(3%) Problem 26: It takes a student t = 7.1 s to push a block m 21 kg at a const
ID: 1785444 • Letter: #
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(3%) Problem 26: It takes a student t = 7.1 s to push a block m 21 kg at a constant velocity over a distance of d = 4.8 m. The coefficient of friction between the block and the ground is = 0.46 33% Part (a) Write g ! expression using the variables provided for the force applied by the student F, Grade Summary 0% 100% Potential Submissions Attempts remaining: 7 (29% per attempt) detailed view 0 END DEL CLEAR Submit I give up! Hints: 0% deduction per hint. Hints remaining: 3 Feedback: 0%-deduction per feedback. D 33% Part (b) Write an expression for the energy required for the work done by the student in moving the block along this path in terms of the variables provided 33% Part (c) How much power, in Watts, was applied to the block by the student?Explanation / Answer
a) fs = mue*N
N = mg
fs = mue*mg
b) wf = -fs*d
w = -0.46*21*9.8*4.8 = -454.4 J
c) power p = w/t = -454.4/7.1 = 64 W
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