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P1: Quiz 4
P1: Quiz 4
1) What is the formula for calculating the change in energy in the gravitational potential energy store of an object? Write the units for all of the values as well.
2) A 20 kg bag of cement currently sits on the ground floor of a building. A crane lifts the bag of cement 16 metres up to the fourth floor of a building. Calculate the change in energy in the bag of cement’s gravitational potential energy store.
Use g as 9.8 N/kg.
3) A tennis ball is dropped off of the second floor of a building that is 8.2 metres above the ground. The tennis ball has a mass of 59 grams. Find the loss of energy in the tennis ball’s gravitational potential energy store. Give your answer to 2 significant figures.
Use g as 9.8 N/kg.
4) A tablet is lifted from the floor to a table that is 1.2 metres above the floor. The energy in the tablet’s gravitational potential energy store increases by 3.528 J. Find the mass of the tablet. Give your answer in grams.
5) A crane lifts a 38 kg window from the ground floor to the 14th floor of a building. The crane transfers 11,991.28 joules of energy to the window’s gravitational potential energy stores. Find the height that the window is lifted.
Use g as 9.8 N/kg.
The following questions will use formulas that we have learnt in the previous sections.
6) An object that has a mass of 3 kg falls from a height of 26 metres.
Use g as 9.8 N/kg and assume that there is no air resistance.
a) Find the loss in gravitational potential energy.
b) Find the gain in kinetic energy.
c) Find the velocity that the object is travelling at after it has fallen by 26 metres. Give your answer to 3 significant figures.
7) An object has a mass of 700 grams. It falls off a building and hits the floor. Just before it hits the floor, the object has a velocity of 6 m/s. Find the height that the object fell. Give your answer to 3 significant figures.
Use g as 9.8 N/kg.
8) A student uses a spring to fire a ball that has a mass of 30 grams into the air. The spring that they use has a spring constant of 80 N/m and the student compresses the spring by 0.15 metres.
For the following questions, assume that the energy is transferred between stores fully and that there is no air resistance. Also, use g as 9.8 N/kg.
a) Work out the velocity of the ball as soon as it is fired. Give your answer to 2 significant figures.
b) Work out the maximum height that the ball reaches. Give your answer to 2 significant figures.
2) A 20 kg bag of cement currently sits on the ground floor of a building. A crane lifts the bag of cement 16 metres up to the fourth floor of a building. Calculate the change in energy in the bag of cement’s gravitational potential energy store.
Use g as 9.8 N/kg.
3) A tennis ball is dropped off of the second floor of a building that is 8.2 metres above the ground. The tennis ball has a mass of 59 grams. Find the loss of energy in the tennis ball’s gravitational potential energy store. Give your answer to 2 significant figures.
Use g as 9.8 N/kg.
4) A tablet is lifted from the floor to a table that is 1.2 metres above the floor. The energy in the tablet’s gravitational potential energy store increases by 3.528 J. Find the mass of the tablet. Give your answer in grams.
5) A crane lifts a 38 kg window from the ground floor to the 14th floor of a building. The crane transfers 11,991.28 joules of energy to the window’s gravitational potential energy stores. Find the height that the window is lifted.
Use g as 9.8 N/kg.
The following questions will use formulas that we have learnt in the previous sections.
6) An object that has a mass of 3 kg falls from a height of 26 metres.
Use g as 9.8 N/kg and assume that there is no air resistance.
a) Find the loss in gravitational potential energy.
b) Find the gain in kinetic energy.
c) Find the velocity that the object is travelling at after it has fallen by 26 metres. Give your answer to 3 significant figures.
7) An object has a mass of 700 grams. It falls off a building and hits the floor. Just before it hits the floor, the object has a velocity of 6 m/s. Find the height that the object fell. Give your answer to 3 significant figures.
Use g as 9.8 N/kg.
8) A student uses a spring to fire a ball that has a mass of 30 grams into the air. The spring that they use has a spring constant of 80 N/m and the student compresses the spring by 0.15 metres.
For the following questions, assume that the energy is transferred between stores fully and that there is no air resistance. Also, use g as 9.8 N/kg.
a) Work out the velocity of the ball as soon as it is fired. Give your answer to 2 significant figures.
b) Work out the maximum height that the ball reaches. Give your answer to 2 significant figures.