What is the potential energy of the book relative to the ground? Answer: 51.8 Wh

Question

What is the potential energy of the book relative to the ground? Answer: 51.8 What is the potential energy of the book relative to the top of the person's head? Answer: 16 Part C How is the work done by the person related to the answers in parts A and B?          A 1.60-m m tall person lifts a 2.30-kg kg book from the ground so it is 2.30 m m above the ground. What is the potential energy of the book relative to the ground? Answer: 51.8 What is the potential energy of the book relative to the top of the person's head? Answer: 16 I do not know. How is the work done by the person related to the answers in parts A and B? Express your answer in terms of some or all of the variables PE(grav1) PEgrav1, PEgrav2?PEgragrPE(grPEgrav2

Explanation / Answer

Part A)

PE = mgh = (2.3)(9.8)(2.3) = 51.8 J

Part B)
PE = (2.3)(9.8)(2.3 - 1.6) = 15.8 J

Part C)

PEgrav1 = 51.8 J

PEgrav2 = 15.8 J

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