 PhysicsBowl 2018 (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 in ALL problems, #1-#50.

1. A quick Google search reveals that your phone operates at a frequency of 850 x 106 Hz. Which of the following choices best represents this frequency using metric prefixes?
2. A standard metal electroscope is positively charged. A person that is grounded (neutral charge) then touches the top portion of the electroscope with their finger. Which one of the following choices most correctly explains what happens when the finger touches the electroscope?

3. Which of the following is NOT a vector quantity?
4. A ball is thrown vertically downward with an initial speed of 12.0 m/s from a height of 10.0 m above the ground. Ignoring air resistance, what is the speed of the ball when it reaches the ground?
5. A particle travels at a constant speed around a circular path of radius R. If the particle makes one complete trip around the entire circle, what is the magnitude of the displacement for this trip?
6. What temperature on the Kelvin scale is equivalent to 37o Celsius?
7. What is the percent uncertainty in the measurement 2.54 ± 0.16 cm?
8. An Olympic bobsled needs to negotiate a 100 m radius turn at 35 m/s without skidding. What minimum banking angle of the turn is needed for this to happen? (Ignore friction.)
9. The mean diameter of the Earth is 12.76 x 103 km. What is the surface area of the Earth in m2?
10. A 2.0 m long organ pipe which is open at both ends resonates at its fundamental frequency. Neglecting any end effects, what wavelength is formed by this pipe in this mode of vibration?
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. In a classroom demonstration, a teacher discussing the air in the room as an ideal gas slides a solid barrier of negligible thickness into place, cutting the room into two equal-sized volumes. What is the air pressure for the portion of the room in which the teacher is standing, assuming the original pressure in the whole room was P? Treat the room as a sealed container. 12. What is the equivalent resistance in the circuit that is shown at right?
13. An x-ray photon collides with a free electron, and the photon is scattered. During the collision:

14. Three identical wood blocks are raced across three different flat surfaces, with the faces of the blocks on the surfaces. Each block is pulled horizontally with the same force F from one edge by a light string attached to the block.

• Block 1 is pulled on a frictionless surface.
• Block 2 is pulled on a surface with a nonzero kinetic friction coefficient, and a zero static friction coefficient.
• Block 3 is pulled on a surface with a nonzero static friction coefficient, and the same kinetic coefficient as for Block 2, where µk < µs.

If each block starts from rest and is pulled until traveling the same fixed horizontal distance, which of the following choices correctly ranks the times (t1, t2, t3) it takes for each block to traverse the distance?
15. A sample of ideal gas is in a container at a temperature of 100 oC and a pressure of 2.5 atm. If the volume of the container is 0.025 m3, approximately how many molecules of gas are in the container?
16. Determining the area under an object’s acceleration vs. time graph for a fixed time interval will calculate

17. A thick-walled metal pipe of length 20.0 cm has an inside diameter of 2.00 cm and an outside diameter of 2.40 cm. What is the total surface area of the pipe, including the inside, outside, and ends, in cm2? 18. The circuit shown contains a battery with an internal resistance, r, connected to a variable resistor. When the resistance of the variable resistor is increased, which of the following statements is true?

19. Which of the following could produce an enlarged but inverted image of a real object?

20. A frictionless, solid disk pulley has a mass of 7.07 kg, a radius of 66.0 cm, and is free to rotate vertically about an axle. A rope is wrapped around the disk, a 1.53 kg mass is attached to the end of the rope, and the mass is allowed to fall vertically. What is the angular acceleration of the pulley?
The next two questions share the same information Base your answers to questions 21 and 22 on the information and diagram below.

 A small object is released from rest and reaches the ground in a time of 2.50 s. Neglect air resistance.
21. With what speed does the object reach the ground?
22. From what height above the ground was the object released?

23. Induced electric currents due to changing magnetic flux can be explained using which one of the following laws?
24. A small ball is thrown at an angle of 30.0o above the horizontal ground with a speed of 20.0 m/s. What is the maximum height above the launch point to which the ball rises? Ignore air resistance.
25. In a circuit, the flow of electrons in a horizontal wire produces a constant current of 3.20 A for a time of 3.0 hours. Which of the following choices best represents the number of electrons that pass through a vertical cross-section of wire during this time? Related Documents