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November 22, 2014

Homework Help: physics

Posted by dave on Thursday, September 2, 2010 at 11:33am.

at on time, the velocity of a rifle bullet was measured using a ballistic pendulum made up of a wooden block suspended from a string. the block used here has a mass of 20kg. a 50g rifle bullet is fired into the block, penetrating it by 10cm and causing it to swing upwards, increasing its height by 20cm.

a) calculate the velocity of the bullet as it enters the wooden block. Express you answer in km/h.

b) calculate the frictional force between the bullet and the wooden block.

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