Asked by roxy
An object of mass 1.5 kg rests on a shelf where it has a gravitational potential energy of 7 joules. An object of mass 4.5 kg is placed on the same shelf. What is the gravitational potential energy of this second object?
Answers
Answered by
bobpursley
Isn't GPE directly proportional to mass?
So what if mass is tripled?
So what if mass is tripled?
Answered by
James
PE = mgh
Therefore H = PE/(mxg)
H = 7/(1.5 x 9.8)
H = 0.48m
PE (object 2) = 4.5 x 9.8 x 0.48
PE (object 2) = 21.17J
Therefore H = PE/(mxg)
H = 7/(1.5 x 9.8)
H = 0.48m
PE (object 2) = 4.5 x 9.8 x 0.48
PE (object 2) = 21.17J
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