Physical Setting 17 June 1998 Questions Answer Keys

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

Regents High School Examination

Physical Setting

Physics

Wednesday, 17 June, 1998 – 1:15 PM to 4:15 PM 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. A car travels 12 kilometers due north and then 8 kilometers due west going from town A to town B. What is the magnitude of the displacement of a helicopter that flies in a straight line from town A to town B?**

- (1) 20. km
**(2) 14 km**- (3) 10. km
- (4) 4 km

**2. What is the approximate diameter of a dinner plate?**

- (1) 0.0025 m
- (2) 0.025 m
**(3) 0.25 m**- (4) 2.5 m

**3. Which two graphs best represent the motion of an object falling freely from rest near Earth’s surface?**

**4. Forces F ^{1} and F^{2} act concurrently on point P, as shown in the diagram below.**

The equilibrant of F^{1} and F^{2} is

**(1) 14 N southwest**- (2) 14 N southeast
- (3) 20. N southwest
- (4) 20. N southeast

**5. What is the average velocity of a car that travels 30. kilometers due west in 0.50 hour?**

- (1) 15 km/hr
- (2) 60. km/hr
- (3) 15 km/hr west
**(4) 60. km/hr west**

**6. A 1.0-kilogram block is placed on each of four friction-less planes inclined at different angles. On which inclined plane will the acceleration of the block be greatest?**

**7. A car having an initial speed of 16 meters per second is uniformly brought to rest in 4.0 seconds. How far does the car travel during this 4.0-second interval?**

**(1) 32 m**- (2) 82 m
- (3) 96 m
- (4) 4.0 m

**8. A man weighs 900 newtons standing on a scale in a stationary elevator. If some time later the reading on the scale is 1200 newtons, the elevator must be moving with**

- 1 constant acceleration downward
- 2 constant speed downward
**3 constant acceleration upward**- 4 constant speed upward

**9. Net force F causes mass m _{1} to accelerate at rate a. A net force of 3F causes mass m_{2} to accelerate at rate 2a. What is the ratio of mass to mass m_{2}?**

- (1) 1:3
**(2) 2:3**- (3) 1:2
- (4) 1:6

**10. What is the magnitude of the gravitational force between an electron and a proton separated by a distance of 1.0 × 10 ^{-47 }meter?**

**(1) 1.0 × 10**^{-47}N- (2) 1.5 × 10
^{-46}N - (3) 1.0 × 10
^{-37}N - (4) 1.5 × 10
^{-36}N

**11. On the surface of planet X, the acceleration due to gravity is 16 meters per second ^{2}. What is the weight of a 60-kilogram mass located on the surf ace of planet X?**

- (1) 27 N
- (2) 5•9 N
**(3) 96 N**- (4) 640 N

**12. A book weighing 20. newtons slides at constant velocity down a ramp inclined 30.° to the honzontal as shown in the diagram below.**

What is the force of friction between the book and the ramp?

**(1) 10. N up the ramp**- (2) 17 N up the ramp
- (3) 10. N down the ramp
- (4) 17 N down the ramp

**13. A 0.60-kilogram softball initially at rest is hit with a bat. The ball is in contact with the bat for 0.20 second and leaves the bat with a speed of 25 meters per second. What is the magnitude of the average force exerted by the ball on the bat?**

- (1) 8.3 N
- (2) 15 N
- (3) 3.0 N
**(4) 75 N**

**14. If the speed of a moving object is doubled, which quantity associated with the object must also double?**

**1 its momentum**- 2 its kinetic energy
- 3 its acceleration
- 4 its gravitational potential energy

**15. The velocity-time graph below represents the motion of a 3-kilogram cart along a straight line. The cart starts at t = 0 and initially moves north.**

What is the magnitude of the change in moment um of the cart between t = 0 and t = 3 seconds?

- (1) 20 kg•m/s
- (2) 30 kg•m/s
**(3) 60 kg•m/s**- (4) 80 kg•m/s

**16. A person kicks a 4.0-kilogram door with a 48-newton force causing the door to accelerate at 12 meters per second ^{2}. What is the magnitude of the force exerted by the door on the person?**

**(1) 48 N**- (2) 24 N
- (3) 12 N
- (4) 4.0 N

**17. A 45-kilogram bicyclist climbs a bill at a constant speed of 2.5 meters per second by applying an average force of 85 newtons. Approximately how much power does the bicyclist develop?**

- (1) 110 W
**(2) 210 W**- (3) 1100 W
- (4) 1400 W

**18. Which action would require no work to be done on an object?**

- 1 lifting the object from the floor to the ceiling
- 2 pushing the object along a horizontal floor against a frictional force
- 3 decreasing the speed of the object until it comes to rest
**4 holding the object stationary above the ground**

**19. The diagram below shows a 1.5-kilogram kitten jumping from the top of a 1.80-meter-high refrigerator to a 0.90-meter-high counter.**

Compared to the kittens gravitational potential energy on top of the refrigerator, the kitten’s gravitational potential energy on top of the counter is

**1 half as great**- 2 twice as great
- 3 one-fourth as great
- 4 four times as great

**20. A 60.-kilogram student running at 3.0 meters per second has a kinetic energy of**

- (1) 180 J
**(2) 270 J**- (3) 540 J
- (4) 8100 J

**21. A student pulls a box across a horizontal floor at a constant speed of 4.0 meters per second by exerting a constant horizontal force of 45 newtons. Approximately how much work does the student do against friction in moving the box 5.5 meters across the floor?**

- (1) 45 J
- (20 180 J
**(3) 250 J**- (4) 740 J

**22. Two plastic rods, A and B, each possess a net negative charge of 1.0 x 10 ^{-3} coulomb. The rods and a positively charged sphere are positioned as shown below.**

Which vector best represents the resultant electrostatic force on the sphere?

**23. A sphere has a net excess charge of – 4.8 x 10 ^{-19} coulomb. The sphere must have an excess of**

- (1) 1 electron
- (2) 1 proton
**(3) 3 electrons**- (4) 3 protons

**24. The diagram below shows two metal spheres suspended by strings and separated by a distance of 3.0 meters. The charge on sphere A is +5.0 × 10 ^{-4} coulomb and the charge on sphere B is +3.0 × 10^{-5} coulomb.**

Which statement best describes the electrical force between the spheres?

**1 It has a magnitude of 15 N and is repulsive.**- 2 It has a magnitude of 45 N and is repulsive.
- 3 It has a magnitude of 15 N and is attractive.
- 4 It has a magnitude of 45 N and is attractive.

**25. Which diagram best represents the electric field near a positively charged conducting sphere?**

**26. Two oppositely charged parallel plates are a fixed distance apart. Which graph best represents the relationship between the electric field intensity (E) between the plates and the potential difference (V) across the plates?**

**27. What is the potential difference across a 2.0-ohm resistor that draws 2.0 coulombs of charge per second?**

- (1) 1.0 V
- (2) 2.0 V
- (3) 3.0 V
**(4) 4.0 V**

**28. The diagram below shows a circuit with three resistors.**

‘What is the resistance of resistor R^{3}?

- (1) 6.0
**Ω** **(2) 2.0 Ω**- (3) 12
**Ω** - (4) 4.0
**Ω**

**29. Three ammeters are placed in a circuit as shown below.**

If A_{1} reads 5.0 amperes and A_{2} reads 2.0 amperes, what does A_{3} read?

- (1) 1.0 A
- (2) 2.0 A
**(3) 3.0 A**- (4) 7.0 A

**30. An electric motor draws 150 amperes of current while operating at 240 volts. What is the power rating of this motor?**

- (1) 1.6 W
- (2) 3.8 × 10
^{2}W **(3) 3.6 × 10**^{4}W- (4) 5.4 × 10
^{6}W

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