A planet has a mass of 5.97 x 10^24 kg and a radius of 6.38 x 10^6m. Find the weight of a 65.0 kg person at 1000 km above the surface of this planet.
a.
636 N
c.
475 N
b.
678 N
d.
656 N

Question

A planet has a mass of 5.97 x 10^24 kg and a radius of 6.38 x 10^6m. Find the weight of a 65.0 kg person at 1000 km above the surface of this planet.
a.
636 N
c.
475 N
b.
678 N
d.
656 N

anonymous · Answer

Use Newtons Univerisal Law of Gravity

$$F_G = G\frac{mM}{r^2}$$

where m can be the perosn and M is the planet and r is the distance from the center of the planet to the person

anonymous · Answer

i don't know how to use that at all.

anonymous · Answer

Here is a picture:

|dw:1383704810337:dw|

that is suppose to be a 1000 km not m?

G = 6.67384 x 10^-11 N (m/kg)^2

anonymous · Answer

You are basically finding how much force the planet will pull on the person 

which is also how much the person pulls on the planet

anonymous · Answer

OH!!!!