A large crate with mass m = 12 kg rests on a horizontal loor. The static and kinetic coefficients of friction between the crate and the floor are A = 0.4 and A = 0.3, respectively. A woman pushes downward on the crate at an angle e = 30° below the horizontal with a orce F. What is the magnitude of the force vector F equired to keep the crate moving at constant velocity? Use g = 9.8 m/s?) O a. 59.1 N O b. 49.3 N О с. none of these O d. 24.6 N O e. 98.5 N

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11th Edition
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Chapter1: Units, Trigonometry. And Vectors
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A large crate with mass m = 12 kg rests on a horizontal
floor. The static and kinetic coefficients of friction
between the crate and the floor are s = 0.4 and =
0.3, respectively. A woman pushes downward on the
crate at an angle e = 30° below the horizontal with a
force F. What is the magnitude of the force vector F
required to keep the crate moving at constant velocity?
(Use g = 9.8 m/s?)
F
m
а. 59.1 N
ОБ. 49.3 N
c.
none of these
O d. 24.6 N
О е. 98.5 N
Transcribed Image Text:A large crate with mass m = 12 kg rests on a horizontal floor. The static and kinetic coefficients of friction between the crate and the floor are s = 0.4 and = 0.3, respectively. A woman pushes downward on the crate at an angle e = 30° below the horizontal with a force F. What is the magnitude of the force vector F required to keep the crate moving at constant velocity? (Use g = 9.8 m/s?) F m а. 59.1 N ОБ. 49.3 N c. none of these O d. 24.6 N О е. 98.5 N
A man pulls a crate of 100 N up a frictionless slope with
8= 30° and h = 5 m high as shown. If the crate moves
at constant speed, find the work done by the man.
а. 250 J
O b. - 250 J
О с. - 500 J
O d. OJ
e. 500 J
Transcribed Image Text:A man pulls a crate of 100 N up a frictionless slope with 8= 30° and h = 5 m high as shown. If the crate moves at constant speed, find the work done by the man. а. 250 J O b. - 250 J О с. - 500 J O d. OJ e. 500 J
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