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21. The diagram below depicts iron filings sprinkled around three permanent magnets. Pole R is the same as poles
A. T and Y |
22. A rotating fan blade has kinetic energy K when rotating with constant angular velocity. When the angular velocity is reduced to one-third, the kinetic energy becomesA. 9K B. 3K C. K D. K/3 E. K/9 |
A. A |
24. A planet has a radius one-half that of Earth and a mass one-fifth the Earth's mass. The gravitational acceleration at the surface of the planet is most nearly A. 4.0 m/s2 |
25. A car whose mass is 1200 kg is accelerated from rest by a constant force of 2400 N. What is the speed of the car 8.0 sec after beginning? A. 0.40 m/s |
26. A ball with a mass of 0.50 kg and a speed of 6.0 m/s collides perpendicularly with a wall and bounces off with a speed of 4.0 m/s in the opposite direction. What is the magnitude of the impulse acting on the ball? A. 13 J |
27. Four identical light bulbs K, L, M, and N are connected in the electrical circuit shown in the accompanying diagram. Rank the current through the bulbs.
A. K>L>M>N |
28. A solid disk has mass m, radius I; and rotational inertia ½ mr2. The disk is initially at rest. A constant force F acts tangential to the rim. What is the angular acceleration of the disk?
|
29. A 50-kg student stands on a scale in an elevator. At the instant the elevator has a downward acceleration of 1.0 m/s² and an upward velocity of 3.0 m/sec, the scale reads approximately A.
350 N |
30. Four positive point charges are arranged as shown in the accompanying diagram. The force between charges 1 and 3 is 6.0 N; the force between charges 2 and 3 is 5.0 N; and the force between charges 3 and 4 is 3.0 N. The magnitude of the total force on charge 3 is most nearly
A. 6.3 N E. 14 N |
31. An object sliding down an inclined plane has speed 0.40 m/s two seconds after it begins to slide. Approximately how far does it travel in three seconds? A. 0.15
m |
32. A 3.0-kg block with initial speed 4.0 m/s slides across a rough horizontal floor before coming to rest. The frictional force acting on the block is 3.0 N. How far does the block slide before coming to rest? A. 1 .0 mB. 2.0 m C. 4.0 m D. 8.0 m E. 16 m |
33. In the following problem, the word "weight" refers to the force a scale registers. If the Earth were to stop rotating, but not change shape, A. the weight
of an object at the equator would increase. |
34. In the accompanying circuit diagram, the current through the 6.0 W resistor is 1.0 A. What is the power supply voltage V? 
A. 10 V |
35. A pipe that is closed at one end and open at the other resonates at a fundamental frequency of 240 Hz. The next lowest/highest frequency it resonates at is most nearly A. 60 Hz |
36. The critical angle in a transparent substance surrounded by air is 30º. The speed of light in the substance (in multiples of 108 m/s) is most nearly A. 1 .0B. 1.5 C. 2.0 D. 3.0 E. 6.0 |
37. Two isolated parallel plates are separated by a distance d. They carry opposite charges Q and each has surface area A. Which of the following would increase the strength of the electric field between the plates?
A. l only |
38. A uniform meter stick of mass 0.20 kg is pivoted at the 40-cm mark. Where should one hang a mass of 0.50 kg to balance the stick? A. 16 cm |
39. In the circuit diagrammed to the right, the 3.00-mF capacitor is fully charged at 18.0 mC. What is the value of the power supply voltage V?
A. 4.40 V |
40. Coin I is thrown upward from the top of a 100-m tower with a speed of 15 m/s. Coin II is dropped (zero initial speed) from the top of the tower 2.0 seconds later. Assume g is 10 m/s2. How far below the top of the tower does coin I pass coin II? A. 1.6 m |
| Copyright © 2002-1994 All rights reserved American Association of Physics Teachers Used with written permission. |
| Copyright © 2002-1999 PDF
conversion Catharine H. Colwell All rights reserved PhysicsLAB Mainland High School Daytona Beach, FL 32114 |
