A research balloon rises to an altitude of above the Earth’s surface

PHYSICS · Single correct · AP · Physics C: Mechanics · Force and Translational Dynamics · Force and Translational Dynamics

Problem

A research balloon rises to an altitude of

160\,\text{km}

above the Earth’s surface. Taking Earth’s radius

R = 6400\,\text{km}

, the percentage decrease in the value of

g

at that altitude is closest to (a)

2.5\%

(b)

7\%

(c)

3\%

(d)

5\%