p201f01-exam02

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

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Seat # Physics P201 D. Baxter/R. Heinz EXAM #2 October 18, 2001 7:00–9:00 PM INSTRUCTIONS 1. Sit in SEAT # given above. 2. DO NOT OPEN THE EXAM UNTIL YOU ARE TOLD TO DO SO. 3. Print your name (last name first) and blacken in the letters on the answer sheet with a #2 pencil. 4. Print your student number (identification number) and blacken in the numbers on the answer sheet with a #2 pencil. 5. Use the fronts and backs of the question sheets for scratch work. Do not use any other scratch sheets. 6. This is a multiple choice exam. Blacken in the answer to each question on the answer sheet. Fill in one and only one answer to each question. 7. Keep your eyes on your own work. 8. You have two hours to complete the exam. When you finish, please show your picture ID as you turn in your answer sheet. Please leave quietly so others are not disturbed. 9. THERE ARE 24 QUESTIONS. PLEASE ANSWER ALL OF THEM. THERE IS NO PENALTY FOR GUESSING! You may use a calculator and two self-prepared sheets of formulas. You may also consult the appendices in the front and back of the book.
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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
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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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p201f01-exam02 - Seat # Physics P201 D. Baxter/R. Heinz...

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