Physics Review Question Unit: Work and Energy Year: 1993 Question#: 12 Question: A 0.10-kilogram ball dropped vertically from a height of 1.0 meter above the floor bounces back to a height of 0.80 meter. The mechanical energy lost by the ball as it bounces is approximately (1 ) 0.080 J (2 ) 0.20 J (3 ) 0.30 J (4 ) 0.478 J What is this question really asking? Explanation by: Jay D [ Return to question menu ] Answer 1 0.080 J INCORRECT The formula that you need to use is PE=mgh return to top Answer 2 0.20 J CORRECT The formula that you need to use is PE=mgh PE=(0.10kg)(9.8m/s2)(0.20m) The mechanical energy lost is 0.20 J return to top Answer 3 0.30 J INCORRECT The formula that you need to use is PE=mgh return to top Answer 4 0.78 J INCORRECT The formula that you need to use is PE=mgh return to top What's this question really asking? If a ball was dropped from a certain height how much mechanical energy was lost. return to top |
[Home] [Lessons] [Review] [Search] [Links]
This web site is designed and maintained by Science Joy Wagon and may
not be reproduced or redistributed without written permission from Science Joy Wagon. |