of work.
C-If the speed of a car is increased by 75%, by what factor will its minimum braking distance be increased, assuming all else is the same? Ignore the driver's reaction time.
D- A 75.5-kg hiker starts at an elevation of 1300 m and climbs to the top of a peak 2570 m high.
1- What is the hiker's change in potential energy?
2- What is the minimum work required of the hiker?
3-Can the actual work done be greater than this?
E-A 1.80-m tall person lifts a 1.70-kg book from the ground so it is 2.30 m above the ground.
1-What is the potential energy of the book relative to the ground?
2- What is the potential energy of the book relative to the top of the person's head?
3-How is the work done by the person related to the answers in parts 1 and 2?
The work done by the person in lifting the book from the ground to the final height is the same as the answer to part 2
F- For an elastic collision, which of the following statements are true?
Momentum is conserved.
G- For an INELASTIC collision, which of the following statements are true?
H- A small boat coasts at constant speed under a bridge. A heavy sack of sand is dropped from the bridge onto the boat. The speed
I- A small car and a heavy pickup truck are both out of gas. The truck has twice the mass of the car.
After you push both the car and the truck for the same amount of time with the same force, what can you say about the momentum and kinetic energy (KE) of the car and the truck? Ignore friction.
The truck has more momentum and more KE than the car.
M- A small car and a heavy pickup truck are both out of gas. The truck has twice the mass of the car.
After you push both the car and the truck for the same distance with the same force, what can you say about the momentum and kinetic energy (KE) of the car and the truck? Ignore friction.
The heavy bullet can do the most work. The lighter bullet can do the most work.Both bullets can do the same amount of work.
C-If the speed of a car is increased by 75%, by what factor will its minimum braking distance be increased, assuming all else is the same? Ignore the driver's reaction time.
D- A 75.5-kg hiker starts at an elevation of 1300 m and climbs to the top of a peak 2570 m high.
1- What is the hiker's change in potential energy?
2- What is the minimum work required of the hiker?
3-Can the actual work done be greater than this?
E-A 1.80-m tall person lifts a 1.70-kg book from the ground so it is 2.30 m above the ground.
1-What is the potential energy of the book relative to the ground?
2- What is the potential energy of the book relative to the top of the person's head?
3-How is the work done by the person related to the answers in parts 1 and 2?
The work done by the person in lifting the book from the ground to the final height is the same as the answer to part 1The work done by the person in lifting the book from the ground to the final height is the same as the answer to part 2
F- For an elastic collision, which of the following statements are true?
Kinetic energy is conserved. Momentum is gained. Kinetic energy is lost. Kinetic energy is gained. Momentum is lost.Momentum is conserved.
G- For an INELASTIC collision, which of the following statements are true?
Momentum is conserved. Momentum is gained. Kinetic energy is lost. Momentum is lost. Kinetic energy is conserved.H- A small boat coasts at constant speed under a bridge. A heavy sack of sand is dropped from the bridge onto the boat. The speed
increases. decreases. does not change. Without knowing the mass of the boat and the sand, we can't tell.I- A small car and a heavy pickup truck are both out of gas. The truck has twice the mass of the car.
After you push both the car and the truck for the same amount of time with the same force, what can you say about the momentum and kinetic energy (KE) of the car and the truck? Ignore friction.
They have the same momentum and the same KE. They have the same kinetic energy, but the truck has more momentum than the car. The car has more momentum and more KE than the truck. They have the same momentum, but the car has more kinetic energy than the truck.The truck has more momentum and more KE than the car.
M- A small car and a heavy pickup truck are both out of gas. The truck has twice the mass of the car.
After you push both the car and the truck for the same distance with the same force, what can you say about the momentum and kinetic energy (KE) of the car and the truck? Ignore friction.
The truck has more momentum and more KE than the car. They have the same momentum and the same KE. They have the same kinetic energy, but the truck has more momentum than the car. They have the same momentum, but the car has more kinetic energy than the truck. The car has more momentum and more KE than the truck.Explanation / Answer
A)
Given Data
mass, m = 370 kg
d = 2.7 m
angle theta = 28
Solution:-
1) the force exerted by the man is
F = m*g*sin theta
F = 370*9.8*sin 28
= 1702.3 N
2- the work done on the piano by the man.
W = - F*d
= - 1702.3*2.7
= - 4596.2 J
3- the work done on the piano by the force of gravity.
Wg = - W
= 4596.2 J
4- The net work done on the piano.
The net work done is zero as applied force = downward force
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