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Question1
An old oaken buck of mass 6.75 kg hangs in a well at the end of a rope. The rope passes over a frictionless pulley at the top of the well, and you pull horizontally on end of the rope to raise that bucket gradually a distance of 4.00m.
(a) How much work do you do on bucket in pulling it up?
(b) How much work does gravity do on bucket?
(c) What is total work done on the bucket?
Question2
A 6.7 g bullet is fired into a 1.3 kg ballistic pendulum. The bullet come out from block with a speed of 137 m/s, and block rises to a greatest height of 10 cm.
find out an initial speed of the bullet. The acceleration due to gravity is 9.8 m/s2.
Answer should be in units of m/s
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A dockworker applies a constant horizontal force of 84.0\({\rm N}\) to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 12.5\({\rm m}\) in a time 4.80\({\rm s}\)
Status Newton's First Law of motion.
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