Physical Setting 28 January 2004 Questions Answer Keys

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

Regents High School Examination

Physical Setting

Physics

Wednesday, January 28, 2004 — 9:15 a.m. to 12:15 p.m., only

**Directions (1–30): **For each statement or question, choose the word or expression that, of those given, best completes the statement or answers the question and fill in the circle for that choice in the appropriate row of the separate answer sheet.

**1. A girl leaves a history classroom and walks 10. meters north to a drinking fountain. Then she turns and walks 30. meters south to an art classroom. What is the girl’s total displacement from the history classroom to the art classroom?**

**(1) 20. m south**- (2) 20. m north
- (3) 40. m south
- (4) 40. m north

**2. One car travels 40. meters due east in 5.0 seconds, and a second car travels 64 meters due west in 8.0 seconds. During their periods of travel, the cars definitely had the same**

- (1) average velocity
- (2) total displacement
- (3) change in momentum
**(4) average speed**

**3. A skater increases her speed uniformly from 2.0 meters per second to 7.0 meters per second over a distance of 12 meters. The magnitude of her acceleration as she travels this 12 meters is**

**(1) 1.9 m/s**^{2}- (2) 2.2 m/s
^{2} - (3) 2.4 m/s
^{2} - (4) 3.8 m/s
^{2}

**4. A ball thrown vertically upward reaches a maximum height of 30. meters above the surface of Earth. At its maximum height, the speed of the ball is**

**(1) 0.0 m/s**- (2) 3.1 m/s
- (3) 9.8 m/s
- (4) 24 m/s

**5. Which object has the most inertia?**

- (1) a 0.001-kilogram bumblebee traveling at 2 meters per second
- (2) a 0.1-kilogram baseball traveling at 20 meters per second
- (3) a 5-kilogram bowling ball traveling at 3 meters per second
**(4) a 10.-kilogram sled at rest**

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

A child kicks a ball with an initial velocity of 8.5 meters per second at an angle of 35º with the horizontal, as shown. The ball has an initial vertical velocity of 4.9 meters per second and a total time of flight of 1.0 second. [Neglect air resistance.]

**6. The horizontal component of the ball’s initial velocity is approximately**

- (1) 3.6 m/s
- (2) 4.9 m/s
**(3) 7.0 m/s**- (4) 13 m/s

**7. The maximum height reached by the ball is approximately**

**(1) 1.2 m**- (2) 2.5 m
- (3) 4.9 m
- (4) 8.5 m

**8. A ball of mass M at the end of a string is swung in a horizontal circular path of radius R at constant speed V. Which combination of changes would require the greatest increase in the centripetal force acting on the ball?**

- (1) doubling V and doubling R
**(2) doubling V and halving R**- (3) halving V and doubling R
- (4) halving V and halving R

**9. The diagram below shows two small metal spheres, A and B. Each sphere possesses a net charge of 4.0 × 10– ^{6} coulomb. The spheres are separated by a distance of 1.0 meter.**

Which combination of charged spheres and separation distance produces an electrostatic force of the same magnitude as the electrostatic force between spheres A and B?

**10. A box is pushed toward the right across a classroom floor. The force of friction on the box is directed toward the**

**(1) left**- (2) right
- (3) ceiling
- (4) floor

**11. A 40.-kilogram mass is moving across a horizontal surface at 5.0 meters per second. What is the magnitude of the net force required to bring the mass to a stop in 8.0 seconds?**

- (1) 1.0 N
- (2) 5.0 N
**(3) 25 N**- (4) 40. N

**12. What is the speed of a 1.0 × 10 ^{3}-kilogram car that has a momentum of 2.0 × 10^{4} kilogram•meters per second east?**

- (1) 5.0 × 10–
^{2}m/s **(2) 2.0 × 10**^{1}m/s- (3) 1.0 × 10
^{4}m/s - (4) 2.0 × 10
^{7}m/s

**13. A positive test charge is placed between an electron, e, and a proton, p, as shown in the diagram below.**

When the test charge is released, it will move toward

- (1) A
- (2) B
- (3) C
**(4) D**

**14. If the speed of a car is doubled, the kinetic energy of the car is**

**(1) quadrupled**- (2) quartered
- (3) doubled
- (4) halved

**15. In which circuit would ammeter A show the greatest current?**

**16. The diagram below shows a 0.1-kilogram apple attached to a branch of a tree 2 meters above a spring on the ground below.**

The apple falls and hits the spring, compressing it 0.1 meter from its rest position. If all of the gravitational potential energy of the apple on the tree is transferred to the spring when it is compressed, what is the spring constant of this spring?

- (1) 10 N/m
- (2) 40 N/m
- (3) 100 N/m
**(4) 400 N/m**

**17. A 1-kilogram rock is dropped from a cliff 90 meters high. After falling 20 meters, the kinetic energy of the rock is approximately**

- (1) 20 J
**(2) 200 J**- (3) 700 J
- (4) 900 J

**18. A student does 60. joules of work pushing a 3.0-kilogram box up the full length of a ramp that is 5.0 meters long. What is the magnitude of the force applied to the box to do this work?**

- (1) 20. N
- (2) 15 N
**(3) 12 N**- (4) 4.0 N

**19. A boat weighing 9.0 × 10 ^{2} newtons requires a horizontal force of 6.0 × 10^{2} newtons to move it across the water at 1.5 × 10^{1} meters per second. The boat’s engine must provide energy at the rate of**

- (1) 2.5 × 10–
^{2}J - (2) 4.0 × 10
^{1}W - (3) 7.5 × 10
^{3}J **(4) 9.0 × 10**^{3}W

**20. In order to produce a magnetic field, an electric charge must be**

- (1) stationary
**(2) moving**- (3) positive
- (4) negative

**21. In a simple electric circuit, a 110-volt electric heater draws 2.0 amperes of current. The resistance of the heater is**

- (1) 0.018 Ω
- (2) 28 Ω
**(3) 55 Ω**- (4) 220 Ω

**22. A student strikes the top rope of a volleyball net, sending a single vibratory disturbance along the length of the net, as shown in the diagram below.**

This disturbance is best described as

**(1) a pulse**- (2) a periodic wave
- (3) a longitudinal wave
- (4) an electromagnetic wave

**23. A 10.-meter length of wire with a cross-sectional area of 3.0 × 10– ^{6} square meter has a resistance of 9.4 × 10–^{2} ohm at 20° Celsius. The wire is most likely made of**

- (1) silver
- (2) copper
**(3) aluminum**- (4) tungsten

**24. A potential drop of 50. volts is measured across a 250-ohm resistor. What is the power developed in the resistor?**

- (1) 0.20 W
- (2) 5.0 W
**(3) 10. W**- (4) 50. W

**25. If the frequency of a periodic wave is doubled, the period of the wave will be**

**(1) halved**- (2) doubled
- (3) quartered
- (4) quadrupled

**26. How much time does it take light from a flash camera to reach a subject 6.0 meters across a room?**

- (1) 5.0 × 10–
^{9}s - (2) 2.0 × 10–
^{8}s - (3) 5.0 × 10–
^{8}s **(4) 2.0 × 10–**^{7}s

**27. What happens to the frequency and the speed of an electromagnetic wave as it passes from air into glass?**

- (1) The frequency decreases and the speed increases.
- (2) The frequency increases and the speed decreases.
**(3) The frequency remains the same and the speed increases.**- (4) The frequency remains the same and the speed decreases.

**28. Which ray diagram best represents the phenomenon of refraction?**

**29. Which wave phenomenon makes it possible for a player to hear the sound from a referee’s whistle in an open field even when standing behind the referee?**

**(1) diffraction**- (2) Doppler effect
- (3) reflection
- (4) refraction

**30. Two pulses, A and B, travel toward each other along the same rope, as shown below.**

When the centers of the two pulses meet at point X, the amplitude at the center of the resultant pulse will be

- (1) +1 unit
- (2) +2 units
**(3) 0**- (4) –1 unit

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