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Spring 2004

# Spring 2004 - Scott Pratt PHY 231 Spring 2004 midterm2 1...

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Scott Pratt - PHY 231 - Spring 2004 1 midterm2 1 pt A drunk driver strikes a parked car. During the colli- sion the cars become entangled and skip to a stop together. Each car has a total mass of 910 kg. If the cars slide 16.5 m before coming to rest, how fast was the drunk driver going? The coefficient of sliding friction between the tires and the road is 0.35. (in m/s ) 1 . A 2.892 B 3.846 C 5.116 D 6.804 E 9.049 F 12.035 G 16.007 H 21.289 1 pt A baseball has a mass of about 0.17 kg, and it is pitched towards home plate at a speed of about 37 m/s. If the bat exerts an average force of 7300 N for 1.9 ms, what is the final speed of the ball in m/s? (in m/s ) 2 . A 25.21 B 33.52 C 44.59 D 59.30 E 78.87 F 104.90 G 139.52 H 185.56 1 pt Consider the graph of force, F, vs. position, x, shown above. The hashmark on the vertical axis denotes a value F 0 =30 N. Find the velocity of a 7.7-kg object as it moves from x = 0.0 to x = 15.0 m after starting at rest. (in m/s ) 3 . A 2.82 B 3.75 C 4.99 D 6.64 E 8.83 F 11.74 G 15.61 H 20.77 1 pt The launching mechanism of a toy gun consists of a spring whose spring constant is 6942 N/m. The spring is compressed a distance 3.1 cm before launching. What is the maximum height to which the gun can launch a 20-g projec- tile?

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