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A 0.500-kg mass hanging from a cuckoo clock is raised 1.00 m. Taking g = 9.80 m/s^2, what is the resulting change in its gravitational potential energy?
A9.80 J
B0.500 J
C4.90 J
D49.0 J
Answer & Solution
Correct answer: C. 4.90 J
1. The change in gravitational potential energy is delta PEg = mgh.
2. Substituting the given values, delta PEg = (0.500 kg)(9.80 m/s^2)(1.00 m).
3. Multiplying these together gives delta PEg = 4.90 J.
4. 9.80 J would result from forgetting the factor of 0.500 kg, 0.500 J is just the mass value itself, and 49.0 J shifts the decimal point by one place.
_Source: OpenStax College Physics (CC BY 4.0), Ch 7 "Work, Energy, and Energy Resources", section 7.3 Gravitational Potential Energy_
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