(a) The weight of a person varies inversely as the square of its distance from the center of the Earth. If a person weighs 210 pounds on the surface of the earth (r = 4000 miles) how much will he weigh at 1000 miles above the Earth's surface?

Question

(a)	 The weight of a person varies inversely as the square of its distance from the center of the Earth. If a person weighs 210 pounds on the surface of the earth (r = 4000 miles) how much will he weigh at 1000 miles above the Earth's surface?

anonymous · Answer

@demonchild99 @dan815 @shrutipande9 @misty1212 @mathmate @Angelus

anonymous · Answer

@iGreen. @henrry123

anonymous · Answer

nevermind, i got it:

4000 Miles/ 1000 miles= 4
210/4 = 52.2pounds
That person would weigh 52.5 pounds

anonymous · Answer

(b)   You can build a snow fort in 6 hours. If your sister helps you, it will only take 4 hours working side-by-side.  How long would it take for your sister to build the snow fort by herself?

mathmate · Answer

@radelp
" The weight of a person varies $inversely$ as the square of its distance from the $center$ of the Earth."
You may want to make adjustments to your solution.
1000 km above surface of the earth is 5000 km from the $centre$ of the earth.
I'll leave it to you to adjust the $varies~inversely$ part.