00:01
So in this question we are basically looking at the gravitational forces acting between different celestial bodies.
00:10
So we're going to use the general formula which is f for the gravitational force is equal to g times mass of first planet multiplied by mass on the second planet divided by r square where r is the distance between the planets.
00:27
In the first case we are looking at the force between the moon and the sun.
00:35
So we take g multiplied by mass of the moon, by mass of the sun, divided by the distance between the mass and the sun, sorry, the moon and the sun.
00:51
And this distance is about 1 .5 times 10 .11 meters.
01:01
It's around the same distance as between the earth and the sun.
01:05
It's negligible between the moon and the earth.
01:10
Distance compared to the larger scale distance.
01:14
Substitute all the values in.
01:17
So g is the gravitational constant.
01:24
Mass of the moon is given to be 7 .35 times 10 power 22 kilograms.
01:34
Mass of the sun is 1 .99 times 10 power 30 kilograms.
01:40
So we should get a value of 4 .34 times 10 power of 20 newtons...