Physical Setting 20 June 2001 Questions Answer Keys

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

Regents High School Examination

Physical Setting

Physics

Wednesday, June 20, 2001 — 1:15 to 4:15 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. Which terms both represent scalar quantities?**

- (1) displacement and velocity
**(2) distance and speed**- (3) displacement and speed
- (4) distance and velocity

**2. A mass of one kilogram of nickels has a monetary value in United States dollars of approximately**

- (1) $1.00
- (2) $0.10
**(3) $10.00**- (4) $1000.00

**3. Which graph best represents the motion of an object whose speed is increasing?**

**4. An astronaut weighs 500 newtons on Earth and 25 newtons on asteroid X. The acceleration due to gravity on asteroid X is approximately**

- (1) 1 m/s
^{2} - (2) 2 m/s
^{2} - (3) 0.2 m/s
^{2} **(4) 0.5 m/s**^{2}

**5. A car having an initial velocity of 12 meters per second east slows uniformly to 2 meters per second east in 4.0 seconds. The acceleration of the car during this 4.0-second interval is**

**(1) 2.5 m/s**^{2}west- (2) 2.5 m/s
^{2}east - (3) 6.0 m/s
^{2}west - (4) 6.0 m/s
^{2}east

**6. Two students push on a sled. One pushes with a force of 30. newtons east and the other exerts a force of 40. newtons south, as shown in the topview diagram below.**

Which vector best represents the resultant of these two forces?

**7. In an automobile collision, a 44-kilogram passenger moving at 15 meters per second is brought to rest by an air bag during a 0.10-second time interval. What is the magnitude of the average force exerted on the passenger during this time?**

- (1) 440 N
- (2) 660 N
- (3) 4400 N
**(4) 6600 N**

**8. A series of unbalanced forces was applied to each of two blocks, A and B. The graphs below show the relationship between unbalanced force and acceleration for each block. Compared to the mass of block A, the mass of block B is**

- (1) the same
**(2) twice as great**- (3) half as great
- (4) four times as great

**9. Two cars, A and B, are 400. meters apart. Car A travels due east at 30. meters per second on a collision course with car B, which travels due west at 20. meters per second. How much time elapses before the two cars collide?**

**(1) 8.0 s**- (2) 13 s
- (3) 20. s
- (4) 40. s

**10. A 50.-newton horizontal force is needed to keep an object weighing 500. newtons moving at a constant velocity of 2.0 meters per second across a horizontal surface. The magnitude of the frictional force acting on the object is**

- (1) 500. N
- (2) 450. N
**(3) 50. N**- (4) 0 N

**11. The diagram below represents a block sliding down an incline.**

Which vector best represents the frictional force acting on the block?

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

**12. A different force is applied to each of four 1-kilogram blocks to slide them across a uniform steel surface at constant speed as shown below. In which diagram is the coefficient of friction between the block and steel smallest?**

**13. The magnitude of the momentum of an object is 64.0 kilogram•meter per second. If the velocity of the object is doubled, the magnitude of the momentum of the object will be**

- (1) 32.0 kg•m/s
- (2) 64.0 kg•m/s
**(3) 128 kg•m/s**- (4) 256 kg•m/s

**14. An airplane originally at rest on a runway accelerates uniformly at 6.0 meters per second2 for 12 seconds. During this 12-second interval, the airplane travels a distance of approximately**

- (1) 72 m
- (2) 220 m
**(3) 430 m**- (4) 860 m

**15. Satellite A has a mass of 1.5 × 10 ^{3} kilograms and is traveling east at 8.0 × 103 meters per second. Satellite B is traveling west at 6.0 × 10^{3} meters per second. The satellites collide head-on and come to rest. What is the mass of satellite B?**

- (1) 2.7 × 10
^{3}kg **(2) 2.0 × 10**^{3}kg- (3) 1.5 × 10
^{3}kg - (4) 1.1 × 10
^{3}kg

**16. Which combination of units can be used to express work?**

**17. A 2000-watt motor working at full capacity can vertically lift a 400-newton weight at a constant speed of**

- (1) 2 × 10
^{3}m/s - (2) 50 m/s
**(3) 5 m/s**- (4) 0.2 m/s

**18. Which graph best represents the relationship between gravitational potential energy (PE) and height (h) above the ground for an object near the surface of Earth?**

**19. An alpha particle consists of two protons and two neutrons. The alpha particle’s charge of +2 elementary charges is equivalent to**

- (1) 8.0 × 10–
^{20}C **(2) 3.2 × 10–**^{19}C- (3) 1.2 × 10
^{19}C - (4) 3.2 × 10
^{19}C

**20. A 3.0-kilogram mass is attached to a spring having a spring constant of 30. newtons per meter. The mass is pulled 0.20 meter from the spring’s equilibrium position and released. What is the maximum kinetic energy achieved by the massspring system?**

- (1) 2.4 J
- (2) 1.5 J
- (3) 1.2 J
**(4) 0.60 J**

**21. The diagram below shows block A, having mass 2m and speed v, and block B having mass m and speed 2v.**

Compared to the kinetic energy of block A, the kinetic energy of block B is

- (1) the same
**(2) twice as great**- (3) one-half as great
- (4) four times as great

**22. Two similar metal spheres possessing +1.0 coulomb of charge and –1.0 coulomb of charge, respectively, are brought toward each other. Which graph best represents the relationship between the magnitude of the electric force between the spheres and the distance between them?**

**23. The diagram below shows two metal spheres charged to +1.0 × 10– ^{6} coulomb and +3.0 × 10–^{6} coulomb, respectively, on insulating stands separated by a distance of 0.10 meter.**

The spheres are touched together and then returned to their original positions. As a result, the magnitude of the electrostatic force between the spheres changes from 2.7 N to

- (1) 1.4 N
- (2) 1.8 N
**(3) 3.6 N**- (4) 14 N

**24. An electrostatic force of 20. newtons is exerted on a charge of 8.0 × 10– ^{2} coulomb at point P in an electric field. The magnitude of the electric field intensity at P is**

- (1) 4.0 × 10–
^{3}N/C - (2) 1.6 N/C
- (3) 20. N/C
**(4) 2.5 × 10**^{2}N/C

**25. Which diagram best represents the electric field around a negatively charged conducting sphere?**

**26. A 12-volt automobile battery has 8.4 × 10 ^{3} coulombs of electric charge. The amount of electrical energy stored in the battery is approximately**

**(1) 1.0 × 10**^{5}J- (2) 8.4 × 10
^{3} - (3) 7.0 × 10
^{2}J - (4) 1.4 × 10–
^{3}J

**27. Which graph best represents the relationship between potential difference across a metallic conductor and the resulting current through the conductor at a constant temperature?**

**28. Plastic insulation surrounds a wire having diameter d and length as shown below.**

A decrease in the resistance of the wire would be produced by an increase in the

- (1) thickness of the plastic insulation
**(2) length of the wire**- (3) diameter d of the wire
- (4) temperature of the wire

**29. Which diagram below correctly shows currents traveling near junction P in an electric circuit?**

**30. The diagram below shows three resistors, R ^{1}, R^{2}, and R^{3}, connected to a 12-volt battery**

If voltmeter V_{1} reads 3 volts and voltmeter V_{2} reads 4 volts, what is the potential drop across resistor R_{3}?

- (1) 12 V
**(2) 5 V**- (3) 0 V
- (4) 4 V

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