...oo AT&T; LTE 11:16 AM T 80% session masteringphysics.com Exercise 6.3 Masteri
ID: 1626498 • Letter: #
Question
...oo AT&T; LTE 11:16 AM T 80% session masteringphysics.com Exercise 6.3 Mastering Physics A factory worker pushes a crate of mass 28.2 kg a distance of 4.10 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and floor is 0.26 Part A What magnitude of force must the worker apply? Express your answer using two significant figures. Give Up Submit Part B How much work is done on the crate by this force? Express your answer using two significant figures. Give Up Submit Part C How much work is done on the crate by friction? Express your answer using two significant figures.Explanation / Answer
here,
m = 28.2 kg
s = 4.1 m
uk = 0.26
a)
the magnitude of force applied for constant velocity , F = uk * m* g
F = 0.26 * 28.2 * 9.8 N
F = 71.9 N
b)
the work done by this force , W = F * s
W = 294.6 J
c)
the work done by the frictional force , Wff = - W = - 294.6 J
d)
the work done by the normal force , Wn = N * s * cos(90) = 0 J
e)
the work done by gravity , Wg = m * g * s * cos(90) = 0 J
f)
as the crate is moving with constant speed
the net force on it is zero
so the net work done on the crate is 0 J
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