Asked by roxy
An object has a gravitational potential energy of 24 joules when it rests on a shelf 3 m above the ground. What would be its gravitational potential energy when it is lowered to a shelf 1 m above the ground?
o A. 8 joules
o B. 12 joules
o C. 22 joules
o D. 72 joules
o A. 8 joules
o B. 12 joules
o C. 22 joules
o D. 72 joules
Answers
Answered by
James
PE = mgh
Therefore m = PE/(g x h)
m = 24/(9.8 x 3)
m = 0.82kg
Now the object is moved to 1m above the ground.
PE = mgh
PE = 0.82 x 9.8 x 1
PE = 8.036
Round off to 8 (A)
Alternatively, you could divide 24J by 3, as this is the change in height difference. But you may be marked down if proper work is not shown.
Therefore m = PE/(g x h)
m = 24/(9.8 x 3)
m = 0.82kg
Now the object is moved to 1m above the ground.
PE = mgh
PE = 0.82 x 9.8 x 1
PE = 8.036
Round off to 8 (A)
Alternatively, you could divide 24J by 3, as this is the change in height difference. But you may be marked down if proper work is not shown.
There are no AI answers yet. The ability to request AI answers is coming soon!