Physical Setting 17 June 2003 Questions Answer Keys

**The University of the State of New York**

Regents High School Examination

Physical Setting

Physics

Tuesday, June 17, 2003 — 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. The diagram below shows a 50.-kilogram crate on a frictionless plane at angle to the horizontal. The crate is pushed at constant speed up the incline from point A to point B by force F.**

If angle were increased, what would be the effect on the magnitude of force F and the total work W done on the crate as it is moved from A to B?

- (1) W would remain the same and the magnitude of F would decrease.
- (2) W would remain the same and the magnitude of F would increase.
- (3) W would increase and the magnitude of F would decrease.
**(4) W would increase and the magnitude of F would increase.**

**2. A vector makes an angle, , with the horizontal. The horizontal and vertical components of the vector will be equal in magnitude if angle is**

- (1) 30°
**(2) 45°**- (3) 60°
- (4) 90°

**3. A car initially traveling at a speed of 16 meters per second accelerates uniformly to a speed of 20. meters per second over a distance of 36 meters. What is the magnitude of the car’s acceleration? 3 A car initially traveling at a speed of 16 meters per second accelerates uniformly to a speed of 20. meters per second over a distance of 36 meters. What is the magnitude of the car’s acceleration?**

- (1) 0.11 m/s
^{2} **(2) 2.0 m/s**^{2}- (3) 0.22 m/s
^{2} - (4) 9.0 m/s
^{2}

**4. A ball is thrown at an angle of 38° to the horizontal. What happens to the magnitude of the ball’s vertical acceleration during the total time interval that the ball is in the air?**

- (1) It decreases, then increases.
- (2) It decreases, then remains the same.
- (3) It increases, then decreases.
**(4) It remains the same**

**5. A man standing on a scale in an elevator notices that the scale reads 30 newtons greater than his normal weight. Which type of movement of the elevator could cause this greater-than-normal reading?**

**(1) accelerating upward**- (2) accelerating downward
- (3) moving upward at constant speed
- (4) moving downward at constant speed

Base your answers to questions 6 and 7 on the information below.

Projectile A is launched horizontally at a speed of 20. meters per second from the top of a cliff and strikes a level surface below, 3.0 seconds later. Projectile B is launched horizontally from the same location at a speed of 30. meters per second.

**6. The time it takes projectile B to reach the level surface is**

- (1) 4.5 s
- (2) 2.0 s
**(3) 3.0 s**- (4) 10. s

**7. Approximately how high is the cliff?**

- (1) 29 m
**(2) 44 m**- (3) 60. m
- (4) 104 m

**8. A 60-kilogram skydiver is falling at a constant speed near the surface of Earth. The magnitude of the force of air friction acting on the skydiver is approximately**

- (1) 0 N
- (2) 6 N
- (3) 60 N
**(4) 600 N**

**9. An astronaut weighs 8.00 × 10 ^{2} newtons on the surface of Earth. What is the weight of the astronaut 6.37 × 10^{6} meters above the surface of Earth?**

- (1) 0.00 N
**(2) 2.00 × 102 N**- (3) 1.60 × 103 N
- (4) 3.20 × 103 N

**10. A 10.-newton force is required to hold a stretched spring 0.20 meter from its rest position. What is the potential energy stored in the stretched spring?**

**(1) 1.0 J**- (2) 2.0 J
- (3) 5.0 J
- (4) 50. J

**11. When a 12-newton horizontal force is applied to a box on a horizontal tabletop, the box remains at rest. The force of static friction acting on the box is**

- (1) 0 N
- (2) between 0 N and 12 N
**(3) 12 N**- (4) greater than 12 N

**12. Ball A of mass 5.0 kilograms moving at 20. meters per second collides with ball B of unknown mass moving at 10. meters per second in the same direction. After the collision, ball A moves at 10. meters per second and ball B at 15 meters per second, both still in the same direction. What is the mass of ball B?**

- (1) 6.0 kg
- (2) 2.0 kg
**(3) 10. kg**- (4) 12 kg

**13. A 1.5-kilogram lab cart is accelerated uniformly from rest to a speed of 2.0 meters per second in 0.50 second. What is the magnitude of the force producing this acceleration?**

- (1) 0.70 N
- (2) 1.5 N
- (3) 3.0 N
**(4) 6.0 N**

**14. The diagram below represents the magnetic field near point P.**

If a compass is placed at point P in the same plane as the magnetic field, which arrow represents the direction the north end of the compass needle will point?

**15. Which person has the greatest inertia?**

**(1) a 110-kg wrestler resting on a mat**- (2) a 90-kg man walking at 2 m/s
- (3) a 70-kg long-distance runner traveling at 5 m/s
- (4) a 50-kg girl sprinting at 10 m/s

**16. A child is riding on a merry-go-round. As the speed of the merry-go-round is doubled, the magnitude of the centripetal force acting on the child**

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

**17. The magnitude of the electrostatic force between two point charges is F. If the distance between the charges is doubled, the electrostatic force between the charges will become**

**(1) F/4**- (2) 2F
- (3)F/2
- (4) 4F

**Note that question 18 has only three choices.**

**18. As a ball falls freely (without friction) toward the ground, its total mechanical energy**

- (1) decreases
- (2) increases
**(3) remains the**

**19. A 0.50-kilogram ball is thrown vertically upward with an initial kinetic energy of 25 joules. Approximately how high will the ball rise? [Neglect air resistance.]**

- (1) 2.6 m
**(2) 5.1 m**- (3) 13 m
- (4) 25 m

**20. What is the average power developed by a motor as it lifts a 400.-kilogram mass at constant speed through a vertical distance of 10.0 meters in 8.0 seconds?**

- (1) 320 W
- (2) 500 W
**(3) 4,900 W**- (4) 32,000 W

**21. If 4.8 × 10– ^{17} joule of work is required to move an electron between two points in an electric field, what is the electric potential difference between these points?**

- (1) 1.6 × 10–
^{19}V - (2) 4.8 × 10–
^{17}V **(3) 3.0 × 10**^{2}V- (4) 4.8 × 10
^{2}V

**Note that question 22 has only three choices.**

**22. The diagram below shows a wire moving to the right at speed v through a uniform magnetic field that is directed into the page.**

As the speed of the wire is increased, the induced potential difference will

- (1) decrease
**(2) increase**- (3) remain the same

**23. A change in the speed of a wave as it enters a new medium produces a change in**

- (1) frequency
- (2) period
**(3) wavelength**- (4) phase

**24. Two identical resistors connected in parallel have an equivalent resistance of 40. ohms. What is the resistance of each resistor?**

- (1) 20. Ω
- (2) 40. Ω
**(3) 80. Ω**- (4) 160 Ω

**25. A tuning fork oscillates with a frequency of 256 hertz after being struck by a rubber hammer. Which phrase best describes the sound waves produced by this oscillating tuning fork?**

- (1) electromagnetic waves that require no medium for transmission
- (2) electromagnetic waves that require a medium for transmission
- (3) mechanical waves that require no medium for transmission
**(4) mechanical waves that require a medium for transmission**

**26. In a vacuum, all electromagnetic waves have the same**

- (1) wavelength
- (2) frequency
**(3) speed**- (4) amplitude

**27. The speed of light (f = 5.09 × 10 ^{14} Hz) in a transparent material is 0.75 times its speed in air. The absolute index of refraction of the material is approximately**

- (1) 0.75
**(2) 1.3**- (3) 2.3
- (4) 4.0

**28. Waves pass through a 10.-centimeter opening in a barrier without being diffracted. This observation provides evidence that the wavelength of the waves is**

**(1) much shorter than 10. cm**- (2) equal to 10. cm
- (3) longer than 10. cm, but shorter than 20. cm
- (4) longer than 20. cm

**29. Standing waves in water are produced most often by periodic water waves**

- (1) being absorbed at the boundary with a new medium
- (2) refracting at a boundary with a new medium
- (3) diffracting around a barrier
**(4) reflecting from a barrier**

**Note that question 30 has only three choices.**

**30. A sound of constant frequency is produced by the siren on top of a firehouse. Compared to the frequency produced by the siren, the frequency observed by a firefighter approaching the firehouse is**

- (1) lower
**(2) higher**- (3) the same

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