Physics Exam 2

Physics Exam 2 - 1. 4.0 J of work are performed in...

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1. 4.0 J of work are performed in stretching a spring with a spring constant of 2500N/m. How much is the spring stretched? a. 3.2 cm b. 3.2 m c. 0.3 cm d. 5.7 m e. 5.7 cm 2. A 20-N horizontal force pushes an object along a rough floor so that the object moves with a constant velocity of 6.0 m/s. How much power does this force deliver to the object? a. 5.0 W b. 20 W c. 160 W d. 0 W e. 120 W 3. An 8 kg object moving with an initial velocity of 4 m/s comes to rest due to friction after it travels a horizontal distance of 10 m. If the initial speed of the object is doubled, what distance will it travel before coming to rest? Use g = 10m/ s2 a. 10 m b. 20 m c. 30 m d. 40 m e. 80 m 4. A snowboarder coasts on a smooth track that rises from one level to another. If the snowboarder’s initial speed is 4 m/s, the snowboarder just makes it to the upper level and comes to rest. With a slightly greater initial speed of 5 m/s, the snowboarder is still moving to the right on the upper level. What is the
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This note was uploaded on 03/24/2009 for the course PHYS 104 taught by Professor Pengyi during the Fall '08 term at UNC.

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Physics Exam 2 - 1. 4.0 J of work are performed in...

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