Physical Setting 22 January 2002 Questions Answer Keys

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

Regents High School Examination

Physical Setting

Physics

Tuesday, January 22, 2002 — 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. What is the total displacement of a student who walks 3 blocks east, 2 blocks north, 1 block west, and then 2 blocks south?**

- (1) 0
**(2) 2 blocks east**- (3) 2 blocks west
- (4) 8 blocks

**2. Which measurement of an average classroom door is closest to 1 meter?**

- (1) thickness
**(2) width**- (3) height
- (4) surface area

**3. A group of bike riders took a 4.0-hour trip. During the first 3.0 hours, they traveled a total of 50. kilometers, but during the last hour they traveled only 10. kilometers. What was the group’s average speed for the entire trip?**

**(1) 15 km/hr**- (2) 30. km/hr
- (3) 40. km/hr
- (4) 60. km/hr

**4. A skier starting from rest skis straight down a slope 50. meters long in 5.0 seconds. What is the magnitude of the acceleration of the skier?**

- (1) 20. m/s
^{2} - (2) 9.8 m/s
^{2} - (3) 5.0 m/s
^{2} **(4) 4.0 m/s**^{2}

**5. An object falls freely from rest near the surface of Earth. What is the speed of the object after having fallen a distance at 4.90 meters?**

- (1) 4.90 m/s
**(2) 9.80 m/s**- (3) 24.0 m/s
- (4) 96.1 m/s

**6. Which two terms represent a vector quantity and the scalar quantity of the vector’s magnitude, respectively?**

- (1) acceleration and velocity
- (2) weight and force
- (3) speed and time
**(4) displacement and distance**

**7. A 4.0-kilogram rock and a 1.0-kilogram stone fall freely from rest from a height of 100 meters. After they fall for 2.0 seconds, the ratio of the rock’s speed to the stone’s speed is**

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

**8. Two concurrent forces have a maximum resultant of 45 newtons and a minimum resultant of 5 newtons. What is the magnitude of each of these forces?**

- (1) 0 N and 45 N
- (2) 5 N and 9 N
**(3) 20. N and 25 N**- (4) 0 N and 50. N

**9. In the diagram below, a box is on a frictionless horizontal surface with forces F _{1} and F_{2} acting as shown.**

If the magnitude of F_{1} is greater than the magnitude of F_{2}, then the box is

- (1) moving at constant speed in the direction of F
_{1} - (2) moving at constant speed in the direction of F
_{2} **(3) accelerating in the direction of F**_{1}- (4) accelerating in the direction of F
_{2}

**10. When a satellite is a distance R from the center of Earth, the force due to gravity on the satellite is F. What is the force due to gravity on the satellite when its distance from the center of Earth is 3R?**

**(1) F/9**- (2) F/3
- (3) F
- (4) F9

**11. Which two graphs represent the motion of an object on which the net force is zero?**

**12. The table below lists the coefficients of kinetic friction for four materials sliding over steel.**

A 10.-kilogram block of each of these materials is pulled horizontally across a steel floor at constant velocity. Which block requires the smallest applied force to keep it moving at constant velocity?

- (1) aluminum
- (2) brass
**(3) copper**- (4) steel

**13. The magnitude of the force that a baseball bat exerts on a ball is 50. newtons. The magnitude of the force that the ball exerts on the bat is**

- (1) 5.0 N
- (2) 10. N
**(3) 50. N**- (4) 250 N

**14. A bullet traveling at 5.0 × 10 ^{2} meters per second is brought to rest by an impulse of 50. newton•seconds. What is the mass of the bullet?**

- (1) 1.0 × 10–
^{2}kg **(2) 1.0 × 10–**^{1}kg- (3) 1.0 × 10
^{1}kg - (4) 2.5 × 10
^{4}kg

**15. Which graph best represents the relationship between acceleration due to gravity and mass for objects near the surface of Earth? [Neglect air resistance.]**

**16. What is an essential characteristic of an object in equilibrium?**

- (1) zero velocity
**(2) zero acceleration**- (3) zero potential energy
- (4) zero kinetic energy

**17. The diagram below shows two carts that were initially at rest on a horizontal, frictionless surface being pushed apart when a compressed spring attached to one of the carts is released. Cart A has a mass of 3.0 kilograms and cart B has a mass of 5.0 kilograms.**

If the speed of cart A is 0.33 meter per second after the spring is released, what is the approximate speed of cart B after the spring is released?

- (1) 0.12 m/s
**(2) 0.20 m/s**- (3) 0.33 m/s
- (4) 0.55 m/s

**18. Which graph best represents the relationship between the kinetic energy of a moving object and its velocity?**

**19. How much work is done on a downhill skier by an average braking force of 9.8 × 10 ^{2} newtons to stop her in a distance of 10. meters?**

- (1) 1.0 × 10
^{1}J - (2) 9.8 × 10
^{1}J - (3) 1.0 × 10
^{3}J **(4) 9.8 × 10**^{3}J

**20. A spring has a spring constant of 120 newtons per meter. How much potential energy is stored in the spring as it is stretched 0.20 meter?**

**(1) 2.4 J**- (2) 4.8 J
- (3) 12 J
- (4) 24 J

**21. The graph below shows the relationship between the elongation of a spring and the force applied to the spring causing it to stretch.**

What is the spring constant for this spring?

- (1) 0.020 N/m
- (2) 2.0 N/m
- (3) 25 N/m
**(4) 50. N/m**

**22. Which quantity and unit are correctly paired?**

**23. A 10.-newton force is required to move a 3.0- kilogram box at constant speed. How much power is required to move the box 8.0 meters in 2.0 seconds? **

**(1) 40. W**- (2) 20. W
- (3) 15 W
- (4) 12 W

**24. A 0.10-kilogram ball dropped vertically from a height of l.00 meter above the floor bounces back to a height of 0.80 meter. The mechanical energy lost by the ball as it bounces is**

- (1) 0.080 J
**(2) 0.20 J**- (3) 0.30 J
- (4) 0.78 J

**25. The diagram below shows the arrangement of three charged hollow metal spheres, A, B, and C. The arrows indicate the direction of the electric forces acting between the spheres. At least two of the spheres are positively charged.**

Which sphere, if any, could be negatively charged?

**(1) sphere A**- (2) sphere B
- (3) sphere C
- (4) no sphere

**26. The diagram below shows proton P located at point A near a positively charged sphere.**

If 6.4 × 10–^{19 }joule of work is required to move the proton from point A to point B, the potential difference between A and B is

- (1) 6.4 × 10–
^{19}V - (2) 4.0 × 10–
^{19}V - (3) 6.4 V
**(4) 4.0 V**

**27. An electrostatic force of magnitude F exists between two metal spheres having identical charge q. The distance between their centers is r. Which combination of changes would produce no change in the electrostatic force between the spheres?**

- (1) doubling q on one sphere while doubling r
**(2) doubling q on both spheres while doubling r**- (3) doubling q on one sphere while halving r
- (4) doubling q on both spheres while halving r

**28. What is the magnitude of the electrostatic force acting on an electron located in an electric field having a strength of 5.0 × 10 ^{3} newtons per coulomb?**

- (1) 3.1 × 10
^{22}N - (2) 5.0 × 10
^{3}N **(3) 8.0 × 10–**^{16}N- (4) 3.2 × 10–
^{23}N

**29. A charge of 5.0 coulombs moves through a circuit in 0.50 second. The current in the circuit is**

- (1) 2.5 A
- (2) 5.0 A
- (3) 7.0 A
**(4) 10. A**

**30. An operating electric iron draws a current of 5 amperes and has a resistance of 20 ohms. The amount of energy used by the iron in 40 seconds is**

- (1) 1 × 10
^{2}J - (2) 5 × 10
^{2}J - (3) 4 × 10
^{3}J **(4) 2 × 104 J**

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