Physics Review Question

Unit: Potential energy
Year: 1989 Question#: 23
Question: An object gains 10 joules of potential energy as it is lifted vertically 2.0 meters. If a second object with one-half the mass is lifted vertically 2.0 meters, the potential evergy gained by the second object will be

(1 ) 10. J
(2 ) 20. J
(3 ) 5.0 J
(4 ) 2.5 J

What is this question really asking?




Explanation by: Chris B.

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Answer 1
10. J

INCORRECT

Dealing wiht this question you must first plug information into the potential energy formula. PE=mgh, and take these steps. (2m)(10m/s2)(m)=10J mass is equal to 0.5kg, but this is just the first part. The second object is decreased by half =0.25Kg. Plug that into the equation GPE = mgh return to top























Answer 2
20J

INCORRECT

Dealing wiht this question you must first plug information into the potential energy formula. PE=mgh, and take these steps. (2m)(10m/s2)(m)=10J mass is equal to 0.5kg, but this is just the first part. The second object is decreased by half =0.25Kg. Plug that into the equation GPE = mgh return to top



























Answer 3
5.0 J

CORRECT

Dealing wiht this question you must first plug information into the potential energy formula. PE=mgh, and take these steps. (2m)(10m/s2)(m)=10J mass is equal to 0.5kg, but this is just the first part. The second object is decreased by half =0.25Kg. Plug that into the equation GPE = mgh.
Depleting the mass by half has a direct relationship with the answer. return to top


























Answer 4
2.5

INCORRECT

Dealing wiht this question you must first plug information into the potential energy formula. PE=mgh, and take these steps. (2m)(10m/s2)(m)=10J mass is equal to 0.5kg, but this is just the first part. The second object is decreased by half =0.25Kg. Plug that into the equation GPE = mgh return to top


























What's this question really asking?

How is mass related to gravitational potential energy? return to top

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