1. What velocity must a 1340 kg car have in order to have the same momentum as a 2680 kg truck traveling at a velocity of 15 m/s to the west?

2. An object has a mass of 50kg and a weight of 500N when it is resting on the surface of the Earth. If it is moved to a height equal to three times the Earth's radius, what is the object's new weight?

3. A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. At what speed will the second boxcar move?

4. Two football players with mass of 75 kg and 100 kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively. If they grab each other as they collide, what would be the combined speed of the two players just after the collision?

5.

a. A horizontal force of 50.0 N is applied at an angle of 28.50 to a door knob of a 75.0-cm door. What torque is produced to open the door?

b. A door knob is placed in the center of a 75.0-cm door. If a force of 4.45 N is exerted perpendicular to the door at the knob, what torque is produced to open the door?

Part B: [ 5* 1 = 5 pts]

1. When velocity doubles, kinetic energy _____

a. Doubles

b. Triples

c. Quadruples

d. Halves

2. A planet has half the mass of the Earth and half the radius. Compared to its weight on Earth, an apple on this planet would weigh _____.

a. twice as much

b. one-fourth as much

c. half as much

d. the same

e. zero

3. Two objects with masses of M and m, sit r distance apart. What will be the effect on the gravitational force between them if the masses are changed to 8M and 12m?

a. 4F

b. 6F

c. 87F

d. 96F

4. Determine the momentum of a 1000-kg car moving northward at 20 m/s.........

a. 20000 N

b. 20000 J

c. 20000 Kg m/s

d. 20000 Kg m/s north

5. What is the ability to do work

a. Force

b. mass

c. energy

d. velocity