AAPT Quiz
PhysicsBowl 2009 (Part 1)
All Division I students, START HERE.
All Division II students – skip the first 10 questions, begin on #11.
1. Approximately how many seconds is it until the PhysicsBowl takes place in the year 2109 ?
(A) 10
^{2}
(B) 10
^{7}
(C) 10
^{8}
(D) 10
^{9}
(E) 10
^{12}
2. A room has a floor area of 25 m
^{2}
. What is this area written in cm
^{2}
?
(A) 25000000
(B) 250000
(C) 2500
(D) 0.25
(E) 0.0025
3. Which one of the following quantities can have its unit expressed as kg m/sec
^{2}
?
(A) Force
(B) Power
(C) Energy
(D) Pressure
(E) Linear Momentum
4. The length measurement L = 0.01230 cm has how many significant digits?
(A) 6
(B) 5
(C) 4
(D) 3
(E) 2
5. At an instant of time, a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/sec, and an acceleration of 1.0 m/sec
^{2}
. What is the block’s kinetic energy (in Joules) at this instant?
(A) 1.0
(B) 1.5
(C) 2.0
(D) 4.0
(E) 8.0
6. For a standing wave mode on a string fixed at both ends, adjacent antinodes are separated by a distance of 20 cm. Waves travel on this string at a speed of 1200 cm/sec. At what frequency is the string vibrated to produce this standing wave?
(A) 120 Hz
(B) 60 Hz
(C) 40 Hz
(D) 30 Hz
(E) 20 Hz
7. The equivalent resistance of the circuit shown below with resistances R
_{1}
= 4.00
Ω
, R
_{2}
= 3.00
Ω
, and R
_{3}
= 2.00
Ω
is
(A) 0.111
(B) 0.923
(C) 1.08
(D) 3.00
(E) 9.00
8. Consider the motion of an object given by the position vs. time graph shown. For what time(s) is
the speed of the object greatest?
(A) At all times from t = 0.0 sec
→
t = 2.0 sec
(B) At time t = 3.0 sec
(C) At time t = 4.0 sec
(D) At all times from t = 5.0 sec
→
t = 7.0 sec
(E) At time t = 8.5 sec
9. The free fall trajectory of an object thrown horizontally from the top of a building is shown as the dashed line in the figure. Which sets of arrows best correspond to the directions of the velocity and of the acceleration for the object at the point labeled P on the trajectory?
(A)
(B)
(C)
(D)
(E)
10. A car with mass M initially travels to the East with speed 4V. A truck initially travels to the West with speed 3V. After the vehicles collide, they move together to the West with common speed 2V . What is the mass of the truck?
(A) 2M
(B) 3M
(C) 4M
(D) 5M
(E) 6M
ATTENTION: All Division 01 students, continue through question 40.
ATTENTION: All Division 02 students, START HERE. Numbers 1-10 on your answer sheet should be blank. Your first answer should be for #11.
11. What is the orientation of the Earth, Sun, and Moon during a total lunar eclipse?
(A) The Sun is between the Earth and Moon.
(B) The Earth is between the Sun and Moon.
(C) The Moon is between the Sun and Earth.
(D) The Earth, Moon, and Sun make a right triangle.
(E) The Earth is above the Sun and Moon.
12. A 5.0 kg solid sphere is in free fall near the surface of the Earth. What is the magnitude of the gravitational force acting on the Earth by the solid sphere? The Earth’s mass is 5.98 × 10
^{24}
kg.
(A) 0 N
(B) 5 N
(C) It is immeasurably small, but not zero.
(D) 50 N
(E) 5.98 × 10
^{25}
N
Questions 13 – 14 deal with the following information:
In the figure to the right, a box moves with speed 5.00 m s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directly to the left with a constant force of F = 240 N.
The box, of mass m = 20.0 kg, has a speed of 2.50 m/sec when it reaches the top of the incline.
13. What is the magnitude of the acceleration of the box as it slides up the incline?
(A) 12.0 m/sec
^{2}
(B) 10.0 m/sec
^{2}
(C) 5.88 m/sec
^{2}
(D) 1.88 m/sec
^{2}
(E) 0.938 m/sec
^{2}
14. How much work is done by the applied force, F, to the box?
(A) 2400 J
(B) 1920 J
(C) 1200 J
(D) 988.5 J
(E) - 187.5 J
15. An ideal gas in a closed container of volume 6.0 L is at a temperature of 100ºC. If the pressure of the gas is 2.5 atm, how many moles of gas are in the container?
(A) 0.0048
(B) 0.018
(C) 0.49
(D) 1.83
(E) 490
16. What condition must be met in order to use the rotational kinematics equation
(A) The angular acceleration is constant.
(B) The angular velocity is constant.
(C) The linear acceleration is zero.
(D) The angular acceleration is zero.
(E) There is no restriction on the use of this equation.
17. A toy car moves 3.0 m to the North in one second. The car then moves at 9.0 m/sec due South for two seconds. What is the average speed of the car for this three second trip?
(A) 4.0 m/sec
(B) 5.0 m/sec
(C) 6.0 m/sec
(D) 7.0 m/sec
(E) 12.0 m/sec
18. A wire has a conventional current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at this instant is
(A) zero.
(B) directed out of the plane of the page.
(C) directed into the plane of the page.
(D) directed toward the top of the page.
(E) directed toward the bottom of the page.
19. A scientist claims to be investigating “The transfer of energy that results from the bulk motion of a fluid.” Which of the following terms best describes the energy transfer method that this scientist is
studying?
(A) radiation
(B) convection
(C) conduction
(D) latent heat
(E) specific heat
20. A projectile launched from the ground landed a horizontal distance of 120.0 m from its launch point. The projectile was in the air for a time of 4.00 seconds. If the projectile landed at the same vertical position from which it was launched, what was the launch speed of the projectile? Ignore air resistance.
(A) 22.4 m/sec
(B) 30.0 m/sec
(C) 36.1 m/sec
(D) 42.4 m/sec
(E) 50.0 m/sec
21. A 20.0 kg box remains at rest on a horizontal surface while a person pushes directly to the right on the box with a force of 60 N . The coefficient of kinetic friction between the box and the surface is = 0.20 μ
_{k}
. The coefficient of static friction between the box and the surface is μ
_{s}
= 0.60. What is the magnitude of the force of friction acting on the box during the push?
(A) 200 N
(B) 120 N
(C) 60 N
(D) 40 N
(E) 0 N
22. A point object is connected to the end of a long string of negligible mass and the system swings as a simple pendulum with period T. What is the period of the pendulum if the string is made to have one-quarter of its original length?
(A) 4T
(B) 2T
(C) T
(D) T/2
(E) T/4
23. A person rubs a neutral comb through their hair and the comb becomes negatively charged. Which of the following is the best explanation for this phenomenon?
(A) The hair gains protons from the comb.
(B) The hair gains protons from the comb while giving electrons to the comb.
(C) The hair loses electrons to the comb.
(D) The comb loses protons to the person’s hand holding the comb.
(E) The comb loses protons to the person’s hand while also gaining electrons from the hair.
24. A point mass moves along a horizontal circular path of radius 8.0 m with a constant kinetic energy of 128 J. What is the magnitude of the net force acting on the mass as it moves?
(A) 64 N
(B) 32 N
(C) 16 N
(D) 8 N
(E) 0 N
25. Which of the following types of electromagnetic radiation has the largest magnitude of momentum per photon?
(A) FM radio
(B) Microwaves
(C) Violet light
(D) Infrared light
(E) Gamma rays
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