# Physical Setting 13 August 2002

Physical Setting 13 August 2002 Questions Answer Keys

The University of the State of New York
Regents High School Examination
Physical Setting
Physics
Tuesday, August 13, 2002 — 12:30 to 3:30 p.m., only

Directions (1–30): For each statement or question, write on the separate anwser sheet, the number of the word or expression that, of those given, best completes the statement or answers the question.

1. A net force of 25 newtons is applied horizontally to a 10.-kilogram block resting on a table. What is the magnitude of the acceleration of the block?

• (1) 0.0 m/s2
• (2) 0.26 m/s2
• (3) 0.40 m/s2
• (4) 2.5 m/s2

2. The speed of a car is increased uniformly from 20. meters per second to 30. meters per second in 4.0 seconds. The magnitude of the car’s average acceleration in this 4.0-second interval is

• (1) 0.40 m/s2
• (2) 2.5 m/s2
• (3) 10 m/s2
• (4) 13 m/s2

3. A roller coaster, traveling with an initial speed of 15 meters per second, decelerates uniformly at –7.0 meters per second2 to a full stop. Approximately how far does the roller coaster travel during its deceleration?

• (1) 1.0 m
• (2) 2.0 m
• (3) 16 m
• (4) 32 m

4. The diagram below represents a 0.40-kilogram stone attached to a string. The stone is moving at a constant speed of 4.0 meters per second in a horizontal circle having a radius of 0.80 meter.

The magnitude of the centripetal acceleration of the stone is

• (1) 0.0 m/s2
• (2) 2.0 m/s2
• (3) 5.0 m/s2
• (4) 20. m/s2

5. In the diagram below, a box is at rest on an inclined plane.

Which vector best represents the direction of the normal force acting on the box?

• (1) A
• (2) B
• (3) C
• (4) D

Note that question 6 has only three choices.

6. If the magnitude of the gravitational force of Earth on the Moon is F, the magnitude of the gravitational force of the Moon on Earth is

• (1) smaller than F
• (2) larger than F
• (3) equal to F

7. Which term represents a scalar quantity?

• (1) distance
• (2) displacement
• (3) force
• (4) weight

8. A block weighing 15 newtons is pulled to the top of an incline that is 0.20 meter above the ground, as shown below.

If 4.0 joules of work are needed to pull the block the full length of the incline, how much work is done against friction?

• (1) 1.0 J
• (2) 0.0 J
• (3) 3.0 J
• (4) 7.0 J

9. A 1.0-kilogram rubber ball traveling east at 4.0 meters per second hits a wall and bounces back toward the west at 2.0 meters per second. Compared to the kinetic energy of the ball before it hits the wall, the kinetic energy of the ball after it bounces off the wall is

• (1) one-fourth as great
• (2) one-half as great
• (3) the same
• (4) four times as great

Note that questions 10 and 11 have only three choices.

10. As a spring is stretched, its elastic potential energy

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

11. An electroscope is a device with a metal knob, a metal stem, and freely hanging metal leaves used to detect charges. The diagram below shows a positively charged leaf electroscope.

As a positively charged glass rod is brought near the knob of the electroscope, the separation of the electroscope leaves will

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

12. A catapult with a spring constant of 1.0 × 104 newtons per meter is required to launch an airplane from the deck of an aircraft carrier. The plane is released when it has been displaced 0.50 meter from its equilibrium position by the catapult. The energy acquired by the airplane from the catapult during takeoff is approximately

• (1) 1.3 × 103 J
• (2) 2.0 × 104 J
• (3) 2.5 × 103 J
• (4) 1.0 × 104 J

13. A 10.-ohm resistor and a 20.-ohm resistor are connected in series to a voltage source. When the current through the 10.-ohm resistor is 2.0 amperes, what is the current through the 20.-ohm resistor?

• (1) 1.0 A
• (2) 2.0 A
• (3) 0.50 A
• (4) 4.0 A

14. In the circuit diagram below, what are the correct readings of voltmeters V1 and V2?

15. A physics student notices that 4.0 waves arrive at the beach every 20. seconds. The frequency of these waves is

• (1) 0.20 Hz
• (2) 5.0 Hz
• (3) 16 Hz
• (4) 80. Hz

16. An electric guitar is generating a sound of constant frequency. An increase in which sound wave characteristic would result in an increase in loudness?

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

17. The diagram below shows two points, A and B, on a wave train.

How many wavelengths separate point A and point B?

• (1) 1.0
• (2) 1.5
• (3) 3.0
• (4) 0.75

18. In a demonstration, a vibrating tuning fork causes a nearby second tuning fork to begin to vibrate with the same frequency. Which wave phenomenon is illustrated by this demonstration?

• (1) the Doppler effect
• (2) nodes
• (3) resonance
• (4) interference

19. The diagram below shows wave fronts spreading into the region behind a barrier.

Which wave phenomenon is represented in the diagram?

• (1) reflection
• (2) refraction
• (3) diffraction
• (4) standing waves

20. The diagram below represents the wave pattern produced by two sources located at points A and B.

Which phenomenon occurs at the intersections of the circular wave fronts?

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

21. How much work is required to move a single electron through a potential difference of 100. volts?

• (1) 1.6 × 10–21 J
• (2) 1.6 × 10–19 J
• (3) 1.6 × 10–17 J
• (4) 1.0 × 102 J

22. An object can not have a charge of

• (1) 3.2 × 10–19 C
• (2) 4.5 × 10–19 C
• (3) 8.0 × 10–19 C
• (4) 9.6 × 10–19 C

23. After electrons in hydrogen atoms are excited to the n = 3 energy state, how many different frequencies of radiation can be emitted as the electrons return to the ground state?

• (1) 1
• (2) 2
• (3) 3
• (4) 4

24. What type of nuclear force holds the protons and neutrons in an atom together?

• (1) a strong force that acts over a short range
• (2) a strong force that acts over a long range
• (3) a weak force that acts over a short range
• (4) a weak force that acts over a long range

25. Which is an acceptable unit for impulse?

• (1) N•m
• (2) J/s
• (3) J•s
• (4) kg•m/s

26. The centers of two 15.0-kilogram spheres are separated by 3.00 meters. The magnitude of the gravitational force between the two spheres is approximately

• (1) 1.11 × 10–10 N
• (2) 3.34 × 10–10 N
• (3) 1.67 × 10–9 N
• (4) 5.00 × 10–9 N

27. During a collision, an 84-kilogram driver of a car moving at 24 meters per second is brought to rest by an inflating air bag in 1.2 seconds. The magnitude of the force exerted on the driver by the air bag is approximately

• (1) 7.0 × 101 N
• (2) 8.2 × 102 N
• (3) 1.7 × 103 N
• (4) 2.0 × 103 N

28. An apple weighing 1 newton on the surface of Earth has a mass of approximately

• (1) 1 × 10–1 kg
• (2) 1 × 100 kg
• (3) 1 × 101 kg
• (4) 1 × 102 kg

29. In raising an object vertically at a constant speed of 2.0 meters per second, 10. watts of power is developed. The weight of the object is

• (1) 5.0 N
• (2) 20. N
• (3) 40. N
• (4) 50. N

30. Which diagram best represents magnetic flux lines around a bar magnet?