00:01
So we have an object of mass 6 .4 kilograms, and it is placed on earth, which has a mass of 5 .98 times 10 to the 24th kilograms, and the radius of earth is about 6 .37 million meters.
00:22
And so we want to calculate the gravitational force between this object and earth.
00:28
So the force is going to be newton's gravitational constant times the mass of earth, times the mass of our object, divided by the radius of earth squared.
00:38
And so this is like 6 .67 times 10 to the negative 11 cubic meters per kilogram per second squared times 5 .98 times 10 to the 24 kilograms times 6 .4 kilograms divided by, 6 .37 times 10 to the 6 meters.
01:04
And so if we plug all those numbers in, you should get something, let's see, double check, 6 .67 times into the negative 11th times 5 .98 times 24th, times 6 .4 divided by 6 .37 times the 6th.
01:27
Yeah, something like 62 .91 newtons.
01:34
So that's the first question.
01:35
The next question says, basically do the same calculation, but now calculate the magnitude of the gravitational force between the moon and an object on the surface of earth nearest the moon...