1. If a bowling ball has a mass of 8 kg and is thrown with a velocity of 5.65 m/s, what is the momentum of the bowling ball?

Question

a. 45.2 kgm/s**
b. 54.8 kgm/s
c. 38.75 kgm/s
d. 40.1 kgm/s

2. What is the difference between momentum and force?
a. Momentum is calculated, while force can only be measured
b. Momentum is a measurement that is not a vector value, while force has to be a vector value
c. Momentum is not related to to the velocity of an object, while force is directly responsible for changing the velocity of an object
d. Momentum is a description of the motion of an object, while forces are outside phenomena that act upon the object**

3. Which of the following would be an example of a closed system?
a. A person pushing a refrigerator box across a rough floor**
b. A water bucket being pulled up by rope from a well
c. A rolling oil drum across a smooth, frictionless marble floor
d. A large moving rock slowing down while ploughing through loose sand

4. Two objects are rolling towards one another. Object 1 has a mass of 10 kg and a velocity of 1.2 m/s. Object 2 has a mass of 5 kg and a velocity of -2.2 m/s. What is the total amount of momentum these objects must have after they collide?
a. 10 kgm/s
b. 100 kgm/s
c. 0.1 kgm/s
d. 1 kgm/s**

5. If a football quarterback runs into and tackles another player by grabbing onto them, what type of collision would this technically be?
a. elastic
b. inelastic**

6. If your actual mechanical advantage is 70 J, and the theoretical is 100 J, what is your percent efficiency?
70% was my answer.

7. In machines with low efficiency, most of the lost energy is turned into
a. Light
b. Sound
c. Power
d. Heat**

8. In the real world, machines never lose energy outside of the work the machines are trying to do.
a. True
b. False**

9. In an inelastic collision, momentum is still conserved, but energy is not.
a. True**
b. False

can anyone help me out here?