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Exam2_2009

Exam2_2009 - PHYSICS 111 EXAM 2 FALL 2009 19 On the ISU...

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PHYSICS 111 EXAM 2 FALL 2009 19. On the ISU golf course you drive the 42 gram golf ball with a force of 1.2 kN and in the process give it a speed of 58 m/s. How long is the golf club in contact with the ball? ~ .. (a) 1.0x1 0- 3 s ~ 2.0x1 0-3~ (c) 3.0x1 0- 3 s (d) 4.0x1 0- 3 s (e) 5.0x10- 3 s 20. A bullet with a mass of 4.6 grams is fired horizontally and stops inside a 1.3 kg wooden block resting on a frictionless surface. The block recoils with a speed of 17 m/s. What is the speed of the bullet just before it hits the wooden block? A student applies a force of 25.0 N as shown in the figure to the right to drag a 50.0 kg box at constant speed a distance of 35.0 m in 1.00 minute? 21. How much work does the student do on the box. 22. What power must the student generate in order to move the box? Hint: You can use answer from problem 21 but not necessary for problem 22. G):13.-®(b) 14.6 W (c) 46.2 W (d) 283 W (e) 822 W

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23. A 4.6 kg box is at rest on top of a hill as shown in the figure to the right. It slides to the bottom and compresses a large spring whose force constant is 4.2x10 3 Nm. How much is the spring compressed?
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