PHY
UTHW12

# UTHW12 - xu(xx638 Homework#12 nevils(77401 This print-out...

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xu (xx638) – Homework #12 – nevils – (77401) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points When a 1 kg baseball is hit, its velocity changes from 21 m / s to - 27 m / s. What is the magnitude of the impulse de- livered by the bat to the ball? Answer in units of N · s. 002 (part 2 of 2) 10.0 points If the baseball is in contact with the bat for 1 . 9 ms, what is the average force exerted by the bat on the ball? Answer in units of kN. 003 (part 1 of 2) 10.0 points The great limestone caverns were formed by dripping water. The acceleration of gravity is 9 . 81 m / s 2 . If water droplets of 0 . 25 mL fall from a height of 10 m at a rate of 20 per minute, what is the average force exerted on the limestone floor by the droplets of water during a 18 min period? Answer in units of N. 004 (part 2 of 2) 10.0 points This force is what multiple of the weight of a water droplet? 005 10.0 points A machine gun fires 33 . 5 g bullets at a speed of 757 m / s. The gun fires 317 bullets / min. What is the average force the shooter must exert to keep the gun from moving? Answer in units of N. 006 10.0 points A(n) 70 kg man, standing erect, steps off a 3 . 5 m high diving platform and begins to fall from rest. The man comes to rest 2 . 5 s after reaching the water. The acceleration of gravity is 9 . 8 m / s 2 . What average force did the water exert on him? Answer in units of N. 007 10.0 points A uranium nucleus 238 U may stay in one piece for billions of years, but sooner or later it de- cays into an α particle of mass 6 . 64 × 10 27 kg and 234 Th nucleus of mass 3 . 88 × 10 25 kg, and the decay process itself is extremely fast (it takes about 10 20 s). Suppose the uranium nucleus was at rest just before the decay.

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