# Physical Setting 16 June 2004

Physical Setting 16 June 2004 Questions Answer Keys

The University of the State of New York
Regents High School Examination
Physical Setting
Physics
Wednesday, June 16, 2004 — 1:15 to 4:15 p.m., only

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

1. Velocity is to speed as displacement is to

• (1) acceleration
• (2) time
• (3) momentum
• (4) distance

2. The diagram below shows a resultant vector, R

Which diagram best represents a pair of component vectors, A and B, that would combine to form resultant vector R?

3. A person is standing on a bathroom scale in an elevator car. If the scale reads a value greater than the weight of the person at rest, the elevator car could be moving

• (1) downward at constant speed
• (2) upward at constant speed
• (3) downward at increasing speed
• (4) upward at increasing speed

Note that question 4 has only three choices.

4. The diagram below represents the path of an object after it was thrown.

What happens to the object’s acceleration as it travels from A to B? [Neglect friction.]

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

5. A 0.2-kilogram red ball is thrown horizontally at a speed of 4 meters per second from a height of 3 meters. A 0.4-kilogram green ball is thrown horizontally from the same height at a speed of 8 meters per second. Compared to the time it takes the red ball to reach the ground, the time it takes the green ball to reach the ground is

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

6. The acceleration due to gravity on the surface of planet X is 19.6 meters per second2. If an object on the surface of this planet weighs 980. newtons, the mass of the object is

• (1) 50.0 kg
• (2) 100. kg
• (3) 490. N
• (4) 908 N

7. A basketball player jumped straight up to grab a rebound. If she was in the air for 0.80 second, how high did she jump?

• (1) 0.50 m
• (2) 0.78 m
• (3) 1.2 m
• (4) 3.1 m

8. The force required to start an object sliding across a uniform horizontal surface is larger than the force required to keep the object sliding at a constant velocity. The magnitudes of the required forces are different in these situations because the force of kinetic friction

• (1) is greater than the force of static friction
• (2) is less than the force of static friction
• (3) increases as the speed of the object relative to the surface increases
• (4) decreases as the speed of the object relative to the surface increases

9. A 50.-kilogram student threw a 0.40-kilogram ball with a speed of 20. meters per second. What was the magnitude of the impulse that the student exerted on the ball?

• (1) 8.0 N•s
• (2) 78 N•s
• (3) 4.0 × 102 N•s
• (4) 1.0 × 103 N•s

10. A man is pushing a baby stroller. Compared to the magnitude of the force exerted on the stroller by the man, the magnitude of the force exerted on the man by the stroller is

• (1) zero
• (2) smaller, but greater than zero
• (3) larger
• (4) the same

11. The work done in moving a block across a rough surface and the heat energy gained by the block can both be measured in

• (1) watts
• (2) degrees
• (3) newtons
• (4) joules

Note that question 12 has only three choices.

12. Two weightlifters, one 1.5 meters tall and one 2.0 meters tall, raise identical 50.-kilogram masses above their heads. Compared to the work done by the weightlifter who is 1.5 meters tall, the work done by the weightlifter who is 2.0 meters tall is

• (1) less
• (2) greater
• (3) the same

13. A 45.0-kilogram boy is riding a 15.0-kilogram bicycle with a speed of 8.00 meters per second. What is the combined kinetic energy of the boy and the bicycle?

• (1) 240. J
• (2) 480. J
• (3) 1440 J
• (4) 1920 J

14. A 5-newton force causes a spring to stretch 0.2 meter. What is the potential energy stored in the stretched spring?

• (1) 1 J
• (2) 0.5 J
• (3) 0.2 J
• (4) 0.1 J

15. A 40.-kilogram student runs up a staircase to a floor that is 5.0 meters higher than her starting point in 7.0 seconds. The student’s power output is

• (1) 29 W
• (2) 280 W
• (3) 1.4 × 103 W
• (4) 1.4 × 104 W

16. Which type of field is present near a moving electric charge?

• (1) an electric field, only
• (2) a magnetic field, only
• (3) both an electric field and a magnetic field
• (4) neither an electric field nor a magnetic field

17. A negatively charged plastic comb is brought close to, but does not touch, a small piece of paper. If the comb and the paper are attracted to each other, the charge on the paper

• (1) may be negative or neutral
• (2) may be positive or neutral
• (3) must be negative
• (4) must be positive

18. If a 1.5-volt cell is to be completely recharged, each electron must be supplied with a minimum energy of

• (1) 1.5 eV
• (2) 1.5 J
• (3) 9.5 × 1018 eV
• (4) 9.5 × 1018 J

19. The current traveling from the cathode to the screen in a television picture tube is 5.0 × 10–5 ampere. How many electrons strike the screen in 5.0 seconds?

• (1) 3.1 × 1024
• (2) 6.3 × 1018
• (3) 1.6 × 1015
• (4) 1.0 × 105

20. A moving electron is deflected by two oppositely charged parallel plates, as shown in the diagram below.

The electric field between the plates is directed from

• (1) A to B
• (3) C to D
• (2) B to A
• (4) D to C

21. The diagram below shows two identical metal spheres, A and B, separated by distance d. Each sphere has mass m and possesses charge q

Which diagram best represents the electrostatic force Fe and the gravitational force Fg acting on sphere B due to sphere A?

22. The table below lists various characteristics of two metallic wires, A and B.

If wire A has resistance R, then wire B has resistance

• (1) R
• (2) 2R
• (3) R/2
• (4) 4R

23. The diagram below represents an electric circuit consisting of a 12-volt battery, a 3.0-ohm resistor, R1, and a variable resistor, R2.

At what value must the variable resistor be set to produce a current of 1.0 ampere through R1?

• (1) 6.0 Ω
• (2) 9.0 Ω
• (3) 3.0 Ω
• (4) 12 Ω

24. The energy of a photon is inversely proportional to its

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

25. The energy equivalent of the rest mass of an electron is approximately

• (1) 5.1 × 105 J
• (2) 8.2 × 10–14 J
• (3) 2.7 × 10–22 J
• (4) 8.5 × 10–28 J

26. A single vibratory disturbance moving through a medium is called

• (1) a node
• (2) an antinode
• (3) a standing wave
• (4) a pulse

27. An electric bell connected to a battery is sealed inside a large jar. What happens as the air is removed from the jar?

• (1) The electric circuit stops working because electromagnetic radiation can not travel through a vacuum.
• (2) The bell’s pitch decreases because the frequency of the sound waves is lower in a vacuum than in air.
• (3) The bell’s loudness increases because of decreased air resistance.
• (4) The bell’s loudness decreases because sound waves can not travel through a vacuum.

28. As a sound wave passes from water, where the speed is 1.49 × 103 meters per second, into air, the wave’s speed

• (1) decreases and its frequency remains the same
• (2) increases and its frequency remains the same
• (3) remains the same and its frequency decreases
• (4) remains the same and its frequency increases

29. Which phenomenon occurs when an object absorbs wave energy that matches the object’s natural frequency?

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

30. A ray of monochromatic light (f = 5.09 × 1014 hertz) in air is incident at an angle of 30.° on a boundary with corn oil. What is the angle of refraction, to the nearest degree, for this light ray in the corn oil?

• (1) 6°
• (2) 20.°
• (3) 30.°
• (4) 47°