PhysicsLAB: 1999 Physics Quiz Bowl (Part 2)

PhysicsLAB

AAPT Quiz
1999 Physics Quiz Bowl (Part 2)

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21. What happens to the force of gravitational attraction between two small objects if the mass of each object is doubled and the distance between their centers is doubled?

It is doubledIt is quadrupledIt is halvedIt is reduced fourfoldIt remains the same

22. A child whirls a ball at the end of a rope, in a uniform circular motion. Which of the following statements is NOT true?

The speed of the ball is constant
The velocity is of the ball is constant
The radius is constant
The magnitude of the baIl's acceleration is constant
The acceleration of the ball is directed radially irnvards towards the center

23. What is the resistance of a 60 watt light bulb designed to operate at 120 volts?

0.5 ohms2 ohms6 ohms24 ohms7200 ohms

24. Consider the two oppositely charged plates as shown in the diagram.

At which of the marked points shown in the diagram would a positively charged particle have the greatest electrical potential energy?

ABCDE

25. Pioneering radio station KFKA started broadcasting 78 years ago at 1310 AM (1.31 Mhz) on the dial. What is the approximate length of its radio waves?

23 m230 m2300 m23000 m3 x 10⁸ m

26. A beam of light traveling in glass (n_g = 1.5) strikes a boundary with air (n_a = 1.0) at point P. The angle of incidence is 60º as shown in the diagram.

Which ray would best indicate the beam's path after point P?

ABCDE

27. Assume that waves are propagating in a uniform medium. If the frequency of the wave source doubles then

the speed of the waves doubles
the wavelength of the waves doubles
the speed of the waves halves
the wavelength of the waves halves
none of the above

28. In the diagram, which of the following would represent a zone or zones of constructive interference?

1: from P to A
2: from P to B
3: from P to C

only zone number 1
only zone number 2
only zone number 3
only zones numbered 1 and 2
only zones numbered 1 and 3

29. Two light wires are hung vertically. With electrical current in both wires directed upwards

the wires will experience a force of attraction
the wires will experience a force of repulsion
the force on the right hand wire will cancel the force on the left hand wire
both wires will experience a torque until they are at right angles to one another
none of the above

30. Given the simple electrical circuit shown below.

If the current in all three resistors is equal, which of the following statements must be true?

X, Y, and Z all have equal resistance
X and Y have equal resistance
X and Y added together have the same resistance as Z
X and Y each have more resistance than Z
none of the above must be true

31. Wire Y is made of the same material but has twice the diameter and half the length of wire X. If wire X has a resistance of R then wire Y would have a resistance of

R/8R/2R2R8R

32. A wooden box is first pulled across a horizontal steel plate as shown in the diagram A. The box is then pulled across the same steel plate while the plate is inclined as shown in diagram B.

How does the force required to overcome friction in the inclined case (B) compare to the horizontal case (A)?

the frictional force is the same in both cases
the inclined case has a greater frictional force
the inclined case has less frictional force
the frictional force increases with angle until the angle is 90º, then drops to zero
more information is required

33. One object at the surface of the Moon experiences the same gravitational force as a second object at the surface of the Earth. Which of the following would be a reasonable conclusion?

both objects would fall at the same acceleration
the object on the Moon has the greater mass
the object on the Earth has the greater mass
both objects have identical masses
the object on Earth has a greater mass but the Earth has a greater rate of rotation.

34. A small light bulb is placed 20 cm to the right of a converging lens of focal length 10 cm. Which of the following statements is NOT true about the image of the bulb formed by the lens?

It is virtual.
It is inverted.
It is the same size as the bulb.
It is 20 cm to the left of the lens.
It can be projected on a screen.

35. The following equation is an example of what kind of nuclear reaction?

fissionfusionalpha decaybeta decaypositron decay

36. What happens to the inertia of an object when its velocity is doubled?

the object's inertia becomes

2 times greater
the object's inertia becomes 2 times greater
the object's inertia becomes 4 times greater
the object's inertia becomes 8 times greater
the object's inertia is unchanged

37. The diagram below represents a simple electric circuit composed of 5 identical light bulbs and 2 flashlight cells.

Which bulb (or bulbs) would you expect to be the brightest?

V only
V and W only
V and Z only
V, W and Z only
all five bulbs are the same brightness

38. An image is formed on a screen by a convergent lens. If the top half of the lens is then covered what will happen to the image?

the image is dimmer but otherwise unchanged
the image becomes half as big
only the top half of the image is produced
only the bottom half of the image is produced
the image becomes half as big and is inverted from it original position.

39. The driver of an automobile must carefully control each of the following devices. Which of these devices can cause an acceleration in a moving car?

1: the break pedal
2: the gas pedal
3: the steering wheel

only number 1only number 2only number 3only numbers 1 and 2numbers 1, 2, and 3

40. Three different resistors R₁, R₂ and R₃ are connected in parallel to a battery. Suppose R₁ has 2V across it, R₂ = 4 ohms, and R₃ dissipates 6 W. What is the current in R₃?

0.33 A0.5 A2 A3 A12 A

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