Glencoe Vibrations and Waves standardized test PDF

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Objectives:
To investigate the movement produced as a result of the forces applied by different skeletal muscles on bones. The Bone-muscle system will be simulated by a set of lever arms and springs, pivoted at a point “o”. The only motion produced by the skeletal muscle forces is rotational....

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Vibrations and Waves 1.

In Figure 14-4, if you doubled the mass of the pendulum, what effect, if any, would it have on its period? a. b. c. d.

It would have no effect. The new period would be half the old period. The new period would be the old period, divided by the square root of two. The new period would be the old period, times the square root of two.

2. A bike rider approaches a hill at a speed of 3.5 m/s. The mass of the bike and rider together is 77 kg. What is the initial kinetic energy of the system? a. 2.6×103 J b. 1.2×103 J c. 4.7×102 J d. 3.1×103 J 3.

The equation that represents gravitational potential energy is __________. a. PEg = 1/2mv2 b. PEg = Fd c. PEg = E + KE d. PEg = mgh

4.

When a wave pulse strikes a wall, it reflects back and is __________. a. reduced to zero b. inverted c. changed from compressional to transverse d. amplified

5. Two campers dock a canoe. One camper has a mass of 100.0 kg and moves forward at 3.0 m/s as he leaves the canoe to step onto the dock. With what speed do the canoe and other camper move if their combined mass is 175.0 kg? a. 5.3 m/s b. 8.25 m/s c. 4.0 m/s d. 1.7 m/s 6. An airplane passenger carries a 300.0-N suitcase up the stairs, a displacement of 5.50 m vertically and 3.75 m horizontally. How much work does the passenger do? a. 1.65×103 J b. 1.65×102 J c. 1.13×103 J d. 2.78×103 J 7. If the machine in Figure 10-11a is ideal and an effort force of 7.0 N just lifts a 14.0 N box situated 0.75 m from the pivot, what is the distance from the pivot point to where the effort force is exerted? a. 0.38 m b. 65 m c. 2.0 m d. 1.5 m 8. A 75-kg rock climber first climbs 25 m to the top of a quarry, then descends 75 m from the top to the bottom of the quarry. If the initial height is the reference level, what is the potential energy at the bottom?

a. b. c. d.

-5.5×104 J -3.7×104 J 3.7×104 J 1.8×104 J

9.

If the final temperature of a system is greater than the initial temperature, δt is __________. a. reduced b. positive c. eliminated d. negative

10.

The __________ of a machine is defined as the ratio of output work to input work. a. IMA b. reliability c. mechanical advantage d. efficiency

11. the box?

A student lifts a box of books that weighs 215 N. The box is lifted 1.75 m. What is the change in energy of a. b. c. d.

376 J 123 J 38.4 J 225 J

12. Before a collision, a 35-kg object is moving at +10.0 m/s. Find the impulse that acted on the object if, after the collision, it moves at +8.0 m/s. a. -2.8×102kg·m/s b. -7.0×101 kg·m/s c. 7.0×101 kg·m/s d. -7.0×102 kg·m/s 13.

In Figure 14-4, if you quadrupled the length of the string, what effect, if any, would it have on its period? a. b. c. d.

The period would be quadrupled. The period would be halved. It would have no effect. The period would be doubled.

14. A bike rider approaches a hill at a speed of 3.5 m/s. The mass of the bike and rider together is 77 kg. The rider coasts up the hill. Assuming that there is no friction, at what height will the bike come to rest? a. 4.1 m b. 3.7 m c. 0.62 m d. 1.6 m 15.

Which is an example of a heat engine? a. solar panels b. windmill c. volcano d. automobile engine

16.

Water boils at 100° on the __________ temperature scale.

a. b. c. d.

Kelvin Molecular Celsius Fahrenheit

17.

Which has the highest entropy? a. an ice cube b. a fire c. a diamond d. a stack of books

18.

What does a wave carry? a. heat b. matter c. particles d. energy

19.

Mechanical waves require __________. a. a gas b. a solid c. a vacuum d. a medium

20.

The principle of superposition states that __________. a. two or more waves can combine to form a new wave b. waves from different mediums can combine to form a new wave c. the energy of a wave depends on its position d. waves can never combine

Vibrations and Waves Practice Test Your score was 25%. You answered 5 correct and 15 incorrect. 1. In Figure 14-4, if you doubled the mass of the pendulum, what effect, if any, would it have on its period? a. It would have no effect. b. The new period would be half the old period. c. The new period would be the old period, divided by the square root of two. d. The new period would be the old period, times the square root of two. 2. A bike rider approaches a hill at a speed of 3.5 m/s. The mass of the bike and rider together is 77 kg. What is the initial kinetic energy of the system? a. 2.6×103 J b. 1.2×103 J c. 4.7×102 J d. 3.1×103 J 3. The equation that represents gravitational potential energy is __________. a. PEg = 1/2mv2 b. PEg = Fd c. PEg = E + KE d. PEg = mgh 4. When a wave pulse strikes a wall, it reflects back and is __________. a. reduced to zero b. inverted c. changed from compressional to transverse d. amplified 5. Two campers dock a canoe. One camper has a mass of 100.0 kg and moves forward at 3.0 m/s as he leaves the canoe to step onto the dock. With what speed do the canoe and other camper move if their combined mass is 175.0 kg? a. 5.3 m/s b. 8.25 m/s c. 4.0 m/s d. 1.7 m/s 6. An airplane passenger carries a 300.0-N suitcase up the stairs, a displacement of 5.50 m vertically and 3.75 m horizontally. How much work does the passenger do? a. 1.65×103 J b. 1.65×102 J c. 1.13×103 J d. 2.78×103 J 7. If the machine in Figure 10-11a is ideal and an effort force of 7.0 N just lifts a 14.0 N box situated 0.75 m from the pivot, what is the distance from the pivot point to where the effort force is exerted? a. 0.38 m b. 65 m

c. 2.0 m d. 1.5 m 8. A 75-kg rock climber first climbs 25 m to the top of a quarry, then descends 75 m from the top to the bottom of the quarry. If the initial height is the reference level, what is the potential energy at the bottom? a. -5.5×104 J b. -3.7×104 J c. 3.7×104 J d. 1.8×104 J 9. If the final temperature of a system is greater than the initial temperature, δt is __________. a. reduced b. positive c. eliminated d. negative 10. The __________ of a machine is defined as the ratio of output work to input work. a. IMA b. reliability c. mechanical advantage d. efficiency 11. A student lifts a box of books that weighs 215 N. The box is lifted 1.75 m. What is the change in energy of the box? a. 376 J b. 123 J c. 38.4 J d. 225 J 12. Before a collision, a 35-kg object is moving at +10.0 m/s. Find the impulse that acted on the object if, after the collision, it moves at +8.0 m/s. a. -2.8×102kg·m/s b. -7.0×101 kg·m/s c. 7.0×101 kg·m/s d. -7.0×102 kg·m/s 13. In Figure 14-4, if you quadrupled the length of the string, what effect, if any, would it have on its period? a. The period would be quadrupled. b. The period would be halved. c. It would have no effect. d. The period would be doubled. 14. A bike rider approaches a hill at a speed of 3.5 m/s. The mass of the bike and rider together is 77 kg. The rider coasts up the hill. Assuming that there is no friction, at what height will the bike come to rest? a. 4.1 m b. 3.7 m c. 0.62 m d. 1.6 m 15. Which is an example of a heat engine? a. solar panels b. windmill

c. volcano d. automobile engine 16. Water boils at 100° on the __________ temperature scale. a. Kelvin b. Molecular c. Celsius d. Fahrenheit 17. Which has the highest entropy? a. an ice cube b. a fire c. a diamond d. a stack of books 18. What does a wave carry? a. heat b. matter c. particles d. energy 19. Mechanical waves require __________. a. a gas b. a solid c. a vacuum d. a medium 20. The principle of superposition states that __________. a. two or more waves can combine to form a new wave b. waves from different mediums can combine to form a new wave c. the energy of a wave depends on its position d. waves can never combine

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