EGM 3400 and 3401 (circle one) NAME:_______________________ Spring 2007 Quiz 10 Open book/Closed notes – Time limit = 25 minutes The uniform rod OC is 0.5 m long, has a mass of 10 kg, and is initially hanging straight down and at rest. A bullet (initially at A) has a mass of 20 gand a horizontal speed of 700 m/s. After the bullet passes through the rod OC it is at B and now has a speed of 400 m/s in the horizontal direction. Find the largest angle θthat the rod OC makes with the vertical after the bullet passes through the rod. rams Solution: Impulse on bullet: ()0.024007006bulletmmIkgiN s iss⎛⎞=−=−⎜⎟⎝⎠r⋅rrTherefore the angular impulse on the rod about the point O is: ()0.563mjN siN m s k−×⋅=⋅⋅rrr
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