Please answer ALL questions.

1. The gravitational force between two objects is. Check all that apply.

a. inversely proportional to the square of the distance between the objects.

b. directly proportional to the square of the distance between the objects.

c. inversely proportional to the masses of the objects.

d. directly proportional to the masses of the objects.

2. The value of the Earth's gravitational acceleration is:

a. the smallest at the sea level

b. the smallest at the top of a high mountain.

c. the smallest at the bottom of the ocean.

d. constant everywhere on the Earth.

3. The acceleration due to gravity on the Moon is 1/6 of the acceleration on the Earth. What will be the mass of the object on the surface of the Moon, if its mass is 60 kg on the surface of the Earth?

a. 60 N

b. 60 kg

c. 10 kg

d. 10 N

4. The acceleration due to gravity on the Moon is 1/6 of the acceleration on the Earth. What is the weight of an object on the Earth's surface if itweighs 60 N on the Moon's surface?

a. 10 kg

b. 60 kg

c. 360 N

d. 10 N

5. Rocket propulsion is based on Newton's ["Second Law", "First Law", "Law of Gravity", "Third Law"] , which says that for every force, there is ["an acceleration due to gravity", "an object moving with constant velocity", "an acceleration in the same direction as the force", "an equal and opposite force of reaction"].

Watch this video to answer questions 6 and 7: https://www.youtube.com/watch?v=L0AMQ6kRNMA

6. Rockets are able to lift off and travel because of

a. their speed with respect to the ground

b. their velocity with respect to the ground

c. the thrust provided by the engine

d. their push of the ground against the gravity

7. What is the main advantage of a multistage rocket?

a. The total weight of the rocket is greatly reduced as the rocket rises.

b. Much less air pollution.

c. The cost of producing it.

8. A rocket pushes the fuel down. What is the other force in this interaction pair?

a. The rocket pulls the earth up.

b. The earth pulls the rocket down.

c. The fuel pushes the rocket up.

d. The fuel pulls the rocket up.

9. An unbalanced force that is appliedat the center of mass of an object will

a. cause the object to spin in the direction of the force.

b. make aCCW torque on the object.

c. not make any torque on the object.

d. make aCW torque on the object.

10. The arrows in the figure below represent forces applied to six identical wrenches. All red vectors have the same magnitude. The magnitude of the blue vector is greater than that of the red. Which wrench experiences the most and which the least torque?

\fA B Craftsman 15 mm C Craftsman 15 mm O C D Craftsman 15 mm Craftsman 15 mm O E F Craftsman 15 mm Craftsman 15 mm O