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  21. A 7.00-kg bowling ball falls from a 2.00-m shelf.

Question :   21. A 7.00-kg bowling ball falls from a 2.00-m shelf. : 2102119

 

21. A 7.00-kg bowling ball falls from a 2.00-m shelf. Just before hitting the floor, what will be its kinetic energy? (g = 9.80 m/s2 and assume air resistance is negligible)

A. 14.0 J

B. 19.6 J

C. 29.4 J

D. 137 J

22. A rock is thrown straight up with an initial velocity of 15.0 m/s. Ignore energy lost to air friction. How high will the rock rise?

A. 1.53 m

B. 22.9 m

C. 6.50 m

D. 11.5 m

23. What is the minimum amount of energy required for an 80-kg climber carrying a 20-kg pack to climb Mt. Everest, 8 850 m high?

A. 8.67 MJ

B. 4.16 MJ

C. 2.47 MJ

D. 1.00 MJ

24. A professional skier reaches a speed of 56 m/s on a 30? ski slope. Ignoring friction, what was the minimum distance along the slope the skier would have had to travel, starting from rest?

A. 110 m

B. 160 m

C. 320 m

D. 640 m

25. As an object is lowered into a deep hole in the surface of the earth, which of the following must be assumed in regard to its potential energy?

A. increase

B. decrease

C. remain constant

D. cannot tell from the information given

 

Solution
5 (1 Ratings )

Solved
Physics 1 Year Ago 115 Views
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