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Secure https:/isession.masteringphysics.com/myctyitemView?assignmentProblem https://session.masteringphysics.com/myct/itemView?assignmentProblem/D-78596110&offset-next; Ch 09 HW Part2 Problem 9.63 Problem 9.63 Part A A 20-kg child wants to slide along a horizontal yard toy that consists of a slick plastic sheet covered with a thin layer of water to reduce friction to almost zero. To cause him to slide, you squirt him with a stream of water from a hose. The water from the hose exerts a constant force of 5.5 N on the child. What is the work done by the water in the interval from t-Otot 1.0s? Express your answer with the appropriate units. w. Value Units Submit My Answers Give Up Part B What is the instantaneous power delivered by the water att 1.0 s? Express your answer with the appropriate units. P- Value Units Submit My Answers Give Up

Explanation / Answer

Solution:

A)

As we know;

W(work done) = F×d

=> W = F×(ut + 1/2×at2) (kinematics equation S = ut+1/2×at2)

=> W = 5.5×(0+ 1/2×(5.5/20)×12)

=> W = 0.75625 J

B)

P(instantaneous power) = F×v

=> P = 5.5×(u+at)

=> P = 5.5×(0+5.5/20×1)

=> P = 1.5125 J/s

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