P: A 250 g stone is lifted to 10 m on the Earth. |
Q: A 800 g stone is lifted to 2 m on Saturn. |
R: A 1kg stone is lifted to 1 m on Jupiter. |
A) More energy is required to lift stone \[Q\] than stone\[P\].
B) More energy is required to lift stone \[P\] than stone\[R\].
C) Stone \[P\] and stone \[Q\] require the same amount of energy.
D) Stone \[P\] and stone \[R\] require the same amount of energy.
Correct Answer: D
Solution :
Work done in all the \[3\] cases\[=mgh\] Work done by\[P=mgh\] \[=0.25\times 10\times 10=25\,\,J\] Work done by\[Q=mgh=0.8\times 15\times 2=24\,\,J\] Work done by\[R=mgh=1\times 25\times 1=25\,\,J\]You need to login to perform this action.
You will be redirected in
3 sec