PhysicsLAB AAPT Quiz
PhysicsBowl 2016 (Part 2)

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26. A 10.0 kg mass moves to the right at 8.00 m/s. A 5.0 kg mass moves to the left at 7.00 m/s. With what speed does the center of mass of this two-mass system move?
27. A tuning fork of frequency f is placed over a long tube closed at one end producing the third lowest frequency standing wave for the tube. What frequency tuning fork would be needed to produce the fourth lowest frequency standing wave?
28. Recent excitement in the physics community came from the February, 2016 announcement from LIGO that

29. A ray of light is incident onto a thin glass lens as shown. Which one of the following arrows best indicates the path of the refracted ray?
30. A scientist wishes to compute the amount of energy necessary to melt a known mass of a solid sample. Which quantity associated with the sample would the scientist be most interested in knowing?

31. The circuit shown has 4 identical light bulbs connected to an ideal battery. If bulb #2 were removed leaving an open circuit there, what happens to the voltage across both bulb #1 and from Q to X?
32. A mass connected to a string forms a simple pendulum. The mass is released from rest and undergoes simple harmonic motion. Which one of the following choices correctly ranks the magnitude of the tension in the string (T), the gravitational force on the mass (W), and the net force acting on the mass (F) when the mass swings through its lowest point?
33. Given the configuration of three charges: +Q, +Q, and -2Q, which one of the following choices best represents the direction of the electric field at the point P and the sign of the electric potential at P from these charges?
34. The graph shows the magnitude of the linear momentum of two solid objects colliding on the x-axis. Which one of the following statements must be true based on the information provided?

35. Which one of the following choices best describes what it means for an object to be iridescent?

36. On a straight road, a self-driving car races with a robot. The robot accelerates at 8.50 m/s2 until reaching its maximum constant speed of 15.0 m/s. The car accelerates at 5.60 m/s2 until reaching its maximum constant speed of 25.0 m/s. The car and robot start from rest from the same location. What is the maximum distance that the robot leads the car during the race?
The next two questions share the same information Base your answers to questions 37 and 38 on the information and diagram below.

A string is connected to a mechanical oscillator on one end and to a cube-shaped mass, m = 8.0 kg, at the other end as shown. The oscillator vibrates the string with a frequency of f producing the standing wave in the figure on the left.

When the mass is submerged completely in water, the string vibrates in the standing wave pattern shown on the right.

37. What is the value of the ratio for the tension when the mass is submerged in water to the tension when the mass is hanging in air?
38. What is the length of one side of the cube of mass m?

The next two questions share the same information Base your answers to questions 39 and 40 on the information and diagram below.

An object moves in a circle, starting at the top, with initial speed 17.0 m/s. The object’s speed increases uniformly until it has moved counterclockwise through an angle of 55°. The average acceleration for this motion is 9.8 m/s2 directed straight downward.

39. What is the final speed of the object?
40. What is the time for this motion?
All Division 1 students STOP HERE. Your last answer should be for #40. Numbers #41-#50 should remain blank for Division 1 students.
All Division 2 students continue to Questions #41 – #50.

41. A small object is launched 30° above the horizontal from a height of 10.0 m above the ground. If the initial speed of the object is 15.0 m/s, at what angle below the horizontal is the object moving when it reaches the ground? Ignore air resistance.
42. An object (which points upward) is placed 21.0 cm from a converging lens of focal length 18.0 cm. Which one of the following choices is true about the image formed by the lens?

43. A uniform beam connected to a wall at the hinge is in static equilibrium as shown. The cable connected to the beam is massless. What are the directions of the horizontal and vertical components of force acting at the pivot on the beam?
44. A proton moves in a circular orbit in a uniform magnetic field, B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic force during its motion, what is the ratio of the speed of the helium to the speed of the proton?
45. Light of wavelength 250 nm shines onto a metallic surface. It is known that the electrons ejected from the surface range in speed as 0 ≤ v ≤ 4.85 × 10 5 m/s. What is the work function of the surface?
46. Two spherical, non-rotating planets, X and Y, have the same uniform density 𝜌. Planet X has twice the radius of Planet Y. Let vX and vY represent the escape speed at the surfaces of Planet X and Planet Y, respectively. What is the ratio of vX:vY?
47. Two small loops of wire are located close to a wire with conventional current directed up the page. A scientist then moves the loops away from the current as shown. What is the orientation of the conventional current in each loop while this occurs?
48. From a given state of P, V, and T for an ideal gas, which one of the following reversible processes has the most heat associated with it?

49. John is at rest on a platform that he measures to be 500 m long on the x-axis. He then sees a spaceship moving along the x-axis with a speed of 1.80 × 108 m/s as it crosses the length of the platform. Sitting in her chair, the spaceship's pilot measures the time it takes her to cross the platform. What type of time interval does she measure and what value does she obtain?

50. A uniform stick of mass M and length L is fixed to rotate about a frictionless pivot located L/3 from one end. The stick is released from rest incrementally away from being perfectly vertical, resulting in the stick rotating clockwise about its pivot. When the stick is horizontal, what is the tangential speed of the center of mass about the pivot?

All Division 2 students STOP HERE. Your last answer should be for #50.

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