1994 Physics Quiz Bowl (1-20)

1. Starting from rest, object 1 falls freely for 4.0 seconds, and object 2 falls freely for 8.0 seconds. Compared to object 1, object 2 falls:

A. half as far.
B. twice as far.
C. three times as far.
D. four times as far.
E. sixteen times as far.

2. A car starts from rest and uniformly accelerates to a final speed of 20.0 m/s in a time of 15.0 s. How far does the car travel during this time?

A. 150 m
B. 300 m
C. 450 m
D. 600 m
E. 800 m

3. A ball is thrown off a high cliff with no horizontal velocity. It lands 6.0 s later with a velocity of 40 m/s. What was the initial velocity of the ball?

A. 100 m/s up
B. 20 m/s up
C. 0
D. 20 m/s down
E. 100 m/s down

4. Newton’s First Law is based in part on the work of:

A. Dalton
B. Davy
C. Galileo
D. Joule
E. Young

5. A mass m; attached to a horizontal massless spring with spring constant k; is set into simple harmonic motion. Its maximum displacement from its equilibrium position is A. What is the mass’s speed as it passes through its equilibrium position?

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A
B
C
D
E

6. Which of the following statements about the speed of waves on a string are true?

I. The speed depends on the tension in the string.
II. The speed depends on the frequency.
III. The speed depends on the mass per unit length of the string.

A. II only
B. I & II only
C. I & III only
D. II & III only
E. I, II, & III

7. A positively charged conductor attracts a second object. Which of the following statements could be true?

I. The second object is a conductor with negative net charge.
II. The second object is a conductor with zero net charge.
III. The second object is an insulator with zero net charge.

A. I only
B. II only
C. III only
D. I & II only
E. I, II & III

8. A point charge of +4.0 mC is placed on the negative x-axis 0.20 m to the left of the origin, as shown in the accompanying figure. A second point charge q is placed on the positive x-axis 0.30 m to the right of the origin. The net electric field at the origin is zero. What is q?

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A. +9.0 mC
B. +6.0 mC
C. 0
D. –6.0 mC
E. –9.0 mC

9. An atomic mass unit is approximately equal to the mass of a(n):

A alpha particle
B. electron
C. photon
D. positron
E. proton

10. Which device can be used to detect nuclear radiation?

A. cyclotron
B. photographic film
C. betatron
D. synchrotron
E. Van de Graaff

11. The critical angle of a material is the angle of incidence for which the angle of refraction is:

A. 0º
B. 30º
C. 45º
D. 90º
E. 180º

12. Which of the following could NOT be used to indicate a temperature change? A change in:

A. color of a metal rod.
B. length of a liquid column.
C. pressure of a gas at constant volume.
D. electrical resistance.
E. mass of one mole of gas at constant pressure.

13. The purpose of the December 1993 space shuttle Endeavor mission was to repair the Hubble Space Telescope. The shuttle astronauts corrected the major problem of the telescope when they:

A. replaced an improperly ground lens.
B. installed corrective optics to compensate for the mis-shaped mirror.
C. freed a stuck camera shutter and installed a new roll of film.
D. installed a new primary mirror.
E. repositioned the transmitting antenna to point towards Earth.

14. An arrow is aimed horizontally, directly at the center of a target 20 m away. The arrow hits 0.050 m below the center of the target. Neglecting air resistance, what was the initial speed of the arrow?

A. 20 m/s
B. 40 m/s
C. 100 m/s
D. 200 m/s
E. 400 m/s

15. A car is traveling on a road in hilly terrain, see the figure below. Assume the car has speed v and the tops and bottoms of the hills have radius of curvature R.

The driver of the car is most likely to feel weightless:

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16. A car of mass m, traveling at speed v, stops in time t when maximum braking force is applied. Assuming the braking force is independent of mass, what time would be required to stop a car of mass 2m traveling at speed v?

A. ½ t
B. t
C. Ö2 t
D. 2 t
E. 4 t

17. A cork has weight mg and density 25% of water density. A string is tied around the cork and attached to the bottom of a water-filled container. As shown in the accompanying figure, the cork is totally immersed in the water.

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Expressed in terms of the cork weight mg, the tension in the string is:

A. 0
B. mg
C. 2 mg
D. 3 mg
E. 4 mg

18. An object is located 0.20 meters from a converging lens which has a focal length of 0.15 meters. Relative to the object, the image formed by the lens will be:

A. real, erect, and smaller.
B. real, inverted, and smaller.
C. real, inverted, and larger.
D. virtual, erect, and larger.
E. virtual, inverted, and smaller.

19. A string is firmly attached at both ends. When a frequency of 60 Hz is applied, the string vibrates in the standing wave pattern shown below. Assume the tension in the string and its mass per unit length do not change.

Which of the following frequencies could NOT also produce a standing wave pattern in the string?

A. 30 Hz
B. 40 Hz
C. 80 Hz
D. 100 Hz
E. 180 Hz

20. A magnet is dropped through a vertical copper pipe slightly larger than the magnet. Relative to the speed it would fall in air, the magnet in the pipe falls:

A. more slowly because it is attracted by the innate magnetic field of the pipe.
B. more slowly because the currents induced in the pipe produce an opposing magnetic field.
C. at the same rate.
D. more quickly because it is attracted by the innate magnetic field of the pipe.
E. more quickly because the currents induced in the pipe produce a opposing magnetic field.