Question

6.A motor pulls an 800 kg roller coaster train to the top of a 75 m hill. What is the change in the potential energy of the cars?
A.5.9 x 10 ⁵ J
B.6.0 x 10 ⁴ J
C.18 x 10 ⁴ J
D.7.5 x 10 ⁵ J

7.Friction converts kinetic energy to which form?
A.potential energy
B.mechanical energy
C.non mechanical energy
D.total energy

8.How much power does a crane need to lift a 200.0 kg mass at a speed of 2.300 m/s?
A. 460W
B. 1962W
C. 4513W
D. 6123W

9.If a 50.0 kg cheetah, initially at rest, runs 274 m north in 8.65 s, what is its momentum?
A.31.7 kg m/s
B.1584 kg m/s
C.490.5 kg m/s
D.118,500 kg m/s

10.What is the kinetic energy of a 0.005 kg raindrop that falls 250 m?
A.4.9J
B.1.25J
C.8.3J
D.5.6J

Answer 1

6 -b
7-d
8-a
9-d
10-c

hope this helps:)