129=k/3978^2

Question

the weight of an object on or above the surface of earth varies inversely as the square of the distance between the object and the earths center. At Sea level (3978 mi from the center of earth), an astronaut weighs 129 lbs. Find her weight when she is 191 mi above the surface of the earth and the spacecraft is in not motion.

Answer 1

radius for spheer with erth's volume=3,963.253 miles

add  191 miles & rad=4154.253 mile

4154.253/3,963.253=1.048192735

squared=1.098708

1/square=0.9101599

or wate=  129 pounds/1.098708

=117.411 pounds