 PhysicsBowl 2012 (Part 1) Printer Friendly Version
All Division I students, START HERE.
All Division II students – skip the first 10 questions, begin on #11.
*** Treat g = 10 m/s2 for ALL questions #1 – #50.

1. Which one of the following lengths is the largest? 2. A ray of light passes straight downward through the point labeled B in the diagram shown. The ray reaches a flat mirror placed at an angle θ to the horizontal as shown. Which one of the locations labeled in the figure best represents the point through which the ray reflected from the mirror will pass?
3. Which one of the following choices best represents the value of the speed of light using units of miles/week?
4. The wave speed is 20.0 m/s for waves traveling on a string tied at both ends. If sinusoidal waves with a frequency of 2.00 Hz are traveling on this string, which one of the following choices best represents the period of these waves?
5. A solid rectangular box is measured to have length L = 13.34 cm, width W = 8.45 cm, and height H = 3.36 cm . Which one of the following choices best represents the volume of the box using proper significant digits?
6. Electromagnetic radiation travels through vacuum with a wavelength of 400 nm. Which one of the following choices best describes this type of radiation?

The next two questions share the same information Base your answers to questions 7 and 8 on the information and diagram below.

 An object of mass 5.00 kg moves only to the right along the +x-axis. During some time interval, the object’s speed is increased from 4.00 m/sec to 8.00 m/s with a constant acceleration of 2.00 m/s2.

7. What is the net force acting on the object during the time interval of the acceleration?
8. Through what distance does the object move during the time interval of the acceleration?

9. A constant current of 4.0 A through a light bulb results in a power of 24.0 W associated with the bulb. Which one of the following choices best represents the resistance of the light bulb? 10. A string of negligible mass connects an object of mass M = 10 kg to the ceiling of an elevator. The elevator experiences a constant downward acceleration of magnitude 6.0 m/s2. Let T represent the magnitude of the force by the string (tension) acting on the mass M, let G represent the magnitude of the gravitational force by the Earth acting on the mass M, and let F represent the magnitude of the net force acting on the mass M. Which one of the following choices describes the relationships between these forces?

All Division 01 students, continue to question #40.
All Division 02 students, START HERE. Numbers 1 – 10 on your answer sheet should be blank. Your first answer should be for #11. *** Treat ⁄ for ALL questions #1 – #50. 11. A girl twirls a small mass connected to the end of a string counterclockwise in a horizontal circle above her head. The figure shows an outline of the mass’s path viewed from above the twirling mass. If the girl needs the mass to pass through the point labeled P in the figure, at which lettered point on the path should she let go of the string?
12. Which one of the following quantities is a scalar quantity?
13. Approximately how many electrons must be removed from an electrically neutral object to give it a net charge of Q = +1.00 C? 14. For the circuit shown to the left, what is the equivalent resistance? Assume that all wires are ideal, the battery has no internal resistance, and all three resistors have identical resistance R.
15. Which one of the following phases of the lunar cycle immediately follows “First Quarter”? 16. A constant force F = 50 N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M = 15 kg. Which one of the following choices best represents the work done by the force F on the box for the motion?

Question 17 Base your answer to question 17 on the information and diagram below.

 A mass moves according to the graph of position as a function of time shown below. 17. Which one of the following choices correctly represents the time instants or time interval for which the instantaneous velocity of the mass is considered always to be negative? Let t represent time.

18. A 1.00 kg object is released from rest near the surface of the Earth. The gravitational force acting on the 1.0 kg object by the Earth does 10.0 J of work on the object as it falls 1.00 m to the ground. Which one of the following choices best represents the amount of work done by the gravitational force acting on the Earth by the 1.00 kg object during the fall?
19. The magnitude of the linear momentum of a 4.00 kg point mass is changed from 6.00 kg(m/s) to 14.0 kg(m/s) in a time interval of 6.00 s. What is the change in the kinetic energy of the mass during this time interval?
20. “Both the position and momentum of an electron cannot be known exactly at the same instant of time.” To whom is this concept attributed?
21. A child’s balloon is filled with pure Xenon gas. This balloon then is released from rest two meters above the ground on Earth. Which one of the following choices best describes the response of the balloon?

22. A girl swings a 4.0 kg mass with a constant speed of 3.24 m/s in a vertically-oriented circle of radius 0.75 m. What is the net force acting on the mass when it is at the lowest point of the circle?
The next two questions share the same information Base your answers to questions 23 and 24 on the information and diagram below.

 A collision of two blocks takes place along a horizontal surface without friction. A block with mass M1 = 3.00 kg  initially moves to the left with speed V1 = 5.00 m/s when it hits a block with mass M2 = 5.00 kg initially moving to the right with speed V2 = 2.00 m/s. After colliding, the block with mass M1 is moving to the right with speed 1.00 m/s.

23. Which of the blocks underwent a larger magnitude of acceleration during the collision?

24. What is the speed of the block with mass M2 after the collision?

25. Which one of the following choices best represents the average angular speed of the hour hand on a standard clock (in units of rad/s)? Related Documents