# Physical Setting 27 January 2005

Physical Setting 27 January 2005 Questions Answer Keys

The University of the State of New York
Regents High School Examination
Physical Setting
Physics
Thursday, January 27, 2005 — 9:15 a.m. to 12:15 p.m., only

1. A ball dropped from rest falls freely until it hits the ground with a speed of 20 meters per second. The time during which the ball is in free fall is approximately

• (1) 1 s
• (2) 2 s
• (3) 0.5 s
• (4) 10 s

2. In a 4.0-kilometer race, a runner completes the first kilometer in 5.9 minutes, the second kilometer in 6.2 minutes, the third kilometer in 6.3 minutes, and the final kilometer in 6.0 minutes. The average speed of the runner for the race is approximately

• (1) 0.16 km/min
• (2) 0.33 km/min
• (3) 12 km/min
• (4) 24 km/min

3. A golf ball is hit with an initial velocity of 15 meters per second at an angle of 35 degrees above the horizontal. What is the vertical component of the golf ball’s initial velocity?

• (1) 8.6 m/s
• (2) 9.8 m/s
• (3) 12 m/s
• (4) 15 m/s

4. In the diagram below, a 60.-kilogram rollerskater exerts a 10.-newton force on a 30.-kilogram rollerskater for 0.20 second. What is the magnitude of the impulse applied to the 30.-kilogram rollerskater?

• (1) 50. N•s
• (2) 2.0 N•s
• (3) 6.0 N•s
• (4) 12 N•s

Note that question 5 has only three choices.

5. In the diagram below, a 10.-kilogram block is at rest on a plane inclined at 15° to the horizontal. As the angle of the incline is increased to 30.°, the mass of the block will

• (1) decrease
• (2) increase
• (3) remain the same

6. If the direction of a moving car changes and its speed remains constant, which quantity must remain the same?

• (1) velocity
• (2) momentum
• (3) displacement
• (4) kinetic energy

7. Two carts are pushed apart by an expanding spring, as shown in the diagram below. If the average force on the 1-kilogram cart is 1 newton, what is the average force on the 2-kilogram cart?

• (1) 1 N
• (2) 0.0 N
• (3) 0.5 N
• (4) 4 N

8. A lab cart is loaded with different masses and moved at various velocities. Which diagram shows the cartmass system with the greatest inertia? 9. The diagram below shows a sled and rider sliding down a snow-covered hill that makes an angle of 30.° with the horizontal. Which vector best represents the direction of the normal force, FN, exerted by the hill on the sled? 10. The diagram below shows two pulses of equal amplitude, A, approaching point P along a uniform string. When the two pulses meet at P, the vertical displacement of the string at P will be

• (1) A
• (2) 2A
• (3) 0
• (4) A/2

11. The energy of a water wave is most closely related to its

• (1) frequency
• (2) wavelength
• (3) period
• (4) amplitude

12. Which form(s) of energy can be transmitted through a vacuum?

• (1) light, only
• (2) sound, only
• (3) both light and sound
• (4) neither light nor sound

13. A tuning fork vibrating in air produces sound waves. These waves are best classified as

• (1) transverse, because the air molecules are vibrating parallel to the direction of wave motion
• (2) transverse, because the air molecules are vibrating perpendicular to the direction of wave motion
• (3) longitudinal, because the air molecules are vibrating parallel to the direction of wave motion
• (4) longitudinal, because the air molecules are vibrating perpendicular to the direction of wave motion

14. A student in a band notices that a drum vibrates when another instrument emits a certain frequency note. This phenomenon illustrates

• (1) reflection
• (2) resonance
• (3) refraction
• (4) diffraction

15. Which quantity is equivalent to the product of the absolute index of refraction of water and the speed of light in water?

• (1) wavelength of light in a vacuum
• (2) frequency of light in water
• (3) sine of the angle of incidence
• (4) speed of light in a vacuum

16. Radio waves and gamma rays traveling in space have the same

• (1) frequency
• (2) wavelength
• (3) period
• (4) speed

17. The spreading of a wave into the region behind an obstruction is called

• (1) diffraction
• (2) absorption
• (3) reflection
• (4) refraction

18. The diagram below represents a wave moving toward the right side of this page Which wave shown below could produce a standing wave with the original wave? 19. A train sounds a whistle of constant frequency as it leaves the train station. Compared to the sound emitted by the whistle, the sound that the passengers standing on the platform hear has a frequency that is

• (1) lower, because the sound-wave fronts reach the platform at a frequency lower than the frequency at which they are produced
• (2) lower, because the sound waves travel more slowly in the still air above the platform than in the rushing air near the train
• (3) higher, because the sound-wave fronts reach the platform at a frequency higher than the frequency at which they are produced
• (4) higher, because the sound waves travel faster in the still air above the platform than in the rushing air near the train

20. What is the gravitational potential energy with respect to the surface of the water of a 75.0- kilogram diver located 3.00 meters above the water?

• (1) 2.17 × 104 J
• (2) 2.21 × 103 J
• (3) 2.25 × 102 J
• (4) 2.29 × 101 J

21. A 60.0-kilogram runner has 1920 joules of kinetic energy. At what speed is she running?

• (1) 5.66 m/s
• (2) 8.00 m/s
• (3) 32.0 m/s
• (4) 64.0 m/s

22. The diagram below shows points A, B, and C at or near Earth’s surface. As a mass is moved from A to B, 100. joules of work are done against gravity What is the amount of work done against gravity as an identical mass is moved from A to C?

• (1) 100. J
• (2) 173 J
• (3) 200. J
• (4) 273 J

23. When a force moves an object over a rough, horizontal surface at a constant velocity, the work done against friction produces an increase in the object’s

• (1) weight
• (2) momentum
• (3) potential energy
• (4) internal energy

24. A motor used 120. watts of power to raise a 15-newton object in 5.0 seconds. Through what vertical distance was the object raised?

• (1) 1.6 m
• (2) 8.0 m
• (3) 40. m
• (4) 360 m

25. In an electric field, 0.90 joule of work is required to bring 0.45 coulomb of charge from point A to point B. What is the electric potential difference between points A and B?

• (1) 5.0 V
• (2) 2.0 V
• (3) 0.50 V
• (4) 0.41 V

26. In a flashlight, a battery provides a total of 3.0 volts to a bulb. If the flashlight bulb has an operating resistance of 5.0 ohms, the current through the bulb is

• (1) 0.30 A
• (2) 0.60 A
• (3) 1.5 A
• (4) 1.7 A

Note that question 27 has only three choices.

27. A complete circuit is left on for several minutes, causing the connecting copper wire to become hot. As the temperature of the wire increases, the electrical resistance of the wire

• (1) decreases
• (2) increases
• (3) remains the same

28. A 1.5-volt, AAA cell supplies 750 milliamperes of current through a flashlight bulb for 5.0 minutes, while a 1.5-volt, C cell supplies 750 milliamperes of current through the same flashlight bulb for 20. minutes. Compared to the total charge transferred by the AAA cell through the bulb, the total charge transferred by the C cell through the bulb is

• (1) half as great
• (2) twice as great
• (3) the same
• (4) four times as great

29. A 9.0-volt battery is connected to a 4.0-ohm resistor and a 5.0-ohm resistor as shown in the diagram below. What is the current in the 5.0-ohm resistor?

• (1) 1.0 A
• (2) 1.8 A
• (3) 2.3 A
• (4) 4.0 A

30. A 100.-ohm resistor and an unknown resistor are connected in series to a 10.0-volt battery. If the potential drop across the 100.-ohm resistor is 4.00 volts, the resistance of the unknown resistor is

• (1) 50.0 Ω
• (2) 100. Ω
• (3) 150. Ω
• (4) 200. Ω

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