momentum. which object has the greatest momentum? (a) a 5.00-kg mass moving at 10.0 m/s (b) a...
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MomentumMomentum
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Which object has the greatest Which object has the greatest momentum?momentum?
(A) a 5.00-kg mass moving at 10.0 m/s(A) a 5.00-kg mass moving at 10.0 m/s(B) a 10.0-kg mass moving at 1.00 m/s(B) a 10.0-kg mass moving at 1.00 m/s(C) a 15.0-kg mass moving at 10.0 m/s(C) a 15.0-kg mass moving at 10.0 m/s(D) a 20.0-kg mass moving at 1.00 m/s(D) a 20.0-kg mass moving at 1.00 m/s
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What is the speed of a 1.0×103-kg car that has a momentum of 2.0×104 kg•m/ s east?
(A) 5.0 × 10–2 m/s(B) 2.0 × 101 m/s(C) 1.0 × 104 m/s(D) 2.0 × 107 m/s
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ImpulseImpulse
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A 60-kg rollerskater exerts a 10-N force on a 30-kg rollerskater for 0.20 second. What is the magnitude of the impulse applied to the 30-kg rollerskater?
(A) 50 N•s(B) 2.0 N•s(C) 6.0 N•s (D) 12 N•s
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A 0.149-kilogram baseball, initially moving at 15 meters per second, is brought to rest in 0.040 second by a baseball glove on a catcher’s hand. The magnitude of the average force exerted on the ball by the glove is
(A) 2.2 N (B) 2.9 N (C) 17 N(D) 56 N
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ElasticElastic
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At the circus, a 100-kilogram clown is fired at 15 meters per second from a 500-kilogram cannon. What is the recoil speed of the cannon?
(A) 75 m/s(B) 15 m/s(C) 3.0 m/s (D) 5.0 m/s
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Ball A of mass 5.0 kg moving at 20 m/s collides with ball B of unknown mass moving at 10 m/s in the same direction. After the collision, ball A moves at 10 m/s and ball B at 15 m/s, both still in the same direction. What is the mass of ball B?
(A) 6.0 kg(B) 2.0 kg(C) 10. kg (D) 12 kg
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InelasticInelastic
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A 3.0-kg steel block is at rest on a friction-less horizontal surface. A 1.0-kg lump of clay is propelled horizontally at 6.0 m/s toward the block. Upon collision, the clay and steel block stick together and move to the right with a speed of
(A) 1.5 m/s(B) 3.0 m/s(C) 6.0 m/s (D) 2.0 m/s
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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 m/s, what is the speed of the gun?
(A) 0.0 m/s (B) 2.4 m/s (C) 7.5 m/s (D) 500 m/s
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At the circus, a 100-kg clown is fired at 15 m/s from a 500-kg cannon. What is the recoil speed of the cannon?
(A) 75 m/s(B) 3.0 m/s (C) 15 m/s(D) 5.0 m/s
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ENERGYENERGY
LCHSLCHS
Dr.EDr.E
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An egg is dropped from a third-story window. The distance the egg falls from the window to the ground is closest to
(A) 100 m(B) 101 m(C) 102 m (D) 103 m
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Which body is in equilibrium?
(A) a satellite orbiting Earth in a circular orbit
(B) a ball falling freely toward the surface of Earth
(C) a car moving with a constant speed along a straight, level road
(D) a projectile at the highest point in its trajectory
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WorkWork
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A student does 60 joules of work pushing a 3.0-kilogram box up the full length of a ramp that is 5.0 meters long. What is the magnitude of the force applied to the box to do this work?
(A) 20 N (B) 15 N (C) 12 N (D) 4.0 N
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Which combination of fundamental units can be used to express energy?
(A) kg•m/s(B) kg•m2/s (C) kg•m/s2
(D) kg•m2/s2
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The diagram shows points A, B, and C at or near Earth’s surface. As a mass is moved from A to B, 100 joules of work are done against gravity. What is the amount of work done against gravity as an identical mass is moved from A to C?(A) 100 J (B) 173 J (C) 200 J (D) 273 J
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Kinetic EnergyKinetic Energy
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A 15.0-kilogram mass is moving at 7.50 meters per second on a horizontal, frictionless surface. What is the total work that must be done on the mass to increase its speed to 11.5 meters per second?
(A) 120 J(B) 422 J (C) 570 J(D) 992 J
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A 75-kilogram bicyclist coasts down a hill at a constant speed of 12 meters per second. What is the kinetic energy of the bicyclist?
(A) 4.5 × 102 J (B) 9.0 × 102 J(C) 5.4 × 103 J(D) 1.1 × 104 J
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If the speed of a car is doubled, the kinetic energy of the car is
(A) quadrupled(B) quartered (C) doubled(D) halved
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Potential Potential EnergyEnergy
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The gravitational potential energy, with respect to Earth, that is possessed by an object is dependent on the object’s
(A) acceleration(B) momentum(C) position (D) speed
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The diagram represents a 155-N box on a ramp. Applied force F causes the box to slide from point A to point B. What is the total amount of gravitational potential energy gained by the box?
(A) 28.4 J (B) 279 J (C) 868 J (D) 2740 J
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A 60-kg student climbs a ladder a vertical distance of 4.0 meters in 8.0 seconds. Approximately how much total work is done against gravity by the student during the climb?
(A) 2.4 × 103 J(B) 2.9 × 102 J (C) 2.4 × 102 J(D) 3.0 × 101 J
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PowerPower
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A boat weighing 9.0 × 102 Newtons requires a horizontal force of 6.0 × 102 Newtons to move it across the water at 1.5 × 101 meters per second. The boat’s engine must provide energy at the rate of
(A) 2.5 × 10–2 J(B) 4.0 × 101 W (C) 7.5 × 103 J(D) 9.0 × 103 W
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A 70-kg cyclist develops 210 Watts of power while pedaling at a constant velocity of 7.0 m/s east. What average force is exerted eastward on the bicycle to maintain this constant speed?
(A) 490 N(B) 30 N(C) 3.0 N (D) 0 N
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Conservation of Conservation of EnergyEnergy
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A 1-kilogram rock is dropped from a cliff 90 meters high. After falling 20 meters, the kinetic energy of the rock is approximately
(A) 20 J (B) 200 J (C) 700 J(D) 900 J
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A ball is dropped from the top of a cliff. Which graph best represents the relationship between the ball’s total energy and elapsed time as the ball falls to the ground? [Neglect friction.]