A 7 g bullet is travelling at a speed of 260 m/s towards a 550 g block which lie

Question

A 7 g bullet is travelling at a speed of 260 m/s towards a 550 g block which lies on a horizontal and frictionless surface at the end of a string of length 1.5 m. The bullet's trajectory is tangent to the circle defined by the string. (Figure 1) The bullet goes completely through the block and exits with a speed of one-half its initial speed. http://session.masteringphysics.com/problemAsset/1000184437/7/bullet-mass-circle.jpg What is the velocity of the 550 g block after the bullet exits? After the collision, the 550 g block moves in a circle defined by the string. What is the tension in the string?

Explanation / Answer

mbvbi % mwvwi ! (mb % mw)vf where vf is the common final speed of the bullet and piece of lumber. Because vwi ! 0.0 m/s, vbi ! ! ! 1.2"103 m/s 16. A 35.0-g bullet moving at 475 m/s strikes a 2.5-kg bag of flour that is on ice, at rest. The bullet passes through the bag, as shown in Figure 9-7, and exits it at 275 m/s. How fast is the bag moving when the bullet exits? ¦ Figure 9-7 mBvBi % mFvFi ! mBvBf % mFvFf where vFi ! 0.0 m/s vFf ! vFf ! mB(vBi $ vBf) "" mF (mBvBi $ mBvBf) "" mF 275 m/s (0.0350 kg % 5.0 kg)(8.6 m/s) """" 0.0350 kg (mb % mw)v ""f mb

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