Question 1 (2 points)
What is gravitation?
Question 1 options:

the tendency of objects to move downward

the attraction of any two objects because of their mass

the attraction or repulsion of objects because of their electric charge

the effect of air pressure in pushing objects to the ground
Question 2 (2 points)
Which of these was discovered by Newton?
Question 2 options:

The acceleration caused by gravity is�9.8�m/s/s.

Gravity keeps the planets in their orbits.

The planets move in elliptical orbits around the sun.

The earth orbits the sun, rather than the reverse.
Question 3 (2 points)
How was the gravitational constant�G�first determined?
Question 3 options:

by measuring the force of gravity between two planets

by observing the moon's orbit

by measuring the force of gravity between two objects on the earth

by knowing that the acceleration caused by gravity is�9.8�m/s/s
Question 4 (2 points)
The force of gravity between any two ordinary objects on the earth is __________.
Question 4 options:

always downward

stronger when closer to the earth

stronger if the objects are more massive

stronger than the force of gravity from the earth
Question 5 (2 points)
Which of these statements is true about the International Space Station in orbit around the earth?
Question 5 options:

The space station exerts a force on the earth toward the space station.

The earth's gravity acts on the space station, but not the reverse.

There is no gravity acting at the height of the space station.

The force of gravity produces the same acceleration for the earth and the space station.
Question 6 (2 points)
Suppose a planet has twice the mass of the Earth and twice the earth's radius. What is the acceleration of an object in free fall on this planet?
Question 6 options:

twice as much as on Earth.

four times as much on Earth.

one half as much as Earth.

one fourth as much as Earth.
Question 7 (2 points)
Which of these does Newton's law of universal gravitation imply?
Question 7 options:

Force is mass times acceleration squared.

There is no gravity inside a space station in orbit.

The earth attracts the moon more strongly than the moon attracts the earth.

The force of the earth's gravity on an object at sea level is stronger than at the top of a mountain.
Question 8 (2 points)
What is a gravitational field?
Question 8 options:

a region of space-time with constant gravity

the region of space-time where the force is equal to�6.67�10?11�N

a region of space-time with a property at each point determined as the gravitational force on any object divided by its mass�m

the force of gravity between any two objects
Question 9 (2 points)
A gravitational field can be represented by
Question 9 options:

field vector arrows pointing in the direction of the gravitational force.

field vector arrows pointing in the direction of the electrical force.

a photo of a large, green field filled with heavy grass.

field vector arrows pointing in random directions based on their mass.
Question 10 (2 points)
What is the magnitude of a gravitational field at a location where an 80 kg astronaut weighs 25 percent what he would weigh on the earth?
Question 10 options:

10 N/kg

2.5 N/kg

20 N/kg

200 N/kg
Question 11 (2 points)
What causes gravitational force in Einstein's theory of general relativity?
Question 11 options:

the way an object with mass placed on a surface bends the surface

the way mass bends space and time

the existence of black holes

reference frames moving at a constant relative velocity
Question 12 (2 points)
A mass of 10.0 kg is in a gravitational field of�3.50�N/kg�. What force acts on the mass?
Question 12 options:

0.35 N

9.8 N

35.0 N

21.6 N

It was originally measured by Cavendish in 1978, he actually measured Earths density, and by knowing that the acceleration was roughly 9.8m/s^2, he could estimate the constant, so here the correct option is:

"by knowing that the acceleration caused by gravity is 9.8 m/s/s"

The fourth question is: The force of gravity between any two ordinary objects on the earth is?

Remember, gravity is an attractive force that depends on the mass of the objects. Here the only option that is always correct is:

"stronger if the objects are more massive"Question 5:Here the correct option is:"

For question 5 we have that the correct one is:

"The space station exerts a force on the earth toward the space station" Gravity acts on both objects, the earth and space station, just that the planet has a lot more mass than the space station, thus the force that it causes in the planet is negligible.

Question 6:

Gravity increases linearly with mass and decreases quadratically with distance, so if we double the mass and the radius, we can expect that the gravity at the surface to be near half of that one we have on Earth, then the correct option is:

"one half as much as Earth."

Question 7:

Again, force decreases with distance squared, then if you are closer to the planet, let's say, at sea level, the force will be greater than if you are on top of a mountain. The correct option is:

"The force of the earth's gravity on an object at sea level is stronger than at the top of a mountain."

Question 8.

By definition of gravitational field, the correct option is the last one:

"a region of space-time with a property at each point determined as the gravitational force on any object divided by its mass"

Question 9:

The field defines the force, thus the arrows should point in the same direction that the force acts, the correct option is:

"field vector arrows pointing in the direction of the gravitational force."

Question 10:

The correct option is 2.5 N/kg

Notice that N/kg = m/s^2

To get this, you just need to compute the 25% of Earth's gravitational acceleration.

Question 11:

The correct option is:

"the way an object with mass placed on a surface bends the surface"

Gravity is thought as a deformation in the space plane.

Question 12:

We just multiply the mass by the field:

10kg*3.5 N/kg = 35N

If you want to learn more, you can read:

https://brainly.com/question/21454806