Question

1.

Aoife is pushing on a large box, which has a mass of 15 kg. The large box, in turn, pushes against a smaller box, which has a mass of 5 kg. Aoife pushes with a force of 160 N. The bottoms of the boxes are perfectly frictionless, but Aoife's shoes don't slip on the ground at all. Find the contact force between the boxes.

2.

Aoife gets in an elevator with the two boxes from the first
question stacked on top of each other (total mass = 20 kg). The
elevator begins accelerating downward, then travels at a constant
speed for some time, then slows to a stop at the ground floor. If
the rate of acceleration of the elevator is 2 m/s^{2} for
both the speeding up and slowing down portions, find the apparent
weight of the boxes at each point during this trip.

Answer #1

A man of 75 kg is pushing a heavy box along flat floor. The
coefficient of sliding friction between the floor and the box is
0.20, and the coefficient of static friction between the man's
shoes and the floor is 0.80.
(a) If the man pushes downward on the box at an angle of 30
degrees, what is the maximum mass of the box he can move?
(b)If the man pushes upward on the box at an angle of 30...

At an Amazon shipping center, a box of cups of mass 2.6 kg rests
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μs=0.45μs=0.45.
What is the maximum horizontal force that can be applied to the
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a large box whose mass is 20.0 kg rests on the frictionless
floor. A mover pushes on the box with a force of 250 N at an angle
35.0 below the horizontal. Draw the box's free body diagram and
calculate the acceleration of the box
b) if the kinetic friction coefficient is 0.1 between the box
and floor. Draw the box's free body diagram and re-calculate the
acceleration of the box

Description:
A single mass m1 = 3.9 kg hangs from a spring in a
motionless elevator. The spring is extended x = 11 cm from its
unstretched length.
the spring constant of the spring is 347.45 N/m
Now, three masses m1 = 3.9 kg, m2 = 11.7
kg and m3 = 7.8 kg hang from three identical springs in
a motionless elevator. The springs all have the same spring
constant that you just calculated above.
the force the top spring...

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A friend has given you a special gift, a box of mass 10.0 kg
with a mystery surprise inside. The box is resting on the smooth
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a. determine the weight of the box and the normal force exerted
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b. now your friend pushes down on the box with a force of 40.0
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A child pushes her friend (m = 25 kg) located at a radius r =
1.5 m on a merry-go-round (rmgr = 2.0 m, Imgr
= 1000 kg*m2) with a constant force F = 90 N applied
tangentially to the edge of the merry-go-round (i.e., the force is
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