Physical Setting 23 January 2001 Questions Answer Keys

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

Regents High School Examination

Physical Setting

Physics

Tuesday, January 23, 2001 — 9:15 a.m. to 12:15 p.m., only

**Directions (1–30):** For each statement or question, select the word or expression that, of those given, best completes the statement or answers the question. Record your answer on the separate answer paper in accordance with the directions on the front page of this booklet.

**1. The maximum time allowed for the completion of this examination is approximately**

- (1) 10
^{2}s - (2) 10
^{3}s **(3) 10**^{4}s- (4) 10
^{5}s

**2. The diagram below represents the relationship between velocity and time of travel for four cars, A, B, C, and D, in straight-line motion.**

Which car has the greatest acceleration during the time interval 10. seconds to 15 seconds?

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

**3. The diagram below shows a block on a horizontal frictionless surface. A 100.-newton force acts on the block at an angle of 30.° above the horizontal.**

What is the magnitude of force F if it establishes equilibrium?

- (1) 50.0 N
**(2) 86.6 N**- (3) 100. N
- (4) 187 N

**4. Approximately how far will an object near Earth’s surface fall in 3.0 seconds?**

- (1) 88 m
**(2) 44 m**- (3) 29 m
- (4) 9.8 m

**5. A 5-newton force directed east and a 5-newton force directed north act concurrently on a point. The resultant of the two forces is**

- (1) 5 N northeast
- (2) 10. N southwest
**(3) 7 N northeast**- (4) 7 N southwest

**6. Into how many possible components can a single force be resolved?**

**(1) an unlimited number**- (2) two components
- (3) three components
- (4) four components at right angles to each other

**7. The graph below represents the relationship between the forces applied to an object and the corresponding accelerations produced.**

What is the inertial mass of the object?

- (1) 1.0 kg
- (2) 2.0 kg
**(3) 0.50 kg**- (4) 1.5 kg

**8. Which is a derived unit?**

- (1) meter
- (2) kilogram
- (3) second
**(4) newton**

**9. What is the magnitude of the gravitational force between two 5.0-kilogram masses separated by a distance of 5.0 meters?**

- (1) 5.0 × 10
^{0}N - (2) 3.3 × 10–
^{10}N **(3) 6.7 × 10–**^{11}N- (4) 1.3 × 10–
^{11}N

**10. What is the displacement of the mass hanger (H) shown in the diagram after a 0.20-kilogram mass is loaded on it? [Assume the hanger is at rest in both positions.]**

- (1) 12.30 cm
- (2) 12.50 cm
**(3) 12.70 cm**- (4) 13.30 cm

**11. Two cars having different weights are traveling on a level surface at different constant velocities. Within the same time interval, greater force will always be required to stop the car that has the greater**

- (1) weight
- (2) kinetic energy
- (3) velocity
**(4) momentum**

**12. A 0.050-kilogram bullet is fired from a 4.0- kilogram rifle that is initially at rest. If the bullet leaves the rifle with momentum having a magnitude of 20. kilogram•meters per second, the rifle will recoil with a momentum having a magnitude of**

- (1) 1,600 kg•m/s
- (2) 80. kg•m/s
**(3) 20. kg•m/s**- (4) 0.25 kg•m/s

**13. A 2.0-kilogram mass weighs 10. newtons on planet X. The acceleration due to gravity on planet X is approximately**

- (1) 0.20 m/s
^{2} **(2) 5.0 m/s**^{2}- (3) 9.8 m/s
^{2} - (4) 20. m/s
^{2}

**Note that questions 14 and 15 have only three choices.**

**14. The graph below represents the motion of an object.**

According to the graph, as time increases, the velocity of the object

- 1. decreases
- 2. increases
**3. remains the same**

**15. A wooden block is at rest on a horizontal steel surface. If a 10.-newton force applied parallel to the surface is required to set the block in motion, how much force is required to keep the block moving at constant velocity?**

**(1) less than 10. N**- (2) greater than 10. N
- (3) 10. N

**16. In the diagram below, a 20.0-newton force is used to push a 2.00-kilogram cart a distance of 5.00 meters.**

The work done on the cart is

**(1) 100. J**- (2) 200. J
- (3) 150. J
- (4) 40.0 J

**Note that questions 17 and 18 have only three choices.**

**17. The diagram below shows two identical wooden planks, A and B, at different incline angles, used to slide concrete blocks from a truck.**

Compared to the amount of work done against friction by a block sliding down plank A, the work done against friction by a block sliding down plank B is

- 1. less
**2. more**- 3. the same

**18. Two vacationers walk out on a horizontal pier as shown in the diagram below**

As they approach the end of the pier, their gravitational potential energy will

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

**19. A girl weighing 500. newtons takes 50. seconds to climb a flight of stairs 18 meters high. Her power output vertically is**

- (1) 9,000 W
- (2) 4,000 W
- (3) 1,400 W
**(4) 180 W**

**20. The graph below represents the elongation of a spring as a function of the applied force.**

How much work must be done to stretch the spring 0.40 meter?

**(1) 4.8 J**- (2) 6.0 J
- (3) 9.8 J
- (4) 24 J

**21. Metal sphere A has a charge of +12 elementary charges and identical sphere B has a charge of +16 elementary charges. After the two spheres are brought into contact, the charge on sphere A is**

- (1) –2 elementary charges
- (2) +2 elementary charges
**(3) +14 elementary charges**- (4) +28 elementary charges

**22. Electrostatic force F exists between two point charges. If the distance between the charges is tripled, the force between the charges will be**

**(1) F/9**- (2) F/3
- (3) 3F
- (4) 9F

**23. Which net charge could be found on an object?**

**(1) +3.2 × 10–**^{18}C- (2) +2.4 × 10–
^{19}C - (3) –1.8 × 10–
^{18}C - (4) –0.80 × 10–
^{19}C

**24. In the diagram below, two identical spheres, A and B, have equal net positive charges.**

Which arrow best represents the direction of their resultant electric field at point P?

**25. How much work is done in moving 5.0 coulombs of charge against a potential difference of 12 volts?**

- (1) 2.4 J
- (2) 12 J
- (3) 30. J
**(4) 60. J**

**26. Compared to insulators, metals are better conductors of electricity because metals contain more free**

- 1. protons
**2. electrons**- 3. positive ions
- 4. negative ions

**27. If a 15-ohm resistor is connected in parallel with a 30.-ohm resistor, the equivalent resistance is**

- (1) 15 Ω
- (2) 2.0 Ω
**(3) 10. Ω**- (4) 45 Ω

**28. Identical charges A, B, and C are located between two oppositely charged parallel plates, as shown in the diagram below.**

The magnitude of the force exerted on the charges by the electric field between the plates is

- 1 least on A and greatest on C
- 2 greatest on A and least on C
- 3 the same on A and C, but less on B
**4 the same for A, B, and C**

**29. A metal wire has length L and cross-sectional area A. The resistance of the wire is directly proportional to**

**30. The diagram below shows electric currents in conductors that meet at junction P.**

What are the magnitude and direction of the current in conductor PQ?

- (1) 9 A toward P
- (2) 9 A toward Q
- (3) 5 A toward P
**(4) 5 A toward Q**

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