Work, Power, Energy
Which quantity is a vector?
1. impulse 2. power
3. speed 4. time
1. Impulse
If 10 coulombs of charge are transferred through an electric circuit in 5.0 seconds, then the current in the circuit is
2.0 A
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
4. unchanged
A 0.0600-kilogram ball traveling at 60.0 meters per second hits a concrete wall. What speed must a 0.0100-kilogram bullet have in order to hit the wall with the same magnitude of momentum as the ball?
360. m/s
A curling stone is moving along a frictionless curling sheet and is being pushed by a constant horizontal force from a player. The stone must be...
moving at a constant acceleration
If the speed of a car is doubled, the kinetic energy of the car is
1. quadrupled 2. quartered
3. doubled 4. halved
1. Quadrupled
A charge of 30 coulombs passes through a 24-ohm resistor in 6.0 seconds. What is the current through the resistor?
5.0 A
A 15-kilogram cart is at rest on a horizontal surface. A 5-kilogram box is placed in the cart. Compared to the mass and inertia of the cart, the cart-box system has
more mass and more inertia
A 3.1-kilogram gun initially at rest is free to move. When a 0.015-kilogram bullet leaves the gun with a speed of 500 meters per second, what is the speed of the gun?
2.4 m/s
An object is moving at constant speed. Which statement MUST be true?
A. The acceleration of the object must be zero B. The direction of the object is not changing C. The velocity of the object is constant D. All of the above E. None of the above
E. None of the above
A motor used 120 watts of power to raise a 15 newton object in 5.0 seconds. Through what vertical distance was the object raised?
40 m
A net charge of 5.0 coulombs passes a point on a conductor in 0.050 second. The average current is
1.0 × 102 A
Which person has the greatest inertia?
1. A 110-kg wrestler resting on a mat
2. A 90-kg man walking at 2 m/s
3. A 70-kg long-distance runner traveling 5 m/s
4. A 50-kg girl sprinting at 10 m/s
1. A 110-kg wrestler resting on a mat
A 1,200-kilogram car traveling at 10 meters per second hits a tree and is brought to rest in 0.10 second. What is the magnitude of the average force acting on the car to bring it to rest?
-120,000N
A car begins driving from a stationary position. It accelerates at 4 m/s2 for 10 seconds, then travels at a steady speed for another 10 seconds, all in the same direction. How much distance has it covered since it started driving?
600m
What is the average power developed by a motor as it lifts a 400-kilogram mass at a constant speed through a vertical distance of 10 meters in 8 seconds?
4900 W
An MP3 player draws a current of 0.120 ampere from a 3.00-volt battery. What is the total charge that passes through the player in 900 seconds?
108 C
If the sum of all the forces acting on a moving object is zero, the object will
slow down and stop
At the circus, a 100-kilogram clown is fired 15 meters per second from a 500-kilogram cannon. What is the recoil speed of the cannon?
3.0 m/s
John stands on the ground and throws a ball directly upwards with a velocity of 5 m/s. What will be the final velocity v of the ball just before it hits the ground? A. v = 0 m/s B. v = 5 m/s C. v = – 5 m/s D. v > 5 m/s E. v < – 5 m/s
E. v < – 5 m/s
A 1.00-kilogram ball is dropped from the top of a building. Just before striking the ground, the ball’s speed is 12.0 meters per second. What was the ball’s gravitational potential energy, relative to the ground, at the instant it was dropped?
72.0 J
What is the magnitude of the electric field intensity at a point where a proton experiences an electrostatic force of magnitude 2.30 × 10-25 newton?
1.44 × 10-6 N/C
A 4.0-kilogram object is accelerated at 3.0 meters per second2 north by an unbalanced force. The same unbalanced force acting on a 2.0-kilogram object will accelerate this object toward north at
6.0 m/s2
A 50-kilogram student threw a 0.40-kilogram ball with a speed of 20 meters per second. What was the magnitude of the impulse that the student exerted on the ball?
8.0
Which of the below can be true at the same time? A. I only B. II only C. IV only D. III and IV E. I, III, and IV
I. Velocity: Constant; Acceleration: Constant II. Velocity: Constant; Acceleration: Changing III. Velocity: Changing; Acceleration: Constant IV. Velocity: Changing; Acceleration: Changing
E. I, III, and IV