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 × 10
^{2}N•s - (4) 1.0 × 10
^{3}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 × 10
^{3}W - (4) 1.4 × 10
^{4}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 × 10
^{18}eV - (4) 9.5 × 10
^{18}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 × 10
^{24} - (2) 6.3 × 10
^{18} **(3) 1.6 × 10**^{15}- (4) 1.0 × 10
^{5}

**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 F_{g} 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, R _{1}, and a variable resistor, R_{2}.**

At what value must the variable resistor be set to produce a current of 1.0 ampere through R_{1}?

- (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 × 10
^{5}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 × 10 ^{3} 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 × 10 ^{14} 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°

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