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Reinforcement Question
Chapter 4: Static Equilibrium
1.
If the torque required loosing a nut that is holding a flat tire in place on a car has a
magnitude of 40.0Nm, what minimum force must be exerted by the mechanic at
the end of a 30.0cm lug wrench to accomplish the task?
2.
A steel band exerts horizontal force of 80N on a tooth at point B in Figure below.
What is the torque on the root of the tooth about point A?
0.300 m
Pivot
F
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3.
A fishing pole is 2 m long and inclined to the horizontal at an angle of 20o. What
is the torque exerted by the fish about an axis perpendicular to the page and
passing through the hand the person holding the pole?
4.
A 5.0 meterlong ladder leans against a wall at a point 4.0 meters above the
ground. The ladder is uniform and has a mass of 12.0 kg. Assuming that the wall
is frictionless (but the ground is not),
a ) find the forces exerted on the ladder by the ground and the wall.
b ) If the coefficient of friction between the ladder and the ground is
μ
= 0.40,
how high up the ladder can a 58kg painter climb without the ladder slipping?
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 Spring '09
 none
 Force, meterlong ladder, steel band exerts, 58kg painter climb

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