# Physical Setting 22 June 2006

Physical Setting 22 June 2006 Questions Answer Keys

The University of the State of New York
Regents High School Examination
Physical Setting
Physics
Thursday, June 22, 2006 — 9:15 a.m. to 12:15 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. A rock falls from rest off a high cliff. How far has the rock fallen when its speed is 39.2 meters per second? [Neglect friction.]

• (1) 19.6 m
• (2) 44.1 m
• (3) 78.3 m
• (4) 123 m

2. A rocket initially at rest on the ground lifts off vertically with a constant acceleration of 2.0 × 101 meters per second2. How long will it take the rocket to reach an altitude of 9.0 × 103 meters?

• (1) 3.0 × 101 s
• (2) 4.3 × 101 s
• (3) 4.5 × 102 s
• (4) 9.0 × 102 s

3. The diagram below represents a force vector, A, and a resultant vector, R.

## A ↑          ⁄ R

Which force vector B below could be added to force vector A to produce resultant vector R? 4. A golf ball is propelled with an initial velocity of 60. meters per second at 37° above the horizontal. The horizontal component of the golf ball’s initial velocity is

• (1) 30. m/s
• (2) 36 m/s
• (3) 40. m/s
• (4) 48 m/s

5. Which object has the greatest inertia?

• (1) a 1.0-kilogram object moving at 15 meters per second
• (2) a 5.0-kilogram object at rest
• (3) a 10.-kilogram object moving at 2.0 meters per second
• (4) a 15-kilogram object at rest

6. A 3-newton force and a 4-newton force are acting concurrently on a point. Which force could not produce equilibrium with these two forces?

(1) 1 N (3) 9 N
(2) 7 N (4) 4 N

Base your answers to questions 7 and 8 on the information and diagram below
The diagram shows the top view of a 65-kilogram student at point A on an amusement park ride. The ride spins the student in a horizontal circle of radius 2.5 meters, at a constant speed of 8.6 meters per second. The floor is lowered and the student remains against the wall without falling to the floor. 7. Which vector best represents the direction of the centripetal acceleration of the student at point A? 8. The magnitude of the centripetal force acting on the student at point A is approximately

• (1) 1.2 × 104 N
• (2) 1.9 × 103 N
• (3) 2.2 × 102 N
• (4) 3.0 × 101 N

9. A 60-kilogram student jumps down from a laboratory counter. At the instant he lands on the floor his speed is 3 meters per second. If the student stops in 0.2 second, what is the average force of the floor on the student?

• (1) 1 × 10–2 N
• (2) 1 × 102 N
• (3) 9 × 102 N
• (4) 4 N

10. A positively charged glass rod attracts object X. The net charge of object X.

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

11. Which diagram best represents the gravitational field lines surrounding Earth? 12. A 2.0-kilogram block sliding down a ramp from a height of 3.0 meters above the ground reaches the ground with a kinetic energy of 50. joules. The total work done by friction on the block as it slides down the ramp is approximately

• (1) 6 J
• (2) 9 J
• (3) 18 J
• (4) 44 J

13. A person weighing 6.0 × 102 newtons rides an elevator upward at an average speed of 3.0 meters per second for 5.0 seconds. How much does this person’s gravitational potential energy increase as a result of this ride?

• (1) 3.6 × 102 J
• (2) 1.8 × 103 J
• (3) 3.0 × 103 J
• (4) 9.0 × 103 J

14. The potential energy stored in a compressed spring is to the change in the spring’s length as the kinetic energy of a moving body is to the body’s

• (1) speed
• (2) mass
• (3) radius
• (4) acceleration

Note that question 15 has only three choices.

15. The diagram below shows an ideal simple pendulum. As the pendulum swings from position A to position B, what happens to its total mechanical energy? [Neglect friction.]

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

16. During an emergency stop, a 1.5 × 103-kilogram car lost a total of 3.0 × 105 joules of kinetic energy. What was the speed of the car at the moment the brakes were applied?

• (1) 10. m/s
• (2) 14 m/s
• (3) 20. m/s
• (4) 25 m/s

17. Radio waves are propagated through the interaction of

• (1) nuclear and electric fields
• (2) electric and magnetic fields
• (3) gravitational and magnetic fields
• (4) gravitational and electric fields

18. What is the resistance at 20.°C of a 2.0-meter length of tungsten wire with a cross-sectional area of 7.9 × 10–7 meter2?

• (1) 5.7 × 10–1 Ω
• (2) 1.4 × 10–1 Ω
• (3) 7.1 × 10–2 Ω
• (4) 4.0 × 10–2 Ω

19. A 6.0-ohm resistor that obeys Ohm’s Law is connected to a source of variable potential difference. When the applied voltage is decreased from 12 V to 6.0 V, the current passing through the resistor

• (1) remains the same
• (2) is doubled
• (3) is halved
• (4) is quadrupled

20. In which circuit represented below are meters properly connected to measure the current through resistor R1 and the potential difference across resistor R2? 21. Two identical resistors connected in series have an equivalent resistance of 4 ohms. The same two resistors, when connected in parallel, have an equivalent resistance of

• (1) 1 Ω
• (2) 2 Ω
• (3) 8 Ω
• (4) 4 Ω

22. A 50-watt lightbulb and a 100-watt lighbulb are each operated at 110 volts. Compared to the resistance of the 50-watt bulb, the resistance of the 100-watt bulb is

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

23. A device operating at a potential difference of 1.5 volts draws a current of 0.20 ampere. How much energy is used by the device in 60. seconds?

• (1) 4.5 J
• (2) 8.0 J
• (3) 12 J
• (4) 18 J

24. As the number of resistors in a parallel circuit is increased, what happens to the equivalent resistance of the circuit and total current in the circuit?

• (1) Both equivalent resistance and total current decrease.
• (2) Both equivalent resistance and total current increase.
• (3) Equivalent resistance decreases and total current increases.
• (4) Equivalent resistance increases and total current decreases.

25. The energy of a sound wave is most closely related to its

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

26. A person observes a fireworks display from a safe distance of 0.750 kilometer. Assuming that sound travels at 340. meters per second in air, what is the time between the person seeing and hearing a fireworks explosion?

• (1) 0.453 s
• (2) 2.21 s
• (3) 410. s
• (4) 2.55 × 105 s

27. Electromagnetic radiation having a wavelength of 1.3 × 10–7 meter would be classified as

• (1) infrared
• (2) orange
• (3) blue
• (4) ultraviolet

28. The diagram below represents straight wave fronts passing from deep water into shallow water, with a change in speed and direction. Which phenomenon is illustrated in the diagram?

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

29. Which diagram best represents the path taken by a ray of monochromatic light as it passes from air through the materials shown? 30. What is the speed of a ray of light (f = 5.09 × 1014 hertz) traveling through a block of sodium chloride?

• (1) 1.54 × 108 m/s
• (2) 1.95 × 108 m/s
• (3) 3.00 × 108 m/s
• (4) 4.62 × 108 m/s

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