Physics

Problem

A planet of radius

R = \frac{1}{10} \times (\text{radius of Earth})

has the same mass density as Earth. Scientists dig a well of depth

\frac{R}{5}

on it and lower a wire of the same length and a linear mass density

10^{-3} \text{ kg m}^{-1}

into it. If the wire is not touching anywhere, the force applied at the top of the wire by a person holding it in place is (take the radius of Earth =

6 \times 10^6 \text{ m}

and the acceleration due to gravity on Earth is

10 \text{ ms}^{-2}

) a. 96 N b. 108 N c. 120 N d. 150 N

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