PhysicsLAB: PhysicsBowl 2015 (Part 1)

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AAPT Quiz
PhysicsBowl 2015 (Part 1)

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All Division I students, START HERE.
All Division II students – skip the first 10 questions, begin on #11.
*** Treat g = 10 m/s² in ALL problems, #1-#50.

1. Which one of the following choices correctly represents a length of 3.00 mm?

(A) 3.00 × 10⁻⁶ m(B) 3.00 × 10⁻³ m(C) 3.00 × 10−2 m(D) 3.00 × 10³ m(E) 3.00 × 10⁶ m

2. A box uniformly slides 7.50 m to rest across a flat surface in a time of 12.0 s. What was the initial speed of the box when it started its slide?

(A) 0.313 m/s(B) 0.625 m/s(C) 1.25 m/s(D) 2.50 m/s(E) 5.00 m/s

3. Which one of the following quantities is not a vector quantity?

(A) Average speed(B) Average velocity(C) Linear momentum(D) Acceleration(E) Average force

4. A standing wave on a string is produced. Which one of the following choices best describes the location on the string at which maximum constructive interference occurs?

(A) node(B) antinode(C) harmonic(D) overtone(E) amplitude

5. An object initially is moving upward while in free fall. Which one of the following choices best represents the direction of the object’s acceleration during its flight?

(A) A(B) B(C) C(D) D(E) E

6. A car travels at 20.0 miles/hr. Which one of the following choices best represents the speed of the car in SI units of m/s?

(A) 533 m/s(B) 45.0 m/s(C) 20.0 m/s(D) 8.9 m/s(E) 0.75 m/s

7. An object moves clockwise with constant speed around the vertical circle shown. Which arrow best indicates the direction of the object’s instantaneous acceleration at the point labeled X?

(A) A(B) B(C) C(D) D(E) E

8. A negatively charged balloon remains at rest when placed on a vertical wall. Which one of the following terms is most closely associated with the electrical phenomenon allowing the balloon to remain on the wall?

(A) Radiation(B) Grounding(C) Reduction(D) Current(E) Polarization

9. Two cars are moving to the right on a horizontal track, each with constant acceleration. At an instant of time, the information about the cars is shown:

Car #1: position = 125.0 m; velocity = 13.0 m/s; constant acceleration = 1.5 m/s²
Car #2: position = 80.0 m; velocity = 9.30 m/s; constant acceleration = 5.5 m/s²

During the next 1.0 s of motion, which one of the following choices best represents what happens to the distance between the cars?

(A) It decreases during the entire 1.0 second of motion.
(B) It increases during the entire 1.0 second of motion.
(C) It initially increases and then decreases resulting in a greater distance between the cars after 1.0 second.
(D) It initially increases and then decreases resulting in a smaller distance between the cars after 1.0 second.
(E) It initially increases and then decreases resulting in the same distance between the cars after 1.0 second.

10. For the circuit shown, the three light bulbs have identical resistance R, the battery is ideal, and all wires have no resistance. Which one of the following choices correctly identifies the light bulbs that either become dimmer or go out completely when the switch, S, in the circuit is closed?

(A) All 3 bulbs(B) Bulbs #1 and #2 only(C) Bulb #3 only(D) Bulb #1 only(E) None of the bulbs

All Division 1 students, continue to question #40.
All Division 2 students, START HERE. Numbers #1 – #10 on your answer sheet should be blank. Your first answer should be for #11.
*** Treat g = 10 m/s² for ALL questions #1 – #50.

11. Two length measurements are made and recorded as L₁ = 84.55 cm and L₂ = 33.55 cm. Two other length measurements are made and recorded as L₃ = 1.750 cm and L₄ = 1.250 cm. These measurements are used to compute the quantity (L₁ + L₂) - (L₃ + L₄) using the rules of significant figures. Which one of the following choices best represents the correct result to this calculation?

(A) 115.100 cm(B) 115.10 cm(C) 115.1 cm(D) 115 cm(E) 120 cm

12. A box of mass 12.0 kg is being pushed to the right across a horizontal surface. When the box has 12.0 J of kinetic energy, a 12.0 N net force acts on it. Which one of the following choices best represents the magnitude of the linear momentum of the box at this instant?

(A) 6.00 kg(m/s)(B) 8.50 kg(m/s)(C) 12.0 kg(m/s)(D) 17.0 kg(m/s)(E) 24.0 kg(m/s)

13. An object is being pushed at constant speed on an inclined plane. The free body diagram of the object is shown with the gravitational force represented by W, the friction force by f, the applied external push parallel to the incline by F, and the normal force with the surface by n. Which one of the following choices represents correct relationships between the forces?

(A) n > W and F < f(B) n < W and F = f(C) n < W and F < f(D) n = W and F > f(E) n = W and F = f

14. A particle has a position, x, as a function of time, t, given as x(t) = -15 - 25t + 10t². Which one of the following choices represents the magnitude of the particle’s acceleration? All quantities are expressed in base SI units.

(A) 5 m/s²(B) 10 m/s²(C) 15 m/s²(D) 20 m/s²(E) 40 m/s²

15. A skydiver falls downward through the air with constant speed. Which one of the following choices correctly describes the Newton’s Third Law pair force to the air resistance acting on the skydiver during the fall?

(A) There is no Third Law pair force for this kind of situation.
(B) The gravitational force acting on the skydiver by the Earth.
(C) The force that molecules in the air exert on neighboring molecules in the air.
(D) The force exerted on molecules in the air by the ground.
(E) The force exerted on molecules in the air by the skydiver.

16. “Particles of matter also have associated wavelengths and can behave as waves.” To which scientist is this concept attributed?

(A) de Broglie(B) Pauli(C) Fermi(D) Heisenberg(E) Rydberg

17. An object starts at the origin and its velocity along a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time for which the object is moving away from the origin?

(A) Only for times 0s < t < 3s
(B) Only for times 0s < t < 5s
(C) Only for times 3s < t < 5s
(D) Only for times 0s < t < 7s
(E) For times 0s < t < 3s and 5s < t < 9s

18. A 680 Hz tuning fork is placed over a tube open at both ends that is filled with air. As a result, a standing wave in the 3rd harmonic is produced. The speed of sound in air is 340 m/s. What is the length of the tube?

(A) 0.38 m(B) 0.67 m(C) 0.75 m(D) 1.33 m(E) 1.50 m

19. Ten moles of helium gas are enclosed in a container at a pressure of 1.00 atm and at a temperature of 400 K. Which one of the following choices best represents the density of this gas sample?

(A) 0.012 kg/m³(B) 0.12 kg/m³(C) 1.2 kg/m³(D) 120 kg/m³(E) 1.2 × 10⁴ kg/m³

20. Which one of the following choices best represents the work for which the 2014 Nobel Prize in Physics was awarded?

(A) Landing the Rosetta Philae Lander on the surface of Comet 67P/Churyumov-Gerasimenko
(B) The detection of dark matter
(C) The invention of the blue LED
(D) The creation of a tractor beam using sound
(E) The detection of neutrinos from the Sun which agreed with theory

21. An object is launched from the ground at an angle of 60° above the horizontal with a speed of 20.0𝑚𝑠. What is the magnitude of the average velocity of the object from just after launch until it reaches its highest vertical position during flight?

(A) 13.7 m/s(B) 13.2 m/s(C) 10.0 m/s(D) 9.3 m/s(E) 8.7 m/s

22. Satellite 1 makes a circular orbit around the Earth with a radius r₁ = R.

Satellite 2 makes a circular orbit around the Earth with a radius r₂ = 2R.

We let v represent the speed of a satellite and a represent the magnitude of a satellite’s acceleration. Which one of the following choices gives the correct relation between the speeds and accelerations of the satellites?

23. A car moves with constant speed around a horseshoe-shaped path as shown with the arrows in the figure. Which one of the following choices best describes the direction of the average acceleration of the car in traveling from W to X?

24. A mass on a frictionless incline has a gravitational force, a normal force from the incline, and a force applied by a person that all are equal in magnitude. The mass remains at rest and the incline makes an angle 𝜃 counterclockwise from the horizontal. Which one of the following choices best describes the orientation of the applied force by the person? The +x-axis is directed upward, parallel to the incline’s surface as shown in the figure.

(A) The applied force is oriented directly along the +x-axis.
(B) The applied force is oriented at an angle θ clockwise from the +x axis.
(C) The applied force is oriented at an angle (90°-θ) clockwise from the +x axis.
(D) The applied force is oriented at an angle (90°−θ) counterclockwise from the +x axis.
(E) This is a completely impossible situation that never can be realized physically.

25. A gas undergoes the unusual process M → N in the pressure vs. volume graph shown. Which one of the following choices properly represents the signs of the internal energy change of the gas, ΔU, the total energy transferred as heat to the gas, Q, and the total work done on the gas by the surroundings, W, for this process?

(A) A(B) B(C) C(D) D(E) E

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