Physics Review #1

LCHSDr.E

A girl leaves a history classroom and walks 10 meters north to a drinking fountain. Then she turns and walks 30 meters south to an art classroom. What is the girl’s total displacement from the history classroom to the art classroom?

(A) 20 m south (C) 40 m south(B) 20 m north (D) 40 m north

One car travels 40 meters due east in 5.0 seconds, and a second car travels 64 meters due west in 8.0 seconds. During their periods of travel, the cars definitely had the same

(A) average velocity(B) total displacement(C) change in momentum(D) average speed

A skater increases her speed uniformly from 2.0 m/s to 7.0 m/s over a distance of 12 meters. The magnitude of her acceleration as she travels this 12 meters is

(A) 1.9 m/s2 (C) 2.4 m/s2

(B) 2.2 m/s2 (D) 3.8 m/s2

A ball thrown vertically upward reaches a maximum height of 30 meters above the surface of Earth. At its maximum height, the speed of the ball is

(A) 0.0 m/s (C) 9.8 m/s(B) 3.1 m/s (D) 24 m/s

Which object has the most inertia?

(A) a 0.001-kilogram bumblebee traveling at 2 meters per second

(B) a 0.1-kilogram baseball traveling at 20 meters per second

(C) a 5-kilogram bowling ball traveling at 3 meters per second

(D) a 10-kilogram sled at rest

A child kicks a ball with an initial velocity of 8.5 meters per second at an angle of 35º with the horizontal, as shown. The ball has an initial vertical velocity of 4.9 meters per second and a total time of flight of 1.0 second.

The horizontal component of the ball’s initial velocity is approximately

(A) 3.6 m/s (B) 4.9 m/s (C) 7.0 m/s (D) 13 m/s

A child kicks a ball with an initial velocity of 8.5 meters per second at an angle of 35º with the horizontal, as shown. The ball has an initial vertical velocity of 4.9 meters per second and a total time of flight of 1.0 second.

The maximum height reached by the ball is approximately

(A) 1.2 m (B) 2.5 m (C) 4.9 m (D) 8.5 m

A ball of mass M at the end of a string is swung in a horizontal circular path of radius R at constant speed V. Which combination of changes would require the greatest increase in the centripetal force acting on the ball?

(A) doubling V and doubling R(B) doubling V and halving R(C) halving V and doubling R(D) halving V and halving R

A box is pushed toward the right across a classroom floor. The force of friction on the box is directed toward the

(A) left (B) right (C) ceiling (D) floor

A 40-kilogram mass is moving across a horizontal surface at 5.0 meters per second. What is the magnitude of the net force required to bring the mass to a stop in 8.0 seconds?

(A) 1.0 N (B) 5.0 N (C) 25 N (D) 40 N

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

If the speed of a car is doubled, the kinetic energy of the car is

(A) quadrupled(B) quartered (C) doubled(D) halved

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

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

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

A high school physics student is sitting in a seat reading this question. The magnitude of the force with which the seat is pushing up on the student to support him is closest to

(A) 0N (B) 60 N(C) 600N(D) 6,000 N

The diagram above represents a 5.0-N force and a 12-N force acting on point P. The resultant of the two forces has a magnitude of(A) 5.0-N (B) 7.0-N (C) 12-N (D) 13-N

What does the slope of this graph represent?(A) impulse (B) momentum (C) speed (D) power

What does the area under the slope of this graph represent?

(A) impulse (B) momentum (C) speed (D) power

A ball dropped from rest falls freely until it hits the ground with a speed of 20 m/s. The time during which the ball is in free fall is approximately

(A) 1 s(B) 0.5 s (C) 2 s(D) 10 s

In a 4.0-kilometer race, a runner completes the first kilometer in 5.9 minutes, the second kilo- meter in 6.2 minutes, the third kilometer in 6.3 minutes, and the final kilometer in 6.0 minutes. The average speed of the runner for the race is approximately

(A) 0.16 km/min (C) 12 km/min (B) 0.33 km/min (D) 24 km/min

A golf ball is hit with an initial velocity of 15 m/s at an angle of 35 degrees above the horizontal. What is the vertical component of the golf ball’s initial velocity?

(A) 8.6 m/s (C) 12 m/s (B) 9.8 m/s (D) 15 m/s

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

A 10-kilogram block is at rest on a plane inclined at 15° to the horizontal. As the angle of the incline is increased to 30°, the mass of the block will

(A) decrease (B) increase (C) remain the same

If the direction of a moving car changes and its speed remains constant, which quantity must remain the same?

(A) velocity(B) displacement (C) momentum(D) kinetic energy

Two carts are pushed apart by an expanding spring. If the average force on the 1-kilogram cart is 1 newton, what is the average force on the 2-kilogram cart?

(A) 1 N(B) 0.5 N (C) 0.0 N(D) 4 N

A lab cart is loaded with different masses and moved at various velocities. Which diagram shows the cart-mass system with the greatest inertia?

A sled and rider slide down a snow-covered hill that makes an angle of 30° with the horizontal. Which vector best represents the direction of the normal force, FN, exerted by the hill on the sled?

What is the gravitational potential energy with respect to the surface of the water of a 75.0-kg diver located 3.00 m above the water?

(A) 2.17104 J (B) 2.21103 J(C) 2.25102 J (D) 2.29101 J

A 60.0-kilogram runner has 1920 joules of kinetic energy. At what speed is she running?

(A) 5.66 m/s (B) 8.00 m/s(C) 32.0 m/s (D) 64.0 m/s

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

Which pair of graphs represents the same motion of an object?

The vector diagram represents two forces, F1 and F2, simultaneously acting on an object. Which vector best represents the resultant of the two forces?

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

The diagram above shows a5.00-kilogram block at reston a horizontal, frictionless table Which diagram best represents the force exerted on the block by the table?

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?

(A) 45 km/h(B) 60. km/h(C) 85 km/h (D) 170 km/h

Which quantity is a vector?

(A) impulse(B) speed (C) power(D) time

A high-speed train in Japan travels a distance of 300 kilometers in 3.60 × 103 seconds. What is the average speed of this train?

(A) 1.20 × 10–2 m/s(B) 12.0 m/s (C) 8.33 × 10–2 m/s(D) 83.3 m/s

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?

(A) 19.6 m (B) 9.8 m(C) 4.9 m (D) 2.5 m

A golf ball is given an initial speed of 20 m/s and returns to level ground. Which launch angle above level ground results in the ball traveling the greatest horizontal distance? [Neglect friction.]

(A) 60°(B) 45°(C) 30° (D) 15°

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

(A) halved (B) doubled(C) quadrupled (D) unchanged

Two forces, F1 and F2, are applied to a block on a frictionless, horizontal surface. If the magnitude of the block’s acceleration is 2.0 m/s2, what is the mass of the block?

(A) 1kg (B) 5kg (C) 6kg (D) 7kg

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

What is the weight of a 2.00-kilogram object on the surface of Earth?

(A) 4.91 N (B) 2.00 N(C) 9.81 N (D) 19.6 N

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

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

As a ball falls freely toward the ground, its total mechanical energy

(A) decreases (B) increases (C) remains the same

When Earth and the Moon are separated by a distance of 3.84 × 108 meters, the magnitude of the gravitational force of attraction between them is 2.0 × 1020 Newtons. What would be the magnitude of this gravitational force of attraction if Earth and the Moon were separated by a distance of 1.92 × 108 meters?(A) 5.0 × 1019 N (B) 2.0 × 1020 N(C) 4.0 × 1020 N (D) 8.0 × 1020 N

What is the acceleration of the car at t = 5.0 seconds?(A) 0 m/s2 (B) 2.0 m/s2 (C) 2.5 m/s2 (D) 10 m/s2

What is the total distance traveled by the car during this 6.0-second interval?(A) 10 m (B) 20 m (C) 40 m (D) 60 m

A person weighing 785 Newtons on the surface of Earth would weigh 298 Newtons on the surface of Mars. What is the magnitude of the gravitational field strength on the surface of Mars?

(A) 2.63 N/kg (B) 3.72 N/kg(C) 6.09 N/kg(D) 9.81 N/kg

A motorcycle being driven on a dirt path hits a rock. Its 60-kilogram cyclist is projected over the handlebars at 20 meters per second into a haystack. If the cyclist is brought to rest in 0.50 second, the magnitude of the average force exerted on the cyclist by the haystack is

(A) 6.0 × 101 N(B) 5.9 × 102 N(C) 1.2 × 103 N (D) 2.4 × 103 N

A boy pushes his wagon at constant speed along a level sidewalk. The graph represents the relationship between the horizontal force exerted by the boy and the distance the wagon moves. What is the total work done by the boy in pushing the wagon 4.0 meters?(A) 5.0 J (B) 7.5 J (C) 120 J (D) 180 J

A boy pushes his wagon at constant speed along a level sidewalk. The graph represents the relationship between the horizontal force exerted by the boy and the distance the wagon moves.As the boy pushes the wagon, what happens to the wagon’s energy?

(A) Gravitational potential energy increases. (B) Gravitational potential energy decreases. (C) Internal energy increases. (D) Internal energy decreases.

Which is an SI unit for work done on an object?

A. kg · m2 B. kg · ms2 s

C. kg · m2 D. kg · ms s2

A motorboat, which has a speed of 5.0 m/s in still water, is headed east as it crosses a river flowing south at 3.3 m/s. What is the magnitude of the boat’s resultant velocity with respect to the starting point?

(A) 3.3 m/s (B) 5.0 m/s (C) 6.0 m/s(D) 8.3 m/s

A car traveling on a straight road at 15.0 m/s accelerates uniformly to a speed of 21.0 m/s in 12.0 seconds. The total distance traveled by the car in this 12.0-second time interval is

(A) 36.0 m (B) 180 m (C) 216 m (D) 252 m

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

Which body is in equilibrium?

(A) a satellite moving around Earth in a circular orbit

(B) a cart rolling down a frictionless incline

(C) an apple falling freely toward the surface of Earth

(D) a block sliding at constant velocity across a tabletop

A student standing on the roof of a 50.0-meter-high building kicks a stone at a horizontal speed of 4.00 meters per second. How much time is required for the stone to reach the level ground below? [Neglect friction.]

(A) 3.19 s(B) 5.10 s (C) 10.2 s(D) 12.5 s

On the surface of Earth, a spacecraft has a mass of 2.00 × 104 kilograms. What is the mass of the spacecraft at a distance of one Earth radius above Earth’s surface?

(A) 5.00 × 103 kg(B) 2.00 × 104 kg (C) 4.90 × 104 kg(D) 1.96 × 105 kg

A student pulls a 60-Newton sled with a force having a magnitude of 20 Newtons. What is the magnitude of the force that the sled exerts on the student?

(A) 20 N(B) 40 N (C) 60 N(D) 80 N

Object Mass (kg) Speed (m/s)A 4 6B 6 5C 8 4D 10 1.5

Which object has the greatest inertia?

(A) A(B) B (C) C(D) D

The magnitude of the acceleration of block B is

(A) 6.0 m/s2 (B) 2.0 m/s2 (C) 3.0 m/s2

(D) 4.0 m/s2

A ball is thrown vertically upward with an initial velocity of 29.4 m/s. What is the maximum height reached by the ball?

(A) 14.7 m (B) 29.4 m (C) 44.1 m(D) 88.1 m

The diagram represents a mass, m, being swung clockwise at constant speed in a Horizontal circle. At the instant shown, the centripetal force acting on mass m is directed toward point

(A) A (B) B (C) C (D) D

The diagram represents a mass, m, being swung clockwise at constant speed in a Horizontal circle. If the string were cut at the instant shown, m would hit

(A) A (B) B (C) C (D) D

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

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

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

As viewed from Earth, the light from a star has lower frequencies than the light emitted by the star because the star is

(A) moving toward Earth(B) moving away from Earth(C) stationary

The total work done in lifting a typical high school physics textbook a vertical distance of 0.10 meter is approximately

(A) 0.15 J (B) 1.5 J(C) 15 J(D) 150 J

A small electric motor is used to lift a 0.50-kilogram mass at constant speed. If the mass is lifted a vertical distance of 1.5 meters in 5.0 seconds, the average power developed by the motor is

(A) 0.15 W (B) 1.5 W (C) 3.8 W(D) 7.5 W

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.]

A child, starting from rest at the top of a playground slide, reaches a speed of 7.0 meters per second at the bottom of the slide. What is the vertical height of the slide? [Neglect friction.]

(A) 0.71 m (B) 1.4 m (C) 2.5 m(D) 3.5 m

A student throws a baseball vertically upward and then catches it. If vertically upward is considered to be the positive direction, which graph best represents the relationship between velocity and time for the baseball?

A 5.0-kilogram sphere, starting from rest, falls freely 22 meters in 3.0 seconds near the surface of a planet. Compared to the acceleration due to gravity near Earth’s surface, the acceleration due to gravity near the surface of the planet is approximately

(A) the same(B) twice as great(C) one-half as great (D) four times as great

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

The speedometer in a car does not measure the car’s velocity because velocity is a

(A) vector quantity and has a direction associated with it

(B) vector quantity and does not have a direction associated with it

(C) scalar quantity and has a direction associated with it

(D) scalar quantity and does not have

A projectile launched at an angle of 45° above the horizontal travels through the air. Compared to the projectile’s theoretical path with no air friction, the actual trajectory of the projectile with air friction is

(A) lower and shorter(B) lower and longer (C) higher and shorter(D) higher and longer

Cart A has a mass of 2 kg and speed of 3 m/s. Cart B has a mass of 3 kg and speed of 2 m/s. Compared to the inertia and magnitude of momentum of cart A, cart B has(A) the same inertia and a smaller magnitude

of momentum(B) the same inertia and the same magnitude

of momentum(C) greater inertia and a smaller magnitude of

momentum(D) greater inertia and the same magnitude of

momentum

Approximately how much time does it take light to travel from the Sun to Earth (Sun to Earth distance = 1.5 x 1011 m)?

(A) 2.00 × 10–3 s(B) 1.28 × 100 s (C) 5.00 × 102 s(D) 4.50 × 1019 s

A rock falls from rest a vertical distance of 0.72 meter to the surface of a planet in 0.63 second. The acceleration due to gravity on the planet is

(A) 1.1 m/s2

(B) 2.3 m/s2 (C) 3.6 m/s2

(D) 9.8 m/s2

Two stones, A and B, are thrown horizontally from the top of a cliff. Stone A has an initial speed of 15 meters per second and stone B has an initial speed of 30 meters per second. Compared to the time it takes stone A to reach the ground, the time it takes stone B to reach the ground is

(A) the same (B) twice as great (C) half as great(D) four times as great

The speed of an object undergoing constant acceleration increases from 8.0 m/s to 16.0 m/s in 10 seconds. How far does the object travel during the 10 seconds?

(A) 3.6 × 102 m(B) 1.6 × 102 m (C) 1.2 × 102 m(D) 8.0 × 101 m

A 1200-kg space vehicle travels at 4.8 m/s along the level surface of Mars. If the magnitude of the gravitational field strength on the surface of Mars is 3.7 Newtons per kg, the magnitude of the normal force acting on the vehicle is

(A) 320 N(B) 930 N (C) 4400 N(D) 5800 N

Which diagram represents a box in equilibrium?

The diagram to the right shows an object moves counterclockwise around a horizontal, circular track. Which diagram below represents the direction of both the object’s velocity and the centripetal force acting on the object when it is in the position shown?

An airplane flies with a velocity of 750 km/hour, 30.0° south of east. What isthe magnitude of the eastward component of the plane’s velocity?

(A) 866 km/h (B) 433 km/h(C) 650 km/h (D) 375 km/h

A 1750-kilogram car travels at a constant speed of 15.0 meters per second around a horizontal, circular track with a radius of 45.0 meters. The magnitude of the centripetal force acting on the car is

(A) 5.00 N(B) 583 N (C) 8750 N (D) 3.94 × 105 N

A 0.45-kg football traveling at a speed of 22 m/s is caught by an 84-kg stationary receiver. If the football comes to rest in the receiver’s arms, the magnitude of the impulse imparted to the receiver by the ball is

(1) 1800 N•s(2) 9.9 N•s (3) 4.4 N•s4) 3.8 N•s

A carpenter hits a nail with a hammer. Compared to the magnitude of the force the hammer exerts on the nail, the magnitude of the force the nail exerts on the hammer during contact is

(A) less(B) greater(C) the same

As a meteor moves from a distance of 16 Earth radii to a distance of 2 Earth radii from the center of Earth, the magnitude of the gravitational force between the meteor and Earth becomes

(A) 1/8 as great(B) 4 times as great(C) 8 times as great (D) 64 times as great

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

A car travels at constant speed v up a hill from point A to point B. As the car travels from A to B, its gravitational potential energy(A) increases and its kinetic energy decreases(B) increases and its kinetic energy remains the

same(C) remains the same and its kinetic energy

decreases(D) remains and its kinetic energy remains the

same

What is the maximum amount of work that a 6000-watt motor can do in 10 seconds?

(A) 6.0 × 101 J(B) 6.0 × 102 J (C) 6.0 × 103 J(D) 6.0 × 104 J

The mass of a paper clip is approximately

(A) 1 × 106 kg(B) 1 × 103 kg (C) 1 × 10–3 kg(D) 1 × 10–6 kg

Which diagram best represents the gravitational forces, Fg, between a

satellite, S, and Earth?

A block weighing 10.0 N is on a ramp inclined at 30.0° to the horizontal. A 3.0-Newton force of friction, Ff , acts on the block as it is pulled up the ramp at constant velocity with force F, which is parallel to the ramp. What is the magnitude of force F?

(A) 7.0 N (B) 8.0 N (C) 10. N (D) 13 N

A 25-N horizontal force northward and a 35-N horizontal force southward act concurrently on a 15-kg object on a frictionless surface. What is the magnitude of the object’s acceleration?

(A) 0.67 m/s2 (B) 1.7 m/s2 (C) 2.3 m/s2 (D) 4.0 m/s2

The diagram represents two concurrent forces. Which vector represents the force that will produce equilibrium with these two forces?

Which graph best represents the relationship between the magnitude of the centripetal acceleration and the speed of an object moving in a circle of constant radius?

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

An object is thrown upward. Which pair of graphs best represents the object’s kinetic energy and gravitational potential energy as functions of its displacement while it rises?

An electric drill operating at 120 volts draws a current of 3.00 amperes. What is the total amount of electrical energy used by the drill during 1.00 minute of operation?

(A) 2.16 × 104 J (B) 2.40 × 103 J (C) 3.60 × 102 J (D) 4.00 × 101 J

Which is a vector quantity?

(A) speed(B) work (C) mass(D) displacement

A ball is thrown straight downward with a speed of 0.50 m/s from a height of 4.0 meters. What is the speed of the ball 0.70 second after it is released?

(A) 0.50 m/s (B) 7.4 m/s (C) 9.8 m/s (D) 15 m/s

A soccer player kicks a ball with an initial velocity of 10 m/s at an angle of 30° above the horizontal. The horizontal component of the ball’s initial velocity is

(A) 5.0 m/s (B) 8.7 m/s (C) 9.8 m/s(D) 10 m/s

Which object has the greatest inertia?

(A) a 5.00-kg mass moving at 10.0 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(D) a 20.0-kg mass moving at 1.00 m/s

A 60-kg physics student would weigh 1560 N on the surface of planet X. What is the magnitude of the acceleration due to gravity on the surface of planet X?

(A) 0.038 m/s2

(B) 6.1 m/s2

(C) 9.8 m/s2 (D) 26 m/s2

A 20-N force due north and a 20-N force due east act concurrently on an object. The additional force necessary to bring the object into a state of equilibrium is

(A) 20 N, northeast (B) 20 N, southwest (C) 28 N, northeast(D) 28 N, southwest

A car rounds a horizontal curve of constant radius at a constant speed. Which diagram best representsthe directions of both the car’svelocity, v, and acceleration, a?

A 6.0-kilogram block, sliding to the east across a horizontal, frictionless surface with a momentum of 30 kg•m /s, strikes an obstacle. The obstacle exerts an impulse of 10 N•s to the west on the block. The speed of the block after the collision is

(A) 1.7 m/s (B) 3.3 m/s(C) 5.0 m/s (D) 20. m/s

If a 65-kg astronaut exerts a force with a magnitude of 50 N on a satellite that she is repairing, the magnitude of the force that the satellite exerts on her is

(A) 0 N(B) 50 N less than her weight(C) 50 N more than her weight(D) 50 N

A 1.0-kg laboratory cart moving with a velocity of 0.50 m/s due east collides with and sticks to a similar cart initially at rest. After the collision, the two carts move off together with a velocity of 0.25 m/s due east. The total momentum of this frictionless system is(A) zero before the collision(B) zero after the collision(C) the same before and after the collision(D) greater before the collision than after the

collision

Student A lifts a 50-N box from the floor to a height of 0.40 meter in 2.0 seconds. Student B lifts a 40-N box from the floor to a height of 0.50 meter in 1.0 second. Compared to student A, student B does(A) the same work but develops more power(B) the same work but develops less power(C) more work but develops less power(D) less work but develops more power

While riding a chairlift, a 55-kg skier is raised a vertical distance of 370 meters. What is the total change in the skier’s gravitational potential energy?

(A) 5.4 × 101 J (B) 5.4 × 102 J (C) 2.0 × 104 J(D) 2.0 × 105 J

The work done on a slingshot is 40.0 joules to pull back a 0.10-kg stone. If the slingshot projects the stone straight up in the air, what is the maximum height to which the stone will rise?

(A) 0.41 m(B) 41 m(C) 410 m(D) 4.1 m

A block weighing 40 N is released from rest on an incline 8.0 meters above the horizontal. If 50 joules of heat is generated as the block slides down the incline, the maximum kinetic energy of the block at the bottom of the incline is

(A) 50 J (B) 270 J (C) 320 J (D) 3100 J