Homework 3 – 4

4

A ballistic pendulum is formed by a wood block of mass M = 2:00 kg hung from the ceiling by a long cord

of length L = 1:00 m. A bullet of mass 10:0 g is red into the block and embeds in the block. The block

rises a height of h = 5:00 cm.

(a) Draw a gure showing the initial and nal positions of the block.

(b) What was the speed of the bullet ?

(c) How much thermal energy is generated in the block?

(d) If the bullet stops in a distance of 4.00 cm inside the block, estimate the force of friction.

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