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A ladder with a length of 5.0 m and a weight of 450 N is placed so its base is on the ground 4.0 m from a vertical frictionless wall, and its tip rests 3.0 m up the wall. The ladder remains in this position only because of the static friction force between the ladder and the ground. You, with a weight of 500 N, are standing on the ladder at a horizontal distance of 2.60 m from the wall. Assume the mass of the ladder is uniformly distributed.
(a) Find the magnitude of the upward normal force applied by the ground on the ladder.
(b) Find the magnitude of the horizontal normal force applied by the wall on the ladder.
(c) Determine the minimum possible coefficient of static friction for the ladder-ground interaction, for the ladder to remain at rest.
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A child on a freely rotating merry-go-round moves from near the center to the edge. Will the rotational velocity of the merry-go-round increase, decrease, or not change at all? Explain.
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A crate of mass 10.6 kg is pulled up a rough incline with an initial speed of 1.54 m/s. The pulling force is 108 N parallel to the incline, What is the change in kinetic energy of the crate
For safety in climbing, a mountaineer uses a nylon rope that is 60 m long and 1.0 cm in diameter. Find its Young's modulus
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