1996 Physics Quiz Bowl (1-20)

1. A light year is a unit of:

A. acceleration
B. distance
C. speed
D. time
E. velocity

2. A beam of light is directed toward a point P on a boundary as shown below.

1996ques2diagram.gif (2033 bytes)

Which segment best represents the refracted ray?

A. PA
B. PB
C. PC
D. PD
E. PE

3. If the frequency of sound is doubled, the wavelength:

A. halves and the speed remains unchanged.
B. doubles and the speed remains unchanged.
C. is unchanged and the speed doubles.
D. is unchanged and the speed halves.
E. the wavelength halves and the speed halves.

4. When the velocity of a moving object is doubled, its _____ is also doubled.

A. acceleration
B. kinetic energy
C. mass
D. momentum
E. potential energy

5. When metal rod 1 is placed in contact with metal rod 2, thermal energy flows from 1 to 2. A possible explanation is that 1 has a higher ____ than 2.

A. heat
B. heat capacity
C. mass
D. specific heat
E. temperature

6. Impulse, F_net Dt , is best related to:

A. momentum.
B. change in momentum.
C. kinetic energy.
D. change in kinetic energy.
E. none of these.

7. An amber rod is given a net negative charge and held at rest. Which of the following statements is true?

A. The amber rod is surrounded only by a magnetic field that circles the rod.
B. The amber rod is surrounded only by an electric field that is directed out from the rod.
C. The amber rod is surrounded only by an electric field that is directed into the rod.
D. The amber rod is surrounded by both a magnetic field that circles the rod and an electric field that is directed out from the rod.
E. The amber rod is surrounded by both a magnetic field that circles the rod and an electric field that is directed into the rod.

8. A ball is rolled off the edge of a horizontal table. The ball has an initial speed vo and lands on the floor some distance from the base of the table. Which of the following statements concerning the fall of the ball is FALSE?

A. The time of flight depends on the height of the table.
B. One of the components of the final speed will be v_o .
C. The ball will accelerate.
D. The ball will have a longer flight time if vo is increased.
E. The ball will fall because of the force due to gravity.

9. When a falling object reaches terminal velocity, it:

A. is no longer subject to the friction of air.
B. moves downward with constant velocity.
C. has an acceleration of approximately 10 m/s² .
D. has no downward velocity.
E. has an upward acceleration.

10 . Two wave pulses approach each other as seen in the figure to the right. The wave pulses overlap at point P.

1996ques10diagram.gif (1150 bytes)

Which diagram best represents the appearance of the wave pulses as they leave point P?

1996ques10ans.gif (2157 bytes)

11. A simple pendulum of mass m and length L has a period of oscillation T at angular amplitude q = 5º measured from its equilibrium position. If the amplitude is changed to 10º and everything else remains constant, the new period of the pendulum would be approximately:

12. Two football players with mass 75 kg and 100 kg run directly toward each other with speeds 6.0 m/s and 8.0 m/s respectively. If they grab each other as they collide, the combined speed of the two players just after the collision would be:

A. 2.0 m/s
B. 3.4 m/s
C. 4.6 m/s
D. 7.1 m/s
E. 8.0 m/s

13. A potassium

nucleus emits a b - and becomes:

14. A 30-kg child who is running at 4.0 m/s jumps onto a stationary 10 kg skateboard. The speed of the child and the skateboard is approximately:

A. 3.0 m/s
B. 4.0 m/s
C. 5.0 m/s
D. 6.0 m/s
E. 7.0 m/s

15. A car whose mass is 1500 kg is accelerated uniformly from rest to a speed of 20 m/s in 10 s. The magnitude of the net force accelerating the car is:

A. 1000 N
B. 2000 N
C. 3000 N
D. 20000 N
E. 30000 N

16. When two resistors, having resistance R₁ and R₂ , are connected in parallel, the equivalent resistance of the combination is 5 W. Which of the following statements about the resistances is correct?

A. Both R₁ and R₂ are greater than 5 W.
B. Both R₁ and R₂ are equal to 5 W.
C. Both R₁ and R₂ are less than 5 W.
D. The sum of R₁ and R₂ is 5 W.
E. One of the resistances is greater than 5 W, one of the resistances is less than 5 W.

17. A ball which is dropped from the top of a building strikes the ground with a speed of 30 m/s. Assume air resistance can be ignored. The height of the building is approximately:

A. 15 m
B. 30 m
C. 45 m
D. 75 m
E. 90 m

18. A rubber ball is held motionless a height h_o above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the total energy E of the ball and its height h above the surface?

1996ques18ans.gif (2794 bytes)

19. Light that has wavelength of 500 nm in air has wavelength 400 nm in a transparent material. What is the index of refraction of the material?

A. 0.64
B. 0.80
C. 1.00
D. 1.25
E. 1.56

20. A force of 10 N stretches a spring that has a spring constant of 20 N/m. The potential energy stored in the spring is:

A. 2.5 J
B. 5.0 J
C. 10 J
D. 40 J
E. 200 J