What is the potential energy, in joules, of a 7.0 kg bowling ball that is 150 cm above the ground?
A. 103 J
B. 10,300 J
C. 10.5 J
D. 2415 J
E. Insufficient information to solve
A. Correct. This is the P.E. of the bowling ball “system”.
B. Incorrect. Check the units on your variables; you have not taken prefixes (centi-, milli-, …) into account.
C. Incorrect. You have left out the acceleration of gravity from Equation 1.30. Try again.
D. Incorrect. You appear to have made multiple mistakes. Go back to Section 1.4.5 and review the subject. Then start from the equation provided that quantifies P.E. and redo the problem.
E. Incorrect. The problem can be solved. The only assumption required is a value for the acceleration due to gravity, and this is uniform enough on Earth that a single value is used routinely.
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