NY Regents
June 2009, Part 1
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1. On a highway, a car is driven 80. kilometers during the first 1.00 hour of travel, 50. kilometers during the next 0.50 hour, and 40. kilometers in the final 0.50 hour. What is the car’s average speed for the entire trip?
(1) 45 km/h
(2) 60. km/h
(3) 85 km/h
(4) 170 km/h
2. The vector diagram below represents the horizontal component, F
H
, and the vertical component, F
V
, of a 24-newton force acting at 35° above the horizontal.
What are the magnitudes of the horizontal and vertical components?
(1) F
H
= 3.5 N and F
V
= 4.9 N
(2) F
H
= 4.9 N and F
V
= 3.5 N
(3) F
H
= 14 N and F
V
= 20. N
(4) F
H
= 20. N and F
V
= 14 N
3. Which quantity is a vector?
(1) impulse
(2) power
(3) speed
(4) time
4 A high-speed train in Japan travels a distance of 300. kilometers in 3.60 × 10
3
seconds. What is the average speed of this train?
(1) 1.20 × 10
–2
m/s
(2) 8.33 × 10
–2
m/s
(3) 12.0 m/s
(4) 83.3 m/s
5 A 25-newton weight falls freely from rest from the roof of a building. What is the total distance the weight falls in the first 1.0 second?
(1) 19.6 m
(2) 9.8 m
(3) 4.9 m
(4) 2.5 m
6. A golf ball is given an initial speed of 20. meters per second and returns to level ground. Which launch angle above level ground results in the ball traveling the greatest horizontal distance? [Neglect friction.]
(1) 60.°
(2) 45°
(3) 30.°
(4) 15°
Refer to the following information for the next two questions.
Base your answers to questions 7 and 8 on the information below.
A go-cart travels around a flat, horizontal, circular track with a radius of 25 meters. The mass of the go-cart with the rider is 200. kilograms. The magnitude of the maximum centripetal force exerted by the track on the go-cart is 1200. newtons.
7. What is the maximum speed the 200.-kilogram go-cart can travel without sliding off the track?
(1) 8.0 m/s
(2) 12 m/s
(3) 150 m/s
(4) 170 m/s
8. Which change would increase the maximum speed at which the go-cart could travel without sliding off this track?
(1) Decrease the coefficient of friction between the go-cart and the track.
(2) Decrease the radius of the track.
(3) Increase the radius of the track.
(4) Increase the mass of the go-cart
9. A 0.50-kilogram cart is rolling at a speed of 0.40 meter per second. If the speed of the cart is doubled, the inertia of the cart is
(1) halved
(2) doubled
(3) quadrupled
(4) unchanged
10. Two forces, F
1
and F
2
, are applied to a block on a frictionless, horizontal surface as shown below.
If the magnitude of the block’s acceleration is 2.0 meters per second
2
, what is the mass of the block?
(1) 1 kg
(2) 5 kg
(3) 6 kg
(4) 7 kg
11. Which body is in equilibrium?
(1) a satellite orbiting Earth in a circular orbit
(2) a ball falling freely toward the surface of Earth
(3) a car moving with a constant speed along a straight, level road
(4) a projectile at the highest point in its trajectory
12. What is the weight of a 2.00-kilogram object on the surface of Earth?
(1) 4.91 N
(2) 2.00 N
(3) 9.81 N
(4) 19.6 N
13. A 70-kilogram cyclist develops 210 watts of power while pedaling at a constant velocity of 7.0 meters per second east. What average force is exerted eastward on the bicycle to maintain this constant speed?
(1) 490 N
(2) 30. N
(3) 3.0 N
(4) 0 N
14. The gravitational potential energy, with respect to Earth, that is possessed by an object is dependent on the object’s
(1) acceleration
(2) momentum
(3) position
(4) speed
15. As a ball falls freely toward the ground, its total mechanical energy
(1) decreases
(2) increases
(3) remains the same
16. A spring with a spring constant of 4.0 newtons per meter is compressed by a force of 1.2 newtons. What is the total elastic potential energy stored in this compressed spring?
(1) 0.18 J
(2) 0.36 J
(3) 0.60 J
(4) 4.8 J
17. A distance of 1.0 meter separates the centers of two small charged spheres. The spheres exert gravitational force F
g
and electrostatic force F
e
on each other. If the distance between the spheres’ centers is increased to 3.0 meters, the gravitational force and electrostatic force, respectively, may be represented as
(3) 3F
g
and 3F
e
(4) 9F
g
and 9F
e
18. The electrical resistance of a metallic conductor is inversely proportional to its
(1) temperature
(2) length
(3) cross-sectional area
(4) resistivity
19. In a simple electric circuit, a 24-ohm resistor is connected across a 6.0-volt battery. What is the current in the circuit?
(1) 1.0 A
(2) 0.25 A
(3) 140 A
(4) 4.0 A
20. An operating 100.-watt lamp is connected to a 120-volt outlet. What is the total electrical energy used by the lamp in 60. seconds?
(1) 0.60 J
(2) 1.7 J
(3) 6.0 × 10
3
J
(4) 7.2 × 10
3
J
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