Physics

Problem

A miner of mass

50\,\text{kg}

is working at a depth of

800\,\text{km}

below Earth’s surface. Taking

g = 9.8\,\text{m\,s}^{-2}

at the surface and Earth’s radius

R = 6400\,\text{km}

, the miner’s weight at that depth is closest to a)

5.5 \times 10^{2}\,\text{N}

4.9 \times 10^{2}\,\text{N}

4.3 \times 10^{2}\,\text{N}

6.4 \times 10^{2}\,\text{N}