PhysicsLAB AAPT Quiz
PhysicsBowl 2024 (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.
 
Questions 1 - 2 refer to the following graph depicting the velocity of an object from t = 0 until t = 28 seconds.
 
 
1. The average speed of the object for the twenty-eight second interval is …




 
2. The average velocity of the object for the twenty-eight second interval is …
 
3. A door is hinged on one side, and a force of 15 N is applied perpendicular to the door at a distance of 0.8 m from the hinge. How much torque is applied by this force to the door?
 
4. A rock is dropped from a cliff in a canyon. Neglecting air resistance, as it falls, which of the following statements about its energy is true, according to the law of conservation of energy?




 
5. Two people on ice skates are initially at rest while facing one another. One person has a mass of 60 kg and the other 40 kg. They push off each other and move in opposite directions. If the 60-kg skater moves with a speed of 2.0 m/s, what is the speed of the 40-kg skater, assuming no external forces are acting?
 
6. What is the conversion factor between km/hr2 and m/s2?
 
7. The radius of the Earth is 3963 miles. What is the surface area of the Earth in square meters?
 
8. A hockey puck is given an initial speed of 10.0 m/s. It slides 50.0 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?
 
9. A wooden crate is placed on a flat surface, and three forces act on it: F1 is applied horizontally to the right, F2 is applied horizontally to the left, and F3 is applied vertically down. Consider the following statements for this situation:
 
  • Statement I: If F1>F2, the crate with move to the right.
  • Statement II: The net force acting on the crate is the vector sum of F1, F2, & F3.
  • Statement III: If F3> F1+ F2, the crate will move upward.
 
Which statement(s) accurately describe(s) the result of the forces acting on the crate?
 
10. A rock is thrown vertically upward with an initial velocity of 20.0 m/s. What is the maximum height the rock will reach, assuming no air resistance?
 
11. Two sound waves have the same frequency. One of the sound waves is traveling in air at 331 𝑚/𝑠 and the other is traveling in water at 1450 𝑚/𝑠. What is the ratio of the wavelength of the sound in water to the wavelength of sound in air?
 
12. When they are fishing, pelicans tuck their wings and dive straight down. Assume a pelican starts its dive from a height of 16.0 m above a fish at the surface of the water and cannot change its path once committed. If it takes a fish 0.20 s to perform evasive action, at what minimum height must it spot the pelican to escape? Assume the fish is at the surface of the water.
 
13. A small cart with a mass of 50 g is rolling on a frictionless track with a velocity of +10 𝑚/𝑠 . It then has a head-on, elastic collision with a stationary cart of mass 100 g. What is the speed of each cart immediately after the collision? The 50-g cart speed is listed first followed by the 100-g cart speed in all choices.
 
14. The work of which of the following scientists is most closely associated with the discovery of the constancy of the speed of light?




 
15. A pendulum is constructed from a uniform rod pivoted at its top end and a circular disk attached near the free end as shown in Figure 1.
 
 
Figure 2 shows the same pendulum with the disk now attached closer to the pivot. Use the following statements to determine the resulting change in the period of the pendulum.
 
  • Statement 1: The moment of inertia of the pendulum about the pivot decreases.
  • Statement 2: The torque exerted by gravity on the pendulum about the pivot decreases.




 
16. Which recent experiment in physics has provided further evidence supporting the existence of dark matter?




 
17. At a construction site, a bulldozer drags a log weighing 500 N along a rough, horizontal surface. The cable attached to the log makes an angle of 30.0° with the ground. The coefficient of static friction between the log and the ground is 0.500. What minimum tension is required in the cable for the log to begin to move?
 
18. A 432-Hz tuning fork is the lowest frequency tuning fork that can produce resonance when held over one end a certain plastic tube open at both ends. When one end of this tube is closed, which of the following tuning fork frequencies would produce resonance when held over the open end?
 
19. Halley's Comet was last visible on Earth in 1986 and will be visible again in 2061. As it travels on its elliptical orbit around the sun, the speed of Halley’s Comet…




 
Questions #20 through #22 are based on the following situation: A bicycle and its rider have a combined mass of 80.0 kg. The cyclist can coast down a 6.0º hill, and because of air resistance, they are limited to a constant speed of 6.0 𝑘𝑚/ℎ𝑟 . The vertical height of the hill is 120 m.
 
20. What total distance does the cyclist ride to climb this hill?
 
21. How much work against gravity must the cyclist do to climb this hill?
 
22. If each complete revolution of the pedals moves the bike 4.9 m along its path uphill, calculate the average force that must be exerted on the pedals, tangent to their circular path. Neglect work done by friction and other losses. The pedals turn in a circle of diameter 34 cm.
 
23. A solid, uniform disk and a solid, uniform sphere are placed on a ramp where they can roll without slipping. The disk is released a distance d from the bottom of the ramp and achieves a center-of-mass speed v upon reaching the bottom. From what distance (also measured from the bottom of the ramp) should the sphere be released to attain the same center-of-mass speed v at the bottom?
 
24. An ideal gas undergoes an isothermal process. Which of the following statements about the change in internal energy (ΔU) for the gas and heat (Q) is true during this process?




 
25. An Atwood’s machine has two masses m1 and m2 connected by a light string passing over a pulley. If m1=5kg and m2=7kg, and the pulley has a radius of 0.1m, what is the tension in the string?
 



 
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