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 second ^{2} 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/s
^{2} - (2) 8.0 m/s
^{2} - (3) 9.8 m/s
^{2} - (4) 80. m/s
^{2}

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/s
^{2} - (2) 2.0 m/s
^{2} - (3) 9.8 m/s
^{2} - (4) 32 m/s
^{2}

**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 × 10 ^{14} hertz has a wavelength of**

- (1) 6.0 × 10–
^{21}m - (2) 6.0 × 10–
^{7}m - (3) 1.7 × 10
^{6}m - 4) 1.5 × 10
^{23}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 × 10
^{3}A - (4) 9.6 × 10
^{3}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 × 10
^{9}C - (4) 6.25 × 10
^{18}C

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