- #1

- 2

- 0

Find the point where the gravitational force from the earth is 2 times of that from moon.

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter crystal5428
- Start date

- #1

- 2

- 0

Find the point where the gravitational force from the earth is 2 times of that from moon.

- #2

Andrew Mason

Science Advisor

Homework Helper

- 7,662

- 385

What is the force of gravity at a point Re from the centre of the earth? What is the force of gravity at a point Rm from the centre of the moon? What is Rm at a point on a line between the centres of the earth and moon that is Re from the centre of the earth?

Find the point where the gravitational force from the earth is 2 times of that from moon.

AM

- #3

- 2

- 0

mass of earth=5.98*10(to the power of 24)

mass of moon=7.35*10(to the power of 22)

radius of earth and moon=3.84*10(to the power of 8)

- #4

Andrew Mason

Science Advisor

Homework Helper

- 7,662

- 385

The distance between the centres of the earth and moon is 3.84 x 10^8 m or 3.84 x 10^5 km.

mass of earth=5.98*10(to the power of 24)

mass of moon=7.35*10(to the power of 22)

radius of earth and moon=3.84*10(to the power of 8)

Just use Newton's law of universal gravitation to express the force of gravity from the earth at a distance R from the centre of the earth (R>radius of the earth). Same for the moon. Then set the force of gravity of the earth equal to twice the force of gravity of the moon.

AM

Share: