Physical Setting 15 June 2011 Questions Answer Keys

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

Regents High School Examination

Physical Setting

Physics

Wednesday, June 15, 2011 — 1:15 to 4:15 p.m., only

**Directions (1–30):** For each statement or question, write in your answer booklet the number of the word or expression that, of those given, best completes the statement or answers the question.

**1. Scalar is to vector as**

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

**2. If a car accelerates uniformly from rest to 15 meters per second over a distance of 100. meters, the magnitude of the car’s acceleration is**

- (1) 0.15 m/s
^{2} **(2) 1.1 m/s**^{2}- (3) 2.3 m/s
^{2} - (4) 6.7 m/s
^{2}

**3. An object accelerates uniformly from 3.0 meters per second east to 8.0 meters per second east in 2.0 seconds. What is the magnitude of the acceleration of the object?**

**(1) 2.5 m/s**^{2}- (2) 5.0 m/s
^{2} - (3) 5.5 m/s
^{2} - (4) 11 m/s
^{2}

**4. A rock is dropped from a bridge. What happens to the magnitude of the acceleration and the speed of the rock as it falls? [Neglect friction.]**

- (1) Both acceleration and speed increase.
- (2) Both acceleration and speed remain the same.
- (3) Acceleration increases and speed decreases.
**(4) Acceleration remains the same and speed increases.**

**5. A soccer ball kicked on a level field has an initial vertical velocity component of 15.0 meters per second. Assuming the ball lands at the same height from which it was kicked, what is the total time the ball is in the air? [Neglect friction.]**

- (1) 0.654 s
- (2) 1.53 s
**(3) 3.06 s**- (4) 6.12 s

**6. A student is standing in an elevator that is accelerating downward. The force that the student exerts on the floor of the elevator must be**

**(1) less than the weight of the student when at rest**- (2) greater than the weight of the student when at rest
- (3) less than the force of the floor on the student
- (4) greater than the force of the floor on the student

**7. The magnitude of the centripetal force acting on an object traveling in a horizontal, circular path will decrease if the**

**(1) radius of the path is increased**- (2) mass of the object is increased
- (3) direction of motion of the object is reversed
- (4) speed of the object is increased

**8. The centripetal force acting on the space shuttle as it orbits Earth is equal to the shuttle’s**

- (1) inertia
- (2) momentum
- (3) velocity
**(4) weight**

**9. As a box is pushed 30. meters across a horizontal floor by a constant horizontal force of 25 newtons, the kinetic energy of the box increases by 300. joules. How much total internal energy is produced during this process?**

- (1) 150 J
- (2) 250 J
**(3) 450 J**- (4) 750 J

**10. What is the power output of an electric motor that lifts a 2.0-kilogram block 15 meters vertically in 6.0 seconds?**

- (1) 5.0 J
- (2) 5.0 W
- (3) 49 J
**(4) 49 W**

**11. Four identical projectiles are launched with the same initial speed, v, but at various angles above the level ground. Which diagram represents the initial velocity of the projectile that will have the largest total horizontal displacement? [Neglect air resistance.]**

**12. Two forces act concurrently on an object on a horizontal, frictionless surface, as shown in the diagram below.**

What additional force, when applied to the object, will establish equilibrium?

- (1) 16 N toward the right
- (2) 16 N toward the left
- (3) 4 N toward the right
**(4) 4 N toward the left**

**13. As shown in the diagram below, an open box and its contents have a combined mass of 5.0 kilograms.**

**A horizontal force of 15 newtons is required to push the box at a constant speed of 1.5 meters per second**

**across a level surface.**

The inertia of the box and its contents increases if there is an increase in the

- (1) speed of the box
**(2) mass of the contents of the box**- (3) magnitude of the horizontal force applied to the box
- (4) coefficient of kinetic friction between the box and the level surface

**14. Which statement describes the kinetic energy and total mechanical energy of a block as it is pulled at constant speed up an incline?**

- (1) Kinetic energy decreases and total mechanical energy increases.
- (2) Kinetic energy decreases and total mechanical energy remains the same.
**(3) Kinetic energy remains the same and total mechanical energy increases.**- (4) Kinetic energy remains the same and total mechanical energy remains the same.

**15. Which diagram represents the electric field lines between two small electrically charged spheres?**

**16. The diagram below represents a view from above of a tank of water in which parallel wave fronts are traveling toward a barrier.**

Which arrow represents the direction of travel for the wave fronts after being reflected from the barrier?

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

**17. Two metal spheres, A and B, possess charges of 1.0 microcoulomb and 2.0 microcoulombs, respectively. In the diagram below, arrow F represents the electrostatic force exerted on sphere B by sphere A.**

Which arrow represents the magnitude and direction of the electrostatic force exerted on sphere A by sphere B?

**18. The diagram below represents a positively charged particle about to enter the electric field between two oppositely charged parallel plates.**

The electric field will deflect the particle

- (1) into the page
- (2) out of the page
- (3) toward the top of the page
**(4) toward the bottom of the page**

**19. What is the total amount of work required to move a proton through a potential difference of 100. volts?**

- (1) 1.60 × 10–
^{21}J **(2) 1.60 × 10–**^{17}J- (3) 1.00 × 10
^{2}J - (4) 6.25 × 10
^{20}J

**20. What is the current through a wire if 240 coulombs of charge pass through the wire in 2.0 minutes?**

- (1) 120 A
**(2) 2.0 A**- (3) 0.50 A
- (4) 0.0083 A

**21. An electric circuit consists of a variable resistor connected to a source of constant potential difference. If the resistance of the resistor is doubled, the current through the resistor is**

**(1) halved**- (2) doubled
- (3) quartered
- (4) quadrupled

**22. Circuit A has four 3.0-ohm resistors connected in series with a 24-volt battery, and circuit B has two 3.0-ohm resistors connected in series with a 24-volt battery. Compared to the total potential drop across circuit A, the total potential drop across circuit B is**

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

**23. How much total energy is dissipated in 10. seconds in a 4.0-ohm resistor with a current of 0.50 ampere?**

- (1) 2.5 J
- (2) 5.0 J
**(3) 10. J**- (4) 20. J

**24. Moving a length of copper wire through a magnetic field may cause the wire to have a**

**(1) potential difference across it**- (2) lower temperature
- (3) lower resistivity
- (4) higher resistance

**25. A pulse traveled the length of a stretched spring. The pulse transferred**

**(1) energy, only**- (2) mass, only
- (3) both energy and mass
- (4) neither energy nor mass

**26. The graph below represents the displacement of a particle in a medium over a period of time.**

The amplitude of the wave is

- (1) 4.0 s
- (2) 6.0 s
- (3) 8 cm
**(4) 4 cm**

**27. What is the period of a water wave if 4.0 complete waves pass a fixed point in 10. seconds?**

- (1) 0.25 s
- (2) 0.40 s
**(3) 2.5 s**- (4) 4.0 s

**28. The diagram below represents a periodic wave.**

Which point on the wave is 90° out of phase with point P?

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

**29. What is the wavelength of a 256-hertz sound wave in air at STP?**

- (1) 1.17 × 10
^{6}m **(2) 1.29 m**- (3) 0.773 m
- (4) 8.53 × 10–
^{7}m

**30. What is the minimum total energy released when an electron and its antiparticle (positron) annihilate each other?**

**(1) 1.64 × 10–**^{13}J- (2) 8.20 × 10–
^{14}J - (3) 5.47 × 10–
^{22}J - (4) 2.73 × 10–
^{22}J

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