# Physical Setting 13 June 2012

Physical Setting 13 June 2012 Questions Answer Keys

The University of the State of New York
Regents High School Examination
Physical Setting
Physics
Wednesday, June 13, 2012 — 1:15 to 4:15 p.m., only

Directions (1–30): For each statement or question, choose the word or expression that, of those given, best completes the statement or answers the question. Some questions may require the use of the 2006 Edition Reference Tables for Physical Setting/Physics. Record your answers on your separate answer sheet.

Base your answers to questions 1 and 2 on the information below.

In a drill during basketball practice, a player runs the length of the 30.-meter court and back. The player does this three times in 60. seconds.

1. The magnitude of the player’s total displacement after running the drill is

• (1) 0.0 m
• (2) 30. m
• (3) 60. m
• (4) 180 m

2. The average speed of the player during the drill is

• (1) 0.0 m/s
• (2) 0.50 m/s
• (3) 3.0 m/s
• (4) 30. m/s

3. A baseball is thrown at an angle of 40.0° above the horizontal. The horizontal component of the baseball’s initial velocity is 12.0 meters per second. What is the magnitude of the ball’s initial velocity?

• (1) 7.71 m/s
• (2) 9.20 m/s
• (3) 15.7 m/s
• (4) 18.7 m/s

4. A particle could have a charge of

• (1) 0.8 × 10−19 C
• (2) 1.2 × 10−19 C
• (3) 3.2 × 10−19 C
• (4) 4.1 × 10−19 C

5. Which object has the greatest inertia?

• (1) a 15-kg mass traveling at 5.0 m/s
• (2) a 10.-kg mass traveling at 10. m/s
• (3) a 10.-kg mass traveling at 5.0 m/s
• (4) a 5.0-kg mass traveling at 15 m/s

6. A car, initially traveling east with a speed of 5.0 meters per second, is accelerated uniformly at 2.0 meters per second2 east for 10. seconds along a straight line. During this 10.-second interval the car travels a total distance of

• (1) 50. m
• (2) 60. m
• (3) 1.0 × 102 m
• (4) 1.5 × 102 m

7. Which situation describes an object that has no unbalanced force acting on it?

• (1) an apple in free fall
• (2) a satellite orbiting Earth
• (3) a hockey puck moving at constant velocity across ice
• (4) a laboratory cart moving down a frictionless 30.° incline

8. A child riding a bicycle at 15 meters per second accelerates at −3.0 meters per second2 for 4.0 seconds. What is the child’s speed at the end of this 4.0-second interval?

• (1) 12 m/s
• (2) 27 m/s
• (3) 3.0 m/s
• (4) 7.0 m/s

9. An unbalanced force of 40. newtons keeps a 5.0-kilogram object traveling in a circle of radius 2.0 meters. What is the speed of the object?

• (1) 8.0 m/s
• (2) 2.0 m/s
• (3) 16 m/s
• (4) 4.0 m/s

10. A 5.00-kilogram block slides along a horizontal, frictionless surface at 10.0 meters per second for 4.00 seconds. The magnitude of the block’s momentum is

• (1) 200. kg•m/s
• (2) 50.0 kg•m/s
• (3) 20.0 kg•m/s
• (4) 12.5 kg•m/s

11. A 0.50-kilogram puck sliding on a horizontal shuffleboard court is slowed to rest by a frictional force of 1.2 newtons. What is the coefficient of kinetic friction between the puck and the surface of the shuffleboard court?

• (1) 0.24
• (2) 0.42
• (3) 0.60
• (4) 4.1

12. A number of 1.0-newton horizontal forces are exerted on a block on a frictionless, horizontal surface. Which top-view diagram shows the forces producing the greatest magnitude of acceleration of the block?

13. On a small planet, an astronaut uses a vertical force of 175 newtons to lift an 87.5-kilogram boulder at constant velocity to a height of 0.350 meter above the planet’s surface. What is the magnitude of the gravitational field strength on the surface of the planet?

• (1) 0.500 N/kg
• (2) 2.00 N/kg
• (3) 9.81 N/kg
• (4) 61.3 N/kg

14. A car uses its brakes to stop on a level road. During this process, there must be a conversion of kinetic energy into

• (1) light energy
• (2) nuclear energy
• (3) gravitational potential energy
• (4) internal energy

15. Which change decreases the resistance of a piece of copper wire?

• (1) increasing the wire’s length
• (2) increasing the wire’s resistivity
• (3) decreasing the wire’s temperature
• (4) decreasing the wire’s diameter

16. A stone on the end of a string is whirled clockwise at constant speed in a horizontal circle as shown in the diagram below.

Which pair of arrows best represents the directions of the stone’s velocity, v, and acceleration, a, at the position shown?

17. How much work is done by the force lifting a 0.1-kilogram hamburger vertically upward at constant velocity 0.3 meter from a table?

• (1) 0.03 J
• (2) 0.1 J
• (3) 0.3 J
• (4) 0.4 J

18. Two electrons are separated by a distance of 3.00 × 10−6 meter. What are the magnitude and direction of the electrostatic forces each exerts on the other?

• (1) 2.56 × 10−17 N away from each other
• (2) 2.56 × 10−17 N toward each other
• (3) 7.67 × 10−23 N away from each other
• (4) 7.67 × 10−23 N toward each other

19. Which object will have the greatest change in electrical energy

• (1) an electron moved through a potential difference of 2.0 V
• (2) a metal sphere with a charge of 1.0 × 10−9 C moved through a potential difference of 2.0 V
• (3) an electron moved through a potential difference of 4.0 V
• (4) a metal sphere with a charge of 1.0 × 10−9 C moved through a potential difference of 4.0 V

20. The resistance of a circuit remains constant. Which graph best represents the relationship between the current in the circuit and the potential difference provided by the battery?

21. The wavelength of a wave doubles as it travels from medium A into medium B. Compared to the wave in medium A, the wave in medium B has

• (1) half the speed
• (2) twice the speed
• (3) half the frequency
• (4) twice the frequency

22. The watt•second is a unit of

• (1) power
• (2) energy
• (3) potential difference
• (4) electric field strength

23. Which quantity has both a magnitude and a direction?

• (1) energy
• (2) impulse
• (3) power
• (4) work

24. A tuning fork vibrates at a frequency of 512 hertz when struck with a rubber hammer. The sound produced by the tuning fork will travel through the air as a

• (1) longitudinal wave with air molecules vibrating parallel to the direction of travel
• (2) transverse wave with air molecules vibrating parallel to the direction of travel
• (3) longitudinal wave with air molecules vibrating perpendicular to the direction of travel
• (4) transverse wave with air molecules vibrating perpendicular to the direction of travel

25. A 3-ohm resistor and a 6-ohm resistor are connected in parallel across a 9-volt battery. Which statement best compares the potential difference across each resistor?

• (1) The potential difference across the 6-ohm resistor is the same as the potential difference across the 3-ohm resistor.
• (2) The potential difference across the 6-ohm resistor is twice as great as the potential difference across the 3-ohm resistor.
• (3) The potential difference across the 6-ohm resistor is half as great as the potential difference across the 3-ohm resistor.
• (4) The potential difference across the 6-ohm resistor is four times as great as the potential difference across the 3-ohm resistor.

26. A 3.6-volt battery is used to operate a cell phone for 5.0 minutes. If the cell phone dissipates 0.064 watt of power during its operation, the current that passes through the phone is

• (1) 0.018 A
• (2) 5.3 A
• (3) 19 A
• (4) 56 A

27. A monochromatic beam of light has a frequency of 7.69 × 1014 hertz. What is the energy of a photon of this light?

• (1) 2.59 × 10−40 J
• (2) 6.92 × 10−31 J
• (3) 5.10 × 10−19 J
• (4) 3.90 × 10−7 J

28. A 3.00 × 10−9-coulomb test charge is placed near a negatively charged metal sphere. The sphere exerts an electrostatic force of magnitude 6.00 × 10−5 newton on the test charge. What is the magnitude and direction of the electric field strength at this location?

• (1) 2.00 × 104 N/C directed away from the sphere
• (2) 2.00 × 104 N/C directed toward the sphere
• (3) 5.00 × 10−5 N/C directed away from the sphere
• (4) 5.00 × 10−5 N/C directed toward the sphere

29. What is characteristic of both sound waves and electromagnetic waves?

• (1) They require a medium.
• (2) They transfer energy.
• (3) They are mechanical waves.
• (4) They are longitudinal waves.

30. A small object is dropped through a loop of wire connected to a sensitive ammeter on the edge of a table, as shown in the diagram below.

A reading on the ammeter is most likely produced when the object falling through the loop of wire is a

• (1) flashlight battery
• (2) bar magnet
• (3) brass mass
• (4) plastic ruler