A 490 kg satellite orbits at a distance from the Earth's center of about 5.7 Earth radii. What gravitational force does the Earth exert on the satellite? _____ N

The planet Mars has a radius of about 0.53 Earth radii and a mass of only 0.11 Earth masses. Estimate g on Mars. _______ m/s²

A satellite orbits at a height of 850 km above the Earth's surface. a. What is the acceleration due to gravity at this height? ___ m/s b. What is the orbital velocity at this height? ___ m/s c. What is the period of the orbit? ___ minutes Use G = 6.67e-11, mass of earth = 6e+24 kg, and radius of earth = 6400000

A small moon orbits a planet (not the Earth!) once every 430 minutes. If the radius of the orbit is 9200 km, what is a. the orbital speed? ___ m/s b. the centripetal acceleration? ___ m/s c. the mass of the planet the moon orbits? ___ kg Use G = 6.67e-11

Two identical boxcars (m = 15698 kg) are traveling along the same track but in opposite directions. Both boxcars have a speed of 8 m/s. If the cars collide and couple together, what will be the final speed of the pair? ____ m/s

What is the momentum of a 1060 kg sports car traveling down the road at a speed of 34 m/s? _____ kgm/s

How fast would you have to throw a baseball (m = 145 g) to give it the same momentum as a 9 g bullet traveling at 870 m/s? ____ m/s

What average net force is needed to accelerate a 1500 kg car to a speed of 30 m/s in a time of 7 s? ________ N

What impulse is needed to stop a 1800 kg car traveling at 19 m/s? ______ Ns

A soft rubber ball (m = 0.8 kg) is falling vertically at 8 m/s just before it hits the ground and stops. What is the magnitude of the impulse acting on the ball? Ns If the ball had bounced instead, would the impulse be less than, equal to, or greater than what you calculated?

less than

equal to

greater than

A 1500 kg car has a speed of 29 m/s. If it takes 7 s to stop the car, what is the impulse and the average force acting on the car?

impulse	Ns
average force	N

A coach is hitting pop flies to the outfielders. If the baseball (mass = 145 g) stays in contact with the bat for 0.04 s and leaves the bat with a speed of 62 m/s, what is the average force acting on the ball? ____ N

A very hard rubber ball (m = 0.6 kg) is falling vertically at 5 m/s just before it bounces on the floor. The ball rebounds back at essentially the same speed. If the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball? ___ N

A father (m = 66 kg) and son (m = 32 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3 m/s after they have separated. How fast will the father be moving? ____ m/s

A woman with a mass of 48 kg runs at a speed of 6 m/s and jumps onto a giant 30 kg skateboard initially at rest. What is the combined speed of the woman and the skateboard? _____ m/s

A 3 kg ball traveling to the right with a speed of 3 m/s collides with a 3 kg ball traveling to the left with a speed of 3 m/s. What is the total momentum of the two balls before and after the collision? Take right to be the positive direction.

before collision	kgm/s
after collision	kgm/s

A boxcar traveling at 12 m/s approaches a string of 6 identical boxcars sitting stationary on the track. The moving boxcar collides and links with the stationary cars and they all move off together along the track. What is the final speed of the cars immediately after the collision? (You may take the mass of each boxcar to be 18,537 kg.) ____ m/s

A 2 kg ball moving 31 m/s hits a 8 kg ball in a head on collision. If the 8 kg ball was initially at rest and has a velocity of 12 m/s after the collision, what is the velocity of the 2 kg ball after the collision? Enter a negative number if the ball changes direction. ____ m/s

What is the kinetic energy of a 1450 kg sports car traveling down the road with a speed of 28 m/s? ___ J

A 3 kg toy car with a speed of 8 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 1 m/s. If the cars are locked together after the collision with a speed of 4.40 m/s, a. What is the momentum before and after the collision? before: ____ kg m/s after: ____kg m/s b. What is the kinetic energy before and after the collision? before: ___J after: ____J

A 0.5 kg air-hockey puck is initially at rest. What will its kinetic energy be after a net force of 0.6 N acts on it for a distance of 1.0 m? ____ J

A 15 N block lifted straight upward by a hand applying a force of 15 N has an initial kinetic energy of 8 J. If the block is lifted 5 m, how much work does the hand do? ____ J What is the block's final kinetic energy? ___ J

A radio-controlled car increases its kinetic energy from 5 J to 10 J over a distance of 4 m. What was the average net force on the car during this interval? ____ N

A toy car has a kinetic energy of 8 J. What is its kinetic energy after a frictional force of 0.5 N has acted on it for 4 m? ___ J

A woman with a mass of 55 kg climbs a set of stairs that are h = 6 m high. How much gravitational potential energy does she gain? _____ J

h Vbi bo A VAb