Gravitational field

The Earth may be assumed to be spherical with radius r and density p.

Which equation correctly relates the gravitational field strength g at its surface to these quantities and

the gravitational constant G?

• g=G/ r²

• g=3 G \ 4 π r p

• g= G 4 π r p \ 3

• g= G 4 π r² p \ 3

In this equation...

• G is the gravitational field strength
• r is the distance between the 2 masses
• F is the repulsive gravitational force
• m is the momentum of the mass

Tags

NGSS.HS-PS2-4

Kepler's third law states that....

• An imaginary line drawn from the center of the sun to the center of the planet will sweep out equal areas in equal intervals of time. (The Law of Equal Areas)
• The path of the planets about the sun is elliptical in shape, with the center of the sun being located at one focus. (The Law of Ellipses)
• The ratio of the squares of the periods of any two planets is equal to the ratio of the cubes of their average distances from the sun. (The Law of Harmonies)

The minimum velocity required to leave the atmosphere is called the...

• orbital velocity
• ejection velocity
• terminal velocity
• escape velocity

The time it takes a comet to complete one revolution is called the

• focus

• period

• orbit

• ellipse

According to Kepler's laws, the paths of the planets are

• ellipses

• Earth-centered

• circles

• parabolas

It takes Pluto a longer time to orbit the sun than the Earth does because Pluto

• has much further to go

• goes much slower

• travels in an elliptical pattern

• all of the above

At which lettered position does the planet have the greatest speed?

• A

• B

• C

• D

• E

Which of the following is needed to calculate escape speed for a rocket from earth?

• mass of fuel used in the rocket
• mass of the rocket
• mass of Earth
• all of the above

Tags

NGSS.HS-PS2-4

Gravitational field strength is measured in:

• N
• J/kg
• m/s
• N/kg

Tags

NGSS.HS-PS2-4