D www.google.com Mastering Physics: PS-1-Advanced Google Chrome C O op Secure ht

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D www.google.com Mastering Physics: PS-1-Advanced Google Chrome C O op Secure https://session.masteringphysics.com assignment ProblemID 63 /myct/itemView? PHYS1052 General Physics II es-1-Advanced Problem 16.28 Mastering Phy G My Courses Problem 16.28 Part A Course Home During a workout, a person repeatedly lifts a 13-lb How many "reps" of this lift are required to burn off 160 C barbell through a distance of 1.5 ft Syllabus Express your answer using two significant figures. Assignments Scores repetitions Course Tools eText Submit My Answers Give Up Study Area User Settings Ask me anything previous l 3 of 12 l next NS Continue Provide Feedback 948 PM 9/2017

Explanation / Answer

w = 13 lb = 5.89 kg

d = 1.5 ft = 0.46 m

E = 160 C = 669440

We know that the energy required for one lift would be:

PE = 5.89 x 0.46 x 9.8 = 26.55 J

So, number of lifts would be then:

N = E/PE = 669440/26.55 = 25214.32 lifts

Hence, N = 25214 Lifts.

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