Law of Universal Gravitation

According to the geocentric theory, _______ is the center of the solar system?

• Earth

• Sun

• Moon

• Venus

Who determined the value of the gravitational constant, G?

• Isaac Newton

• Johannes Kepler

• Henry Cavendish

• Tycho Brahe

Kepler's 3rd Law of Planetary Motion is also known as _____

• Law of Orbits

• Law of Areas

• Law of Universal Gravitation

• Law of Periods

What is the Universal law of gravitation equation?

• G=F ⋅ m₁⋅m2/r²

• F=G ⋅ r²/m₁⋅m₂

• F=G ⋅ m₁⋅m₂/(r)²

• G=F ⋅ r²/m₁⋅m₂

Two objects are attracted to each other with 36 N of gravitational force. What would the force between them be if the distance between them were doubled?

• 9

• 18

• 72

• 144

What is the gravitational force between two identical 50,000 kg asteroids whose centers of mass are separated by 1000 m?

• 2500 N

• 1.67 x 10^-4 N

• 1.67 x 10^-4 N

• 1.67 x 10^-7 N

If the original force of gravity is 1,800 N and the distance is tripled then the force of gravity is

• 900

• 200

• 600

• 5400

What is true about the area between points A, B and the Sun, and the area between points H, I and the Sun?

• The area between A, B and the Sun is the largest.

• Both areas are equal in size

• The area between H, I and the Sun is the largest

• There is not enough information to determine the areas

Planet A of mass 2M_p orbits Star A of mass M_s in a circular orbit of radius R, what is the magnitude of the gravitational force of Planet A?

• F_g = GM_pM_s/R²

• F_g = R²/GM_pM_s

• F_g =2GM_pM_s/R²

• F_g = R²/2GM_pM_s

A newly discovered planet has twice the mass and 3 times the radius of the Earth. What is the free fall acceleration, at its surface, in terms of g at the surface of the Earth?

• 2/9g

• 2/3g

• 3/4g

• 4/3g