A woman who normally weighs 400 N stands on top of a very tall ladder so she is one Earth-radius above Earth's surface. What is her weigh there?
A)zero
B)100 N
C)200 N
D)400 N
E)none of the above

Question

Quizplus · Accepted Answer

At a height equal to the radius of the Earth, the gravitational force acting on an object is one-fourth of the force acting on it when it is on the surface of the Earth. Therefore, her weight on top of the ladder will be one-fourth of her weight on the surface of the Earth.

Weight on top of the ladder = (1/4) x 400 N = 100 N

Hence, the correct option is B) 100 N.

A Woman Who Normally Weighs 400 N Stands on Top