# a 5 - p 2 2 m . Show now that if two objects have the same...

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PHYSICS 309K, FALL 2004 HOMEWORK #5, Due Wednesday October 13, 2004 1. This question is typical on some driver’s license exams: A car moving 50 km/h skids 15 m with locked brakes. How far will the car skid with locked brakes at 150 km/h? 2. In the hydraulic machine shown, it is observed that when the small piston is pushed down 10 cm, the large piston is raised 1 cm. If the small piston is pushed down with a force of 100 N, what is the most force that the large piston could exert? ? 3. A 60-kg skydiver moving at terminal speed falls 50 m in 1 s. What power is the skydiver expending on the air? 4. Using the de±nitions of momentum and kinetic energy, p = mv , show that KE =
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Unformatted text preview: p 2 2 m . Show now that if two objects have the same momentum, the one of less mass has the greater kinetic energy. 5. A golf ball is hurled at and bounces from a very massive bowling ball that is initially at rest. (a) After the collision, which of the two balls has the greater momentum? (Hint: The golf ball has practically the same speed before and after bouncing and therefore practically the same magnitude of momentum after it rebounds. How great will be the momentum of the larger ball in order that the total momentum before and after the collision is the same?) (b) Which ball will have the greater KE after the collision? .. . .....
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## This note was uploaded on 02/13/2010 for the course PHY 303L taught by Professor Turner during the Spring '08 term at University of Texas at Austin.

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