Final Angular Speed - Physics - Exam Paper, Exams of Physics

Download Final Angular Speed - Physics - Exam Paper and more Exams Physics in PDF only on Docsity! PHYSICS 218, Spring 2003 FINAL EXAM RED TEST DATE Fill in your name and I.D. number in bother letters and filled circles in the area indicated on the scantron sheet. Use only a #2 pencil. Sign the scantron sheet where indicated. For section, use your lab number. Mark the correct answers on your copy of the test and fill in the answers in the circles on the scantron sheet. Hand in the scantron sheet and keep your test to check answers against the key to be posted outside. BE SURE TO HAND IN YOUR SCANTRON SHEET IN THE CORRECT COLOR PILE. Pick the answer closest to yours as some roundoff occurs. There are 20 questions, do them all. This is a one-hour exam. 1. A 60.0-kg skater begins a spin with an angular speed of 6.0 rad/s. By changing the position of her arms, the skater decreases her moment of inertia by 50%. What is the skater s final angular speed? a. 3.0 rad/s b. 4.5 rad/s c. 9.0 rad/s d. 12 rad/s e. 18 rad/s A projectile is fired from a gun and has initial vertical and horizontal components of velocity equal to 40 m/s and 30 m/s respectively. 2. Refer to the information above. What is the speed of the projectile when it is at the highest point in its trajectory? a. zero b. 20 m/s c. 30 m/s d. 40 m/s e. 50 m/s A 70 kg astronaut pushes to the left of a spacecraft with a force F in gravity-free space. The spacecraft has a total mass of 10,000 kg. During the push, the astronaut accelerates to the right with an acceleration of 0.36 m/s2. 3. Refer to the information above. Determine the magnitude of the acceleration of the spacecraft. a. 0.36 m/s2 b. 51.4 m/s2 c. 2.5 β 10-3 m/s2 d. 7.0 β 10-3 m/s2 e. 397 m/s2 4. A roller coaster starts from rest at the top of a hill 18 m high. The car travels to the bottom of the hill and continues up the next hillwhich is 10 m high. How fast is the car moving at the top of the 10.0 m hill if friction is ignored? a. 6.4 m/s b. 8.1 m/s c. 12.5 m/s d. 15.3 m/s e. 27.4 m/s 5. A rope of length L is clamped at both ends. Which one of the following is not a possible wavelength for standing waves on this rope? a. L / 2 b. 2L / 3 c. L d. 2L e. 4L The figure below shows the displacement of a vibrating string versus position along the string. The periodic waves have a speed of 10 cm/s. A and B are two points along the string. 13. Refer to the information above. What is the amplitude of the wave? a. 2 cm b. 4 cm c. 8 cm d. 9 cm e. 16 cm 14. Refer to the information above. What is the wavelength of the wave? a. 3 cm b. 6 cm c. 9 cm d. 12 cm e. 15 cm 15. Refer to the information above. What is the frequency of the wave? a. 0.60 Hz b. 0.90 Hz c. 1.11 Hz d. 1.25 Hz e. 1.67 Hz 16. Refer to the information above. Approximately how long does it take the tennis ball to reach its maximum height? a. 0.50 s b. 2.04 s c. 4.08 s d. 6.08 s e. 9.80 s 17. Two pulses of identical shape travel toward each other in opposite directions on a string as shown in the figure below. What statement is true concerning this situation? a. The pulses will reflect from each other. b. The pulses will diffract from each other. c. The pulses will interfere to produce a standing wave. d. The pulses will pass through each other and produce beats. e. As the pulses pass through each other, they will interfere destructively. 18. A 0.050-kg lump of clay moving horizontally at 12 m/s strikes and sticks to a stationary 0.10-kg cart which can move on a frictionless air track. Determine the speed of the cart and clay after the collision. a. 2 m/s b. 4 m/s c. 6 m/s d. 8 m/s e. 12 m/s The figures below show the standing waves of sound in six organ pipes of the same length. Each pipe has one end open and the other end closed. Note: some of the figures show situations that are not possible. 19. Refer to the information above. Which figures do not illustrate possible resonant situations? a. 1 and 4 b. 2 and 3 c. 4 and 5 d. 5 and 6 e. 4, 5 and 6 20. Refer to the information above. Which pipe emits sound with the highest frequency? a. 1 b. 2 c. 3 d. 4 e. 6