# Physical Setting 18 June 2002

Physical Setting 18 June 2002 Questions Answer Keys

The University of the State of New York
Regents High School Examination
Physical Setting
Physics
Tuesday, June 18, 2002 — 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. Which is a vector quantity?

• (1) distance
• (2) speed
• (3) power
• (4) force

2. The diagram below shows a granite block being slid at constant speed across a horizontal concrete floor by a force parallel to the floor.

Which pair of quantities could be used to determine the coefficient of friction for the granite on the concrete?

• (1) mass and speed of the block
• (2) mass and normal force on the block
• (3) frictional force and speed of the block
• (4) frictional force and normal force on the block

3. An object with an initial speed of 4.0 meters per second accelerates uniformly at 2.0 meters per second2 in the direction of its motion for a distance of 5.0 meters. What is the final speed of the object?

• (1) 6.0 m/s
• (2) 10. m/s
• (3) 14 m/s
• (4) 36 m/s

4. After a model rocket reached its maximum height, it then took 5.0 seconds to return to the launch site. What is the approximate maximum height reached by the rocket? [Neglect air resistance.]

• (1) 49 m
• (2) 98 m
• (3) 120 m
• (4) 250 m

5. The diagram below shows a student throwing a baseball horizontally at 25 meters per second from a cliff 45 meters above the level ground.

Approximately how far from the base of the cliff does the ball hit the ground? [Neglect air resistance.]

• (1) 45 m
• (2) 75 m
• (3) 140 m
• (4) 230 m

6. A projectile is fired from a gun near the surface of Earth. The initial velocity of the projectile has a vertical component of 98 meters per second and a horizontal component of 49 meters per second. How long will it take the projectile to reach the highest point in its path?

• (1) 5.0 s
• (2) 10. s
• (3) 20. s
• (4) 100. s

7. A 70.-kilogram astronaut has a weight of 560 newtons on the surface of planet Alpha. What is the acceleration due to gravity on planet Alpha?

• (1) 0.0 m/s2
• (2) 8.0 m/s2
• (3) 9.8 m/s2
• (4) 80. m/s2

Base your answers to questions 8 and 9 on the diagram and information below.

The diagram shows a student seated on a rotating circular platform, holding a 2.0-kilogram block with a spring scale. The block is 1.2 meters from the center of the platform. The block has a constant speed of 8.0 meters per second. [Frictional forces on the block are negligible.]

8. Which statement best describes the block’s movement as the platform rotates?

• (1) Its velocity is directed tangent to the circular path, with an inward acceleration.
• (2) Its velocity is directed tangent to the circular path, with an outward acceleration.
• (3) Its velocity is directed perpendicular to the circular path, with an inward acceleration.
• (4) Its velocity is directed perpendicular to the circular path, with an outward acceleration.

9. The reading on the spring scale is approximately

• (1) 20. N
• (2) 53 N
• (3) 110 N
• (4) 130 N

10. The diagram below shows a horizontal 8.0-newton force applied to a 4.0-kilogram block on a frictionless table.

What is the magnitude of the block’s acceleration?

• (1) 0.50 m/s2
• (2) 2.0 m/s2
• (3) 9.8 m/s2
• (4) 32 m/s2

11. A 0.10-kilogram model rocket’s engine is designed to deliver an impulse of 6.0 newtonseconds. If the rocket engine burns for 0.75 second, what average force does it produce?

• (1) 4.5 N
• (2) 8.0 N
• (3) 45 N
• (4) 80. N

Base your answers to questions 12 and 13 on the information and diagram below.

The diagram shows a compressed spring between two carts initially at rest on a horizontal frictionless surface. Cart A has a mass of 2 kilograms and cart B has a mass of 1 kilogram. A string holds the carts together.

12. What occurs when the string is cut and the carts move apart?

• (1) The magnitude of the acceleration of cart A is one-half the magnitude of the acceleration of cart B.
• (2) The length of time that the force acts on cart A is twice the length of time the force acts on cart B.
• (3) The magnitude of the force exerted on cart A is one-half the magnitude of the force exerted on cart B.
• (4) The magnitude of the impulse applied to cart A is twice the magnitude of the impulse applied to cart B.

13. After the string is cut and the two carts move apart, the magnitude of which quantity is the same for both carts?

• (1) momentum
• (2) velocity
• (3) inertia
• (4) kinetic energy

14. An object moving at a constant speed of 25 meters per second possesses 450 joules of kinetic energy. What is the object’s mass?

• (1) 0.72 kg
• (2) 1.4 kg
• (3) 18 kg
• (4) 36 kg

15. The diagram below shows a moving, 5.00-kilogram cart at the foot of a hill 10.0 meters high. For the cart to reach the top of the hill, what is the minimum kinetic energy of the cart in the position shown? [Neglect energy loss due to friction.]

16. A constant force of 1900 newtons is required to keep an automobile having a mass of 1.0 × 103 kilograms moving at a constant speed of 20. meters per second. The work done in moving the automobile a distance of 2.0 × 103 meters is

• (1) 2.0 × 104 J
• (2) 3.8 × 104 J
• (3) 2.0 × 106 J
• (4) 3.8 × 106 J

17. The energy required to move one elementary charge through a potential difference of 5.0 volts is

• (1) 8.0 J
• (2) 5.0 J
• (3) 8.0 × 10–19 J
• (4) 1.6 × 10–19 J

18. The diagram below shows two identical metal spheres, A and B, on insulated stands. Each sphere possesses a net charge of – 3 × 10–6 coulomb.

If the spheres are brought into contact with each other and then separated, the charge on sphere A will be

• (1) 0 C
• (2) +3 × 10–6 C
• (3) –3 × 10–6 C
• (4) –6 × 10–6 C

19. In a vacuum, light with a frequency of 5.0 × 1014 hertz has a wavelength of

• (1) 6.0 × 10–21 m
• (2) 6.0 × 10–7 m
• (3) 1.7 × 106 m
• 4) 1.5 × 1023 m

20. In the diagram below, 400. joules of work is done raising a 72-newton weight a vertical distance of 5.0 meters.

How much work is done to overcome friction as the weight is raised?

• (1) 40. J
• (2) 360 J
• (3) 400. J
• (4) 760 J

21. An incandescent light bulb is supplied with a constant potential difference of 120 volts. As the filament of the bulb heats up, its resistance

• (1) increases and the current through it decreases
• (2) increases and the current through it increases
• (3) decreases and the current through it decreases
• (4) decreases and the current through it increases

22. During a thunderstorm, a lightning strike transfers 12 coulombs of charge in 2.0 × 10–3 second. What is the average current produced in this strike?

• (1) 1.7 × 10–4 A
• (2) 2.4 × 10–2 A
• (3) 6.0 × 103 A
• (4) 9.6 × 103 A

Note that question 23 has only three choices.

23. A 30.-ohm resistor and a 60.-ohm resistor are connected in an electric circuit as shown below

Compared to the electric current through the 30.-ohm resistor, the electric current through the 60.-ohm resistor is

• (1) smaller
• (2) larger
• (3) the same

24. An operating electric heater draws a current of 10. amperes and has a resistance of 12 ohms. How much energy does the heater use in 60. seconds?

• (1) 120 J
• (2) 1200 J
• (3) 7200 J
• (4) 72,000 J

26. The diagram below represents a periodic wave

Which two points on the wave are in phase?

• (1) A and C
• (2) B and D
• (3) A and D
• (4) B and

27. A beam of monochromatic light travels through flint glass, crown glass, Lucite, and water. The speed of the light beam is slowest in

• (1) flint glass
• (2) crown glass
•  (3) Lucite
• (4) water

28. A standing wave pattern is produced when a guitar string is plucked. Which characteristic of the standing wave immediately begins to decrease?

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

29. A source of sound waves approaches a stationary observer through a uniform medium. Compared to the frequency and wavelength of the emitted sound, the observer would detect waves with a

• (1) higher frequency and shorter wavelength
• (2) higher frequency and longer wavelength
• (3) lower frequency and shorter wavelength
• (4) lower frequency and longer wavelength

30 What is the smallest electric charge that can be put on an object?

• (1) 9.11 × 10–31 C
• (2) 1.60 × 10–19 C
• (3) 9.00 × 109 C
• (4) 6.25 × 1018 C