Question 650148
The weight, W, of an object varies inversely as the square of the distance, d, from the center of the earth. At sea level (3978 mi from the center of the earth), an astronaut weighs 220 lb. Find their weight when they are orbiting 400 mi above sea level. 
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W = k/r^2
220 = k/3978^2
You can solve for k, but it's not necessary.
{{{220*3978^2 = W*(3978 + 400)^2}}}
W = 181.64 pounds