# Physical Setting 24 June 2009

Physical Setting 24 June 2009 Questions Answer Keys

The University of the State of New York
Regents High School Examination
Physical Setting
Physics
Wednesday, June 24, 2009 — 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. On a highway, a car is driven 80. kilometers during the first 1.00 hour of travel, 50. kilometers during the next 0.50 hour, and 40. kilometers in the final 0.50 hour. What is the car’s average speed for the entire trip?

• (1) 45 km/h
• (2) 60. km/h
• (3) 85 km/h
• (4) 170 km/h

2. The vector diagram below represents the horizontal component, FH, and the vertical component, FV, of a 24-newton force acting at 35° above the horizontal.

What are the magnitudes of the horizontal and vertical components?

• (1) FH = 3.5 N and FV = 4.9 N
• (2) FH = 4.9 N and FV = 3.5 N
• (3) FH = 14 N and FV = 20. N
• (4) FH = 20. N and FV = 14 N

3. Which quantity is a vector?

• (1) impulse
• (2) power
• (3) speed
• (4) time

4. A high-speed train in Japan travels a distance of 300. kilometers in 3.60 × 103 seconds. What is the average speed of this train?

• (1) 1.20 × 10–2 m/s
• (2) 8.33 × 10–2 m/s
• (3) 12.0 m/s
• (4) 83.3 m/s

5. A 25-newton weight falls freely from rest from the roof of a building. What is the total distance the weight falls in the first 1.0 second?

• (1) 19.6 m
• (2) 9.8 m
• (3) 4.9 m
• (4) 2.5 m

6. A golf ball is given an initial speed of 20. meters per second and returns to level ground. Which launch angle above level ground results in the ball traveling the greatest horizontal distance? [Neglect friction.]

• (1) 60.°
• (2) 45°
• (3) 30.°
• (4) 15°

Base your answers to questions 7 and 8 on the information below.

A go-cart travels around a flat, horizontal, circular track with a radius of 25 meters. The mass of the go-cart with the rider is 200. kilograms. The magnitude of the maximum centripetal force exerted by the track on the go-cart is 1200. newtons.

7. What is the maximum speed the 200.-kilogram go-cart can travel without sliding off the track?

• (1) 8.0 m/s
• (2) 12 m/s
• (3) 150 m/s
• (4) 170 m/s

8. Which change would increase the maximum speed at which the go-cart could travel without sliding off this track?

• (1) Decrease the coefficient of friction between the go-cart and the track.
• (2) Decrease the radius of the track.
• (3) Increase the radius of the track.
• (4) Increase the mass of the go-cart.

9. A 0.50-kilogram cart is rolling at a speed of 0.40 meter per second. If the speed of the cart is doubled, the inertia of the cart is

• (1) halved
• (2) doubled
• (3) quadrupled
• (4) unchanged

10. Two forces, F1 and F2, are applied to a block on a frictionless, horizontal surface as shown below.

If the magnitude of the block’s acceleration is 2.0 meters per second2, what is the mass of the block?

• (1) 1 kg
• (2) 5 kg
• (3) 6 kg
• (4) 7 kg

11. Which body is in equilibrium?

• (1) a satellite orbiting Earth in a circular orbit
• (2) a ball falling freely toward the surface of Earth
• (3) a car moving with a constant speed along a straight, level road
• (4) a projectile at the highest point in its trajectory

12. What is the weight of a 2.00-kilogram object on the surface of Earth?

• (1) 4.91 N
• (2) 2.00 N
• (3) 9.81 N
• (4) 19.6 N

13. A 70.-kilogram cyclist develops 210 watts of power while pedaling at a constant velocity of 7.0 meters per second east. What average force is exerted eastward on the bicycle to maintain this constant speed?

• (1) 490 N
• (2) 30. N
• (3) 3.0 N
• (4) 0 N

14. The gravitational potential energy, with respect to Earth, that is possessed by an object is dependent on the object’s

• (1) acceleration
• (2) momentum
• (3) position
• (4) speed

15. As a ball falls freely toward the ground, its total mechanical energy

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

16. A spring with a spring constant of 4.0 newtons per meter is compressed by a force of 1.2 newtons. What is the total elastic potential energy stored in this compressed spring?

• (1) 0.18 J
• (2) 0.36 J
• (3) 0.60 J
• (4) 4.8 J

17. A distance of 1.0 meter separates the centers of two small charged spheres. The spheres exert gravitational force Fg and electrostatic force Fe on each other. If the distance between the spheres’ centers is increased to 3.0 meters, the gravitational force and electrostatic force, respectively, may be represented as

18. The electrical resistance of a metallic conductor is inversely proportional to its

• (1) temperature
• (2) length
• (3) cross-sectional area
• (4) resistivity

19. In a simple electric circuit, a 24-ohm resistor is connected across a 6.0-volt battery. What is the current in the circuit?

• (1) 1.0 A
• (2) 0.25 A
• (3) 140 A
• (4) 4.0 A

20. An operating 100.-watt lamp is connected to a 120-volt outlet. What is the total electrical energy used by the lamp in 60. seconds?

• (1) 0.60 J
• (2) 1.7 J
• (3) 6.0 × 103 J
• (4) 7.2 × 103 J

21. A beam of electrons is directed into the electric field between two oppositely charged parallel plates, as shown in the diagram below.

The electrostatic force exerted on the electrons by the electric field is directed

• (1) into the page
• (2) out of the page
• (3) toward the bottom of the page
• (4) toward the top of the page

22. When two ring magnets are placed on a pencil, magnet A remains suspended above magnet B, as shown below.

Which statement describes the gravitational force and the magnetic force acting on magnet A due to magnet B?

• (1) The gravitational force is attractive and the magnetic force is repulsive.
• (2) The gravitational force is repulsive and the magnetic force is attractive.
• (3) Both the gravitational force and the magnetic force are attractive.
• (4) Both the gravitational force and the magnetic force are repulsive.

23. Which color of light has a wavelength of 5.0 × 10–7 meter in air?

• (1) blue
• (2) green
• (3) orange
• (4) violet

24. Which type of wave requires a material medium through which to travel?

• (1) sound
• (2) radio
• (3) television
• (4) x ray

25. A periodic wave is produced by a vibrating tuning fork. The amplitude of the wave would be greater if the tuning fork were

• (1) struck more softly
• (2) struck harder
• (3) replaced by a lower frequency tuning fork
• (4) replaced by a higher frequency tuning fork

26. The sound wave produced by a trumpet has a frequency of 440 hertz. What is the distance between successive compressions in this sound wave as it travels through air at STP?

• (1) 1.5 × 10–6 m
• (2) 0.75 m
• (3) 1.3 m
• (4) 6.8 × 105 m

27. The diagram below represents a light ray striking the boundary between air and glass.

What would be the angle between this light ray and its reflected ray?

• (1) 30.°
• (2) 60.°
• (3) 120.°
• (4) 150.°

28. In which way does blue light change as it travels from diamond into crown glass?

• (1) Its frequency decreases.
• (2) Its frequency increases.
• (3) Its speed decreases.
• (4) Its speed increases.

29. The diagram below shows two pulses approaching each other in a uniform medium.

Which diagram best represents the superposition of the two pulses?

30. Sound waves strike a glass and cause it to shatter. This phenomenon illustrates

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

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