PHYSICS HELP !! 30 points any help is greatly appreciated Planet X has DOUBLE the MASS of Earth and has a radius that is DOUBLE the Earth’s radius. The acceleration due to gravity on the surface of Planet X must be .

HINT: Use Rule of Ones (proportions) with Newton's Law of Gravitation.

options:

2g

4g

g/2

g

Alula and Eduardo weigh the same on Earth. If Alula goes to the Moon, how will his MASS compare to Eduardo’s?

options:

Alula’s mass will be smaller than Eduardo’s because the mass of the Moon is much less than Earth’s.

Alula will have greater mass than Eduardo because the radius of the Moon is much smaller than Earth’s. Therefore, he is much closer to the center of mass.

Since the effect of gravity is much less on the Moon, Alula’s mass will be smaller than Eduardo’s.

Their masses will be the SAME since mass is independent of gravity.

The force of gravitational attraction between any two particles in the universe is directly proportional to .

the distance between their centers.

the square of the distance between their centers.

the sum of their masses.

the product of their masses.

Suppose an airplane traveling in a circle at 142 m/s can turn in a circle with as much as 60.8 m/s² of centripetal acceleration. How big will the radius of this circle be?
options:

1230000 m

2.34 m

8628 m

332 m