Physical Setting 22 June 2010 Questions Answer Keys

**The University of the State of New York**

Regents High School Examination

Physical Setting

Physics

Tuesday, June 22, 2010 — 9:15 a.m. to 12:15 p.m., only

**Directions (1–30):** For each statement or question, write in your answer booklet the number of the word or expression that, of those given, best completes the statement or answers the question.

**1. A baseball player runs 27.4 meters from the batter’s box to first base, overruns first base by 3.0 meters, and then returns to first base. Compared to the total distance traveled by the player, the magnitude of the player’s total displacement from the batter’s box is**

- (1) 3.0 m shorter
**(2) 6.0 m shorter**- (3) 3.0 m longer
- (4) 6.0 m longer

**2. A motorboat, which has a speed of 5.0 meters per second in still water, is headed east as it crosses a river flowing south at 3.3 meters per second. What is the magnitude of the boat’s resultant velocity with respect to the starting point?**

- (1) 3.3 m/s
**(2) 5.0 m/s**- (3) 6.0 m/s
- (4) 8.3 m/s

**3. A car traveling on a straight road at 15.0 meters per second accelerates uniformly to a speed of 21.0 meters per second in 12.0 seconds. The total distance traveled by the car in this 12.0-second time interval is**

- (1) 36.0 m
- (2) 180. m
**(3) 216 m**- (4) 252 m

**4. A 0.149-kilogram baseball, initially moving at 15 meters per second, is brought to rest in 0.040 second by a baseball glove on a catcher’s hand. The magnitude of the average force exerted on the ball by the glove is**

- (1) 2.2 N
- (2) 2.9 N
- (3) 17 N
**(4) 56 N**

**5. Which body is in equilibrium? **

- (1) a satellite moving around Earth in a circular orbit
- (2) a cart rolling down a frictionless incline
- (3) an apple falling freely toward the surface of Earth
**(4) a block sliding at constant velocity across a tabletop**

**6. As shown in the diagram below, a student standing on the roof of a 50.0-meter-high building kicks a stone at a horizontal speed of 4.00 meters per second.**

How much time is required for the stone to reach the level ground below? [Neglect friction.]

**(1) 3.19 s**- (2) 5.10 s
- (3) 10.2 s
- (4) 12.5 s

**7. On the surface of Earth, a spacecraft has a mass of 2.00 × 10 ^{4} kilograms. What is the mass of the spacecraft at a distance of one Earth radius above Earth’s surface?**

- (1) 5.00 × 10
^{3}kg **(2) 2.00 × 10**^{4}kg- (3) 4.90 × 10
^{4}kg - (4) 1.96 × 10
^{5}kg

**8. A student pulls a 60.-newton sled with a force having a magnitude of 20. newtons. What is the magnitude of the force that the sled exerts on the student?**

**(1) 20. N**- (2) 40. N
- (3) 60. N
- (4) 80. N

**9. The data table below lists the mass and speed of four different objects.**

Which object has the greatest inertia?

- (1) A
- (2) B
- (3) C
**(4) D**

**10. The diagram below shows a horizontal 12-newton force being applied to two blocks, A and B, initially at rest on a horizontal, frictionless surface. Block A has a mass of 1.0 kilogram and block B has a mass of 2.0 kilograms.**

The magnitude of the acceleration of block B is

- (1) 6.0 m/s
^{2} - (2) 2.0 m/s
^{2} - (3) 3.0 m/s
^{2} **(4) 4.0 m/s**^{2}

**11. A ball is thrown vertically upward with an initial velocity of 29.4 meters per second. What is the maximum height reached by the ball? [Neglect friction.]**

- (1) 14.7 m
- (2) 29.4 m
**(3) 44.1 m**- (4) 88.1 m

**12. The diagram below represents a mass, m, being swung clockwise at constant speed in a horizontal circle.**

At the instant shown, the centripetal force acting on mass m is directed toward point

- (1) A
- (2) B
**(3) C**- (4) D

**13. A 3.1-kilogram gun initially at rest is free to move. When a 0.015-kilogram bullet leaves the gun with a speed of 500. meters per second, what is the speed of the gun?**

- (1) 0.0 m/s
**(2) 2.4 m/s**- (3) 7.5 m/s
- (4) 500. m/s

**14. Four projectiles, A, B, C, and D, were launched from, and returned to, level ground. The data table below shows the initial horizontal speed, initial vertical speed, and time of flight for each projectile.**

Which projectile traveled the greatest horizontal distance? [Neglect friction.]

- (1) A
- (2) B
- (3) C
**(4) D**

**15. A wound spring provides the energy to propel a toy car across a level floor. At time t _{ i} ,the car is moving at speed vi across the floor and the spring is unwinding, as shown below. At time t _{f} , the spring has fully unwound and the car has coasted to a stop.**

Which statement best describes the transformation of energy that occurs between times t _{i} and t _{f} ?

- (1) Gravitational potential energy at t
_{i}is converted to internal energy at t_{f}. - (2) Elastic potential energy at t
_{i}is converted to kinetic energy at t_{f}. **(3) Both elastic potential energy and kinetic energy at t**_{i}are converted to internal energy at t_{f }.- (4) Both kinetic energy and internal energy at t
_{i}are converted to elastic potential energy at t_{f}.

**16. A 75-kilogram bicyclist coasts down a hill at a constant speed of 12 meters per second. What is the kinetic energy of the bicyclist?**

- (1) 4.5 × 10
^{2}J - (2) 9.0 × 10
^{2}J **(3) 5.4 × 10**^{3}J- (4) 1.1 × 10
^{4}J

**17. The diagram below represents a 155-newton box on a ramp. Applied force F causes the box to slide from point A to point B.**

What is the total amount of gravitational potential energy gained by the box?

- (1) 28.4 J
**(2) 279 J**- (3) 868 J
- (4) 2740 J

**18. An electric heater operating at 120. volts draws 8.00 amperes of current through its 15.0 ohms of resistance. The total amount of heat energy produced by the heater in 60.0 seconds is**

- (1) 7.20 × 10
^{3}J **(2) 5.76 × 10**^{4}J- (3) 8.64 × 10
^{4 }J - (4) 6.91 × 10
^{6}J

**19. Magnetic fields are produced by particles that are**

**(1) moving and charged**- (2) moving and neutral
- (3) stationary and charged
- (4) stationary and neutral

**20. A charge of 30. coulombs passes through a 24-ohm resistor in 6.0 seconds. What is the current through the resistor?**

- (1) 1.3 A
**(2) 5.0 A**- (3) 7.5 A
- (4) 4.0 A

**21. What is the magnitude of the electrostatic force between two electrons separated by a distance of 1.00 × 10– ^{8} meter?**

- (1) 2.56 × 10–
^{22}N - (2) 2.30 × 10–
^{20}N **(3) 2.30 × 10–**^{12}N- (4) 1.44 × 10–
^{1 }N

**22. The diagram below represents the electric field surrounding two charged spheres, A and B.**

What is the sign of the charge of each sphere?

- (1) Sphere A is positive and sphere B is negative.
**(2) Sphere A is negative and sphere B is positive.**- (3) Both spheres are positive.
- (4) Both spheres are negative

**23. Which circuit has the smallest equivalent resistance?**

Base your answers to questions 24 through 26 on the information and diagram below.

A longitudinal wave moves to the right through a uniform medium, as shown below. Points A, B, C, D, and E represent the positions of particles of the medium.

**24. Which diagram best represents the motion of the particle at position C as the wave moves to the right?**

**25. The wavelength of this wave is equal to the distance between points**

- (1) A and B
**(2) A and C**- (3) B and C
- (4) B and E

**26. The energy of this wave is related to its**

**(1) amplitude**- (2) period
- (3) speed
- (4) wavelength

**27. A ray of monochromatic yellow light ( f = 5.09 × 10 ^{14} Hz) passes from water through flint glass and into medium X, as shown below.**

The absolute index of refraction of medium X is

- (1) less than 1.33
- (2) greater than 1.33 and less than 1.52
- (3) greater than 1.52 and less than 1.66
**(4) equal to 1.66**

**28. A light ray traveling in air enters a second medium and its speed slows to 1.71 × 10 ^{8} meters per second. What is the absolute index of refraction of the second medium?**

- (1) 1.00
- (2) 0.570
**(3) 1.75**- (4) 1.94?

**29. Playing a certain musical note on a trumpet causes the spring on the bottom of a nearby snare drum to vibrate. This phenomenon is an example of**

**(1) resonance**- (2) refraction
- (3) reflection
- (4) diffraction

**30. In a vacuum, all electromagnetic waves have the same**

**(1) speed**- (2) phase
- (3) frequency
- (4) wavelength

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