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 × 10 ^{1} meters per second^{2}. How long will it take the rocket to reach an altitude of 9.0 × 10^{3} meters?**

**(1) 3.0 × 10**^{1}s- (2) 4.3 × 10
^{1}s - (3) 4.5 × 10
^{2}s - (4) 9.0 × 10
^{2}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 × 10
^{4}N **(2) 1.9 × 10**^{3}N- (3) 2.2 × 10
^{2}N - (4) 3.0 × 10
^{1}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 × 10
^{2}N **(3) 9 × 10**^{2}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 × 10 ^{2} 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 × 10
^{2}J - (2) 1.8 × 10
^{3}J - (3) 3.0 × 10
^{3}J **(4) 9.0 × 10**^{3}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 × 10 ^{3}-kilogram car lost a total of 3.0 × 10^{5} 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} meter^{2}?**

- (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 R _{1} and the potential difference across resistor R_{2}?**

**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 × 10
^{5}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 × 10 ^{14} hertz) traveling through a block of sodium chloride?**

- (1) 1.54 × 10
^{8}m/s **(2) 1.95 × 10**^{8}m/s- (3) 3.00 × 10
^{8}m/s - (4) 4.62 × 10
^{8}m/s

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