HELP! can anyone explain me how to get them right? A steel ball of mass m1 = 1.2
ID: 1292495 • Letter: H
Question
HELP! can anyone explain me how to get them right?
A steel ball of mass m1 = 1.2 kg and a cord of length of L = 1.9 m of negligible mass make up a simple pendulum that can pivot without friction about the point O, as in the figure below. This pendulum is released from rest in a horizontal position, and when the ball is at its lowest point it strikes a block of mass m2 = 1.2 kg sitting at rest on a shelf. Assume that the collision is perfectly elastic and that the coefficient of kinetic friction between the block and shelf is 0.10.
(A) What is the velocity of the block just after impact?
(b) How far does the block slide before coming to rest (assuming that the shelf is long enough)?
Tarzan is in the path of a pack of stampeding elephants when Jane swings in to the rescue on a rope vine, hauling him off to safety. The length of the vine is 23 m, and Jane starts her swing with the rope horizontal. If Jane's mass is 52 kg, and Tarzan's mass is 83 kg, to what height above the ground will the pair swing after she rescues him? (Assume the rope is vertical when she grabs him.)
Explanation / Answer
1
(a) The speed of the ball at its lowest point is:
0.5mv
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