Physical Setting 29 January 2003 Questions Answer Keys

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

Regents High School Examination

Physical Setting

Physics

Wednesday, January 29, 2003 — 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. The diagram below shows a worker using a rope to pull a cart.**

The worker’s pull on the handle of the cart can best be described as a force having

- (1) magnitude, only
- (2) direction, only
**(3) both magnitude and direction**- (4) neither magnitude nor direction

**2. A car travels 90. meters due north in 15 seconds. Then the car turns around and travels 40. meters due south in 5.0 seconds. What is the magnitude of the average velocity of the car during this 20.-second interval?**

**(1) 2.5 m/s**- (2) 5.0 m/s
- (3) 6.5 m/s
- (4) 7.0 m/s

**3. How far will a brick starting from rest fall freely in 3.0 seconds?**

- (1) 15 m
- (2) 29 m
**(3) 44 m**- (4) 88 m

**4. If the sum of all the forces acting on a moving object is zero, the object will**

- (1) slow down and stop
- (2) change the direction of its motion
- (3) accelerate uniformly
**(4) continue moving with constant velocity**

**5. A net force of 10. newtons accelerates an object at 5.0 meters per second ^{2}. What net force would be required to accelerate the same object at 1.0 meter per second^{2}?**

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

**6. The graph below represents the relationship between gravitational force and mass for objects near the surface of Earth.**

The slope of the graph represents the

**(1) acceleration due to gravity**- (2) universal gravitational constant
- (3) momentum of objects
- (4) weight of objects

**7. A 1,200-kilogram car traveling at 10. meters per second hits a tree and is brought to rest in 0.10 second. What is the magnitude of the average force acting on the car to bring it to rest?**

- (1) 1.2 × 10
^{2}N - (2) 1.2 × 10
^{3}N - (3) 1.2 × 10
^{4}N **(4) 1.2 × 10**^{5}N

**8. A spring scale reads 20. newtons as it pulls a 5.0-kilogram mass across a table. What is the magnitude of the force exerted by the mass on the spring scale?**

- (1) 49 N
**(2) 20. N**- (3) 5.0 N
- (4) 4.0 N

Base your answers to questions 9 and 10 on the information below.

A 2.0 × 10^{3}-kilogram car travels at a constant speed of 12 meters per second around a circular curve of radius 30. meters.

**9. What is the magnitude of the centripetal acceleration of the car as it goes around the curve?**

- (1) 0.40 m/s
^{2} **(2) 4.8 m/s**^{2}- (3) 800 m/s
^{2} - (4) 9,600 m/s
^{2}

**10. As the car goes around the curve, the centripetal force is directed**

**(1) toward the center of the circular curve**- (2) away from the center of the circular curve
- (3) tangent to the curve in the direction of motion
- (4) tangent to the curve opposite the direction of motion

**Note that question 11 has only three choices.**

**11. The diagram below shows a block sliding down a plane inclined at angle with the horizontal.**

As angle is increased, the coefficient of kinetic friction between the bottom surface of the block and the surface of the incline will

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

**12. The amount of work done against friction to slide a box in a straight line across a uniform, horizontal floor depends most on the**

- (1) time taken to move the box
**(2) distance the box is moved**- (3) speed of the box
- (4) direction of the box’s motion

**13. A 1.2-kilogram block and a 1.8-kilogram block are initially at rest on a frictionless, horizontal surface. When a compressed spring between the blocks is released, the 1.8-kilogram block moves to the right at 2.0 meters per second, as shown.**

What is the speed of the 1.2-kilogram block after the spring is released?

- (1) 1.4 m/s
- (2) 2.0 m/s
**(3) 3.0 m/s**- (4) 3.6 m/s

**14. An object weighs 100. newtons on Earth’s surface. When it is moved to a point one Earth radius above Earth’s surface, it will weigh**

**(1) 25.0 N**- (2) 50.0 N
- (3) 100. N
- (4) 400. N

**15. An object weighing 15 newtons is lifted from the ground to a height of 0.22 meter. The increase in the object’s gravitational potential energy is approximately**

- (1) 310 J
- (2) 32 J
**(3) 3.3 J**- (4) 0.34 J

**Note that question 16 has only three choices.**

**16. As an object falls freely, the kinetic energy of the object**

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

**17. Moving 2.5 × 10– ^{6} coulomb of charge from point A to point B in an electric field requires 6.3 × 10–^{4} joule of work. The potential difference between points A and B is approximately**

- (1) 1.6 × 10–
^{9}V - (2) 4.0 × 10–
^{3}V **(3) 2.5 × 10**^{2}V- (4) 1.0 × 10
^{14}V

**18. A 3.0-kilogram block is initially at rest on a frictionless, horizontal surface. The block is moved 8.0 meters in 2.0 seconds by the application of a 12-newton horizontal force, as shown in the diagram below.**

What is the average power developed while moving the block?

- (1) 24 W
- (2) 32 W
**(3) 48 W**- (4) 96 W

**19. The diagram below shows three neutral metal spheres, x, y, and z, in contact and on insulating stands.**

Which diagram best represents the charge distribution on the spheres when a positively charged rod is brought near sphere x, but does not touch it?

**20. Which graph best represents the electrostatic force between an alpha particle with a charge of +2 elementary charges and a positively charged nucleus as a function of their distance of separation?**

**21. When a neutral metal sphere is charged by contact with a positively charged glass rod, the sphere**

**(1) loses electrons**- (2) gains electrons
- (3) loses protons
- (4) gains protons

**22. If 10. coulombs of charge are transferred through an electric circuit in 5.0 seconds, then the current in the circuit is**

- (1) 0.50 A
**(2) 2.0 A**- (3) 15 A
- (4) 50. A

**23. The diagram below represents a source of potential difference connected to two large, parallel metal plates separated by a distance of 4.0 × 10– ^{3 }meter.**

Which statement best describes the electric field strength between the plates?

- (1) It is zero at point B.
- (2) It is a maximum at point B.
- (3) It is a maximum at point C.
**(4) It is the same at points A, B, and C**.

**24. A periodic wave transfers**

**(1) energy, only**- (2) mass, only
- (3) both energy and mass
- (4) neither energy nor mass

**Note that question 25 has only three choices.**

**25. As the potential difference across a given resistor is increased, the power expended in moving charge through the resistor**

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

**26. An electric iron operating at 120 volts draws 10. amperes of current. How much heat energy is delivered by the iron in 30. seconds?**

- (1) 3.0 × 10
^{2}J - (2) 1.2 × 10
^{3}J - (3) 3.6 × 10
^{3}J **(4) 3.6 × 10**^{4}J

**27. A motor is used to produce 4.0 waves each second in a string. What is the frequency of the waves?**

- (1) 0.25 Hz
- (2) 15 Hz
- (3) 25 Hz
**(4) 4.0 Hz**

**28. The diagram below shows a periodic wave.**

Which points are in phase with each other?

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

**29. A surfacing whale in an aquarium produces water wave crests having an amplitude of 1.2 meters every 0.40 second. If the water wave travels at 4.5 meters per second, the wavelength of the wave is**

**(1) 1.8 m**- (2) 2.4 m
- (3) 3.0 m
- (4) 11 m

**30. In a certain material, a beam of monochromatic light (f = 5.09 × 10 ^{14} hertz) has a speed of 2.25 × 10^{8} meters per second. The material could be**

- (1) crown glass
- (2) flint glass
- (3) glycerol
**(4) water**

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