p201f01-exam02

# p201f01-exam02 - Seat Physics P201 D Baxter/R Heinz EXAM#2...

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1. The unit for power is a watt. A watt is equivalent to: a. kg m 2 /s b. Js c. J/s d. kg ms 2 e. kW hr 2. Two blocks are released from the top of a building. One falls straight down while the other slides down a smooth ramp. One block is heavier than the other, but you don’t know which is which. If all friction is ignored, which one is moving faster when it reaches the bottom? a. The block that went straight down. b. The block that went down the ramp. c. The lighter block. d. The heavier block. e. They both will have the same speed. 3. A 4.0 kg object moving at a speed of 3.0 m/s strikes a 2.0 kg object initially at rest. Immediately after this elastic collision, the 4.0 kg object has a velocity of 1.5 m/s directed 29 from its initial line of motion. What is the speed of the 2.0 kg object immediately after the collision? a. 3.7 m/s b. 3.2 m/s c. 2.7 m/s d. 2.2 m/s e. 1.7 m/s
4. A ball is held at a height H above a floor as shown in the diagram below. It is then released and falls to the floor. If air resistance can be ignored, which of the five graphs below the diagram correctly gives the mechanical energy (the sum of kinetic and potential energies) of the ball as a function of the altitude y of the ball?

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## This note was uploaded on 07/02/2011 for the course PHYS 201 taught by Professor Woodahl during the Fall '09 term at Indiana.

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p201f01-exam02 - Seat Physics P201 D Baxter/R Heinz EXAM#2...

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