Calculate the work (in joule) that must be done on a mass to lift it from Earth’s…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Calculate the work (in joule) that must be done on a

2\,\text{kg}

mass to lift it from Earth’s surface to a height equal to Earth’s radius

R_{\oplus}

. (Take

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

and

R_{\oplus}=6.4\times10^{6}\,\text{m}

.) (a)

1.3\times10^{8}\,\text{J}

(b)

6.3\times10^{7}\,\text{J}

(c)

-6.3\times10^{7}\,\text{J}

(d)

3.1\times10^{7}\,\text{J}