PhysicsLAB: PhysicsBowl 2017 (Part 1)

PhysicsLAB

AAPT Quiz
PhysicsBowl 2017 (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. A scientist computes a speed as (12 mm)/(3 µs). Which one of the following choices represents this same speed?

(A) 4 km/s(B) 4 nm/s(C) 4 m/s(D) 4 (Gm)/s(E) 4 (pm)/s

2. A small object is released from rest and falls freely for 4.00 s until reaching the ground. What was the height above the ground from which the object was released?

(A) 10.0 m(B) 20.0 m(C) 40.0 m(D) 80.0 m(E) 160.0 m

3. Which one of the following choices is a vector quantity?

(A) average speed(B) kinetic energy(C) mass(D) time(E) acceleration

4. At which one of the following temperatures does water undergo a phase change into a solid at a pressure of 1.0 atm?

(A) 273 K(B) 0 ºF(C) 32 ºC(D) 100 ºF(E) 0 K

5. Which one of the following choices is most closely associated with the following observation about an isolated object: “The linear momentum of the object is constant.”?

(A) Huygens’ Principle(B) Kepler’s First Law(C) Hooke’s Law(D) Pascal’s Principle(E) Newton’s First Law

6. A mass connected to an ideal spring oscillates with a period T when it is released from rest at a position A from equilibrium. Which one of the following choices correctly identifies the period of oscillation for the mass connected to the same spring when it is released from rest at a position 2A from equilibrium?

(A) (1/4) T(B) (1/2) T(C) T(D) 2T(E) 4T

7. A traveling sine wave of frequency 3.0 Hz is known to move at 6.0 m/s on a string. Which one of the following figures best represents what a one-meter section of the string could look like at an instant of time?

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

8. A mass moves along the x-axis following the position vs. time graph provided. During what time interval(s) does the mass have an acceleration of 0 m/s²? Time is represented as t.

9. A 4.00 kg object moves to the right with speed 5.00 m/s. A 5.00 kg object moves to the left with speed 3.00 m/s. After colliding, the 4.00 kg object moves to the left with speed 1.00 m/s. What is the speed of the 5.00 kg object after the collision?

(A) 1.00 m/s(B) 1.80 m/s(C) 3.00 m/s(D) 4.11 m/s(E) 7.80 m/s

10. A 2000 kg car moves over a hill at a constant speed of 12.0 m/s. At the very top of the hill, the shape of the road can be approximated as a circle with radius 25 m, as indicated in the figure. Which one of the following choices best represents the magnitude of the upward force exerted by the road on the car?

(A) 0 kN(B) 8.5 kN(C) 11.5 kN(D) 20.0 kN(E) 31.5 kN

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.

The next two questions share the same information Base your answers to questions 11 and 12 on the information below.

A 5.00 kg block slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time.

11. What is the average speed of the block during the motion described?

(A) 7.00 m/s(B) 3.74 m/s(C) 3.65 m/s(D) 2.65 m/s(E) 2.58 m/s

12. Which one of the following choices best represents the magnitude of the block’s acceleration during the motion described?

(A) 3.43 m/s²(B) 2.40 m/s²(C) 1.20 m/s²(D) 0.329 m/s²(E) 0.232 m/s²

13. According to currently accepted theory, dark matter makes up approximately what percent of the Universe?

(A) 5 %(B) 25 %(C) 50 %(D) 80 %(E) 99 %

14. A block is suspended in the air at the end of a string held by a person. The person pulls on the string uniformly accelerating the block upward for a short time. During this time, which one of the following choices correctly identifies the Newton’s Third Law pair force to the force of the string on the block?

(A) the gravitational force from the Earth on the block
(B) the force from the string on the person
(C) the force from the person on the string
(D) the force from the block on the string
(E) the force from the person on the block

15. Two blocks X and Y are in contact on a frictionless horizontal surface. A constant 35 N force is applied to the right onto block X. What is the magnitude of the force that block Y exerts onto block X?

(A) 35 N(B) 28 N(C) 25 N(D) 14 N(E) 10 N

16. Which one of the following choices best represents the type of electromagnetic wave associated with a frequency of 10¹⁸ Hz?

(A) AM radio(B) microwaves(C) ultraviolet light(D) X rays(E) red light

17. The following lengths are added together: L₁ = 8.36 × 10¹ m, L₂ = 9.20 × 10² m, L₃ = 1.39 × 10⁻¹ m, and L₄ = 2.1 × 10⁰ m. How many significant digits are in the resulting sum?

(A) 2(B) 3(C) 4(D) 5(E) 7

18. A disk of radius 75.0 cm makes 3.5 revolutions when coming to rest in 2.50 s. What was the initial angular speed of the disk?

(A) 1.40 rad/s(B) 6.60 rad/s(C) 8.80 rad/s(D) 13.2 rad/s(E) 17.6 rad/s

19. An ideal gas at a temperature of 100 ºC has 3.0 moles of particles enclosed in a 5.0 L container. Which one of the following choices best represents the pressure of the gas?

(A) 4.99 × 10⁵ Pa(B) 1.86 × 10⁶ Pa(C) 5.02 × 10⁶ Pa(D) 5.05 × 10⁷ Pa(E) 1.88 × 10⁸ Pa

20. An object appears green when ideal cyan light shines on it. If ideal yellow light were to shine on the object, which one of the following choices identifies the color(s) that the object could appear?

(A) only red(B) only yellow(C) only green or black(D) only yellow or green(E) only yellow, green, or red

21. The change in linear momentum of an object is always in the same direction as the

(A) velocity of the object.
(B) displacement of the object.
(C) average speed of the object.
(D) average velocity of the object.
(E) average acceleration of the object.

22. A large swimming pool is filled with a liquid having a density of 5.00 × 10² kg/m³. A person wants to see what happens if she jumps into the deep end of the pool (3.0 meters deep). Which one of the following choices correctly identifies what will happen to the person? Assume that the person does not try to move their arms or legs until discovering what happens after equilibrium is established.

(A) The person will float with much more than 50% of their body’s volume above the liquid’s surface.
(B) The person will float with approximately 50% of their body’s volume above the liquid’s surface.
(C) The person will float with much less than 50% of their body’s volume above the liquid’s surface.
(D) The person will sink but remain off the bottom of the pool.
(E) The person will sink to the pool’s bottom.

23. A 1500 kg car and a 6000 kg truck have a perfectly inelastic collision on a street. Which one of the following choices correctly identifies the object(s) that lose kinetic energy from the impact?

(A) Neither object loses kinetic energy.
(B) Only the car loses kinetic energy.
(C) Only the truck loses kinetic energy.
(D) Both the car and truck lose kinetic energy.
(E) The answer cannot be determined without more information.

24. What condition must be met for the angular momentum of a system to be constant?

(A) The mechanical energy is constant.
(B) There is no net external force acting on the system.
(C) The system is in static equilibrium.
(D) There is no net external torque acting on the system.
(E) Only the gravitational force is acting on the system.

25. A box slides with uniform acceleration up an incline. The box has an initial speed of 9.0 m/s and rises vertically 2.60 m before coming to rest. If the angle of the incline is 30°, what is the coefficient of kinetic friction between the box and the incline?

(A) 0.298(B) 0.322(C) 0.372(D) 0.483(E) 0.557

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