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Q 1/9
Score 0
The brakes on a car do 280,000 J of work in stopping the car. If the car travels a distance of 70 m while the brakes are being applied, how large is the force that the brakes exert on the car? W=Fd
30
3500 J
4000 J
.025 J
500 J
Q 2/9
Score 0
Calculate the kinetic energy of a 678 kg cheetah running after an antelope at 9 m/s.
30
27,459 J
6,102 J
21,102 J
3,051 J
9 questions
Q.
The brakes on a car do 280,000 J of work in stopping the car. If the car travels a distance of 70 m while the brakes are being applied, how large is the force that the brakes exert on the car? W=Fd
1
30 sec
Q.
Calculate the kinetic energy of a 678 kg cheetah running after an antelope at 9 m/s.
2
30 sec
Q.
A jogger is moving with a mass of 37 kg at a speed of 4 m/s. What is the jogger's kinetic energy?
3
30 sec
Q.
What happens to the energy of the ball as it rolls from point D to point E
4
30 sec
Q.
At what position does the ball have the greatest kinetic energy?
5
30 sec
Q.
A 7 kg history book is placed on a 1.95 m high table. How large is the gravitational potential energy of the book relative to the floor?
6
30 sec
Q.
The input work on a pulley system is 70 J. If the output work is 39 J, what is the efficiency of the pulley system? e=Work (out)/Work (in)
7
30 sec
Q.
Energy cannot be created or destroyed it only _________________
8
30 sec
Q.
The stored energy due to the chemical bonds between atoms is ____ energy.
