Physical Setting 21 June 2000 Questions Answer Keys

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

Regents High School Examination

Physical Setting

Physics

Wednesday, June 21, 2000 — 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 map below shows the route traveled by a school bus.**

What is the magnitude of the total displacement of the school bus from the start to the end of its trip?

- (1) 400 m
- (2) 500 m
**(3) 800 m**- (4) 1,800 m

**2. Which pair of graphs represent the same motion?**

**3. A runner starts from rest and accelerates uniformly to a speed of 8.0 meters per second in 4.0 seconds. The magnitude of the acceleration of the runner is**

- (1) 0.50 m/s
^{2} **(2) 2.0 m/s**^{2}- (3) 9.8 m/s
^{2} - (4) 32 m/s
^{2}

**4. A cart moving across a level surface accelerates uniformly at 1.0 meter per second ^{2} for 2.0 seconds. What additional information is required to determine the distance traveled by the cart during this 2.0-second interval?**

- 1 coefficient of friction between the cart and the surface
- 2 mass of the cart
- 3 net force acting on the cart
**4 initial velocity of the cart**

**5. In the diagram below, a force, F, is applied to the handle of a lawnmower inclined at angle to the ground.**

The magnitude of the horizontal component of force F depends on

- 1 the magnitude of force F, only
- 2 the measure of angle , only
**3 both the magnitude of force F and the measure of angle**- 4 neither the magnitude of force F nor the measure of angle

**6. Equilibrium exists in a system where three forces are acting concurrently on an object. If the system includes a 5.0-newton force due north and a 2.0-newton force due south, the third force must be**

- (1) 7.0 N south
- (2) 7.0 N north
**(3) 3.0 N south**- (4) 3.0 N north

**7 A ball is thrown straight up with a speed of 12 meters per second near the surface of Earth. What is the maximum height reached by the ball? [Neglect air friction.]**

- (1) 15 m
**(2) 7.3 m**- (3) 1.2 m
- (4) 0.37 m

**8. Which object weighs approximately 1 newton?**

- 1 dime
- 2 paper clip
- 3 physics student
**4 golf ball**

**9. Which terms represent a vector quantity and its respective unit?**

- 1 weight — kilogram
- 2 mass — kilogram
**3 force — newton**- 4 momentum — newton

**10. The vector below represents the resultant of two forces acting concurrently on an object at point P.**

Which pair of vectors best represents two concurrent forces that combine to produce this resultant force vector?

**11. Compared to 8 kilograms of feathers, 6 kilograms of lead has**

**1 less mass and less inertia**- 2 less mass and more inertia
- 3 more mass and less inertia
- 4 more mass and more inertia

**12. Two forces are applied to a 2.0-kilogram block on a frictionless horizontal surface, as shown in the diagram below.**

The acceleration of the block is

- (1) 1.5 m/s
^{2}to the right **(2) 2.5 m/s**^{2}to the left- (3) 2.5 m/s
^{2}to the right - (4) 4.0 m/s
^{2}to the left

**13. A 15-kilogram mass weighs 60. newtons on planet X. The mass is allowed to fall freely from rest near the surface of the planet. After falling for 6.0 seconds, the acceleration of the mass is**

- (1) 0.25 m/s
^{2} - (2) 10. m/s
^{2} - (3) 24 m/s
^{2} **(4) 4.0 m/s**^{2}

**14. Sand is often placed on an icy road because the sand**

- 1 decreases the coefficient of friction between the tires of a car and the road
**2 increases the coefficient of friction between the tires of a car and the road**- 3 decreases the gravitational force on a car
- 4 increases the normal force of a car on the road

**15. A 2.0-kilogram cart moving due east at 6.0 meters per second collides with a 3.0-kilogram cart moving due west. The carts stick together and come to rest after the collision. What was the initial speed of the 3.0-kilogram cart? **

- (1) 1.0 m/s
- (2) 6.0 m/s
- (3) 9.0 m/s
**(4) 4.0 m/s**

**16. What is the momentum of a 1,200-kilogram car traveling at 15 meters per second due east?**

- (1) 80. kg•m/s due east
- (2) 80. kg•m/s due west
**(3) 1.8 × 10**^{4}kg•m/s due east- (4) 1.8 × 10
^{4}kg•m/s due west

**17. A 2,400-kilogram car is traveling at a speed of 20. meters per second. Compared to the magnitude of the force required to stop the car in 12 seconds, the magnitude of the force required to stop the car in 6.0 seconds is**

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

**18. A student applies a 20.-newton force to move a crate at a constant speed of 4.0 meters per second across a rough floor. How much work is done by the student on the crate in 6.0 seconds?**

- (1) 80. J
- (2) 120 J
- (3) 240 J
**(4) 480 J**

**19. The gravitational force of attraction between two objects would be increased by**

**1 doubling the mass of both objects, only**- 2 doubling the distance between the objects, only
- 3 doubling the mass of both objects and doubling the distance between the objects
- 4 doubling the mass of one object and doubling the distance between the objects

**20. A 5.0 × 102-newton girl takes 10. seconds to run up two flights of stairs to a landing, a total of 5.0 meters vertically above her starting point. What power does the girl develop during her run?**

- (1) 25 W
- (2) 50. W
**(3) 250 W**- (4) 2,500 W

**21. The kinetic energy of a 980-kilogram race car traveling at 90. meters per second is approximately**

- (1) 4.4 × 104 J
- (2) 8.8 × 104 J
**(3) 4.0 × 106 J**- (4) 7.9 × 106 J

**22. Two aluminum spheres of identical mass and identical charge q hang from strings of equal length. If the spheres are in equilibrium, which diagram best represents the direction of each force acting on the spheres?**

**23. Moving 2.0 coulombs of charge a distance of 6.0 meters from point A to point B within an electric field requires a 5.0-newton force. What is the electric potential difference between points A and B?**

- (1) 60. V
- (2) 30. V
**(3) 15 V**- (4) 2.5 V

**24. A metal sphere having an excess of +5 elementary charges has a net electric charge of**

- (1) 1.6 × 10–
^{19}C **(2) 8.0 × 10–**^{19}C- (3) 5.0 × 10
^{0}C - (4) 3.2 × 10
^{19}C

**25. The graph below represents the relationship between the force applied to a spring and the compression (displacement) of the spring.**

What is the spring constant for this spring?

- (1) 1.0 N/m
**(2) 2.5 N/m**- (3) 0.20 N/m
- (4) 0.40 N/m

**26. A lightning bolt transfers 6.0 coulombs of charge from a cloud to the ground in 2.0 × 10–3 second. What is the average current during this event?**

- (1) 1.2 × 10–
^{2}A - (2) 3.0 × 10
^{2}A **(3) 3.0 × 10**^{3}A- (4) 1.2 × 10
^{4}A

**27. Conductivity in metallic solids is due to the presence of free**

- 1 nuclei
- 2 protons
- 3 neutrons
**4 electrons**

**28. The diagram below shows the initial charge and position of three metal spheres, X, Y, and Z, on insulating stands.**

Sphere X is brought into contact with sphere Y and then removed. Then sphere Y is brought into contact with sphere Z and removed. What is the charge on sphere Z after this procedure is completed?

**(1) +1 × 10–**^{6}C- (2) +2 × 10–
^{6} - (3) +3 × 10–
^{6}C - (4) +4 × 10–
^{6}C

**29. In the diagram below, a student compresses the spring in a pop-up toy 0.020 meter.**

If the spring has a spring constant of 340 newtons per meter, how much energy is being stored in the spring?

**(1) 0.068 J**- (2) 0.14 J
- (3) 3.4 J
- (4) 6.8 J

**30. Gravitational field strength is to newtons per kilogram as electric field strength is to**

- 1 coulombs per joule
- 2 coulombs per newton
- 3 joules per coulomb
**4 newtons per coulomb**

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