Physics

Problem

A space-elevator cabin has reached a height of

640\,\text{km}

above Earth’s surface and is accelerating upward at

2\,\text{m\,s}^{-2}

. Taking

R = 6.4\times10^{6}\,\text{m}

and

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

at the surface, what is the reading of a weighing machine for an astronaut of mass

60\,\text{kg}

inside the cabin? a)

708\,\text{N}

600\,\text{N}

486\,\text{N}

468\,\text{N}