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Gravitational and Electric Forces

AP Physics 1· difficulty 2/5

The acceleration due to Earth's gravity at altitude hh above the surface (Earth radius RER_E) is

  • A

    gE (RE/(RE+h))2g_E\,(R_E/(R_E + h))^2

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  • B

    gEg_E

  • C

    gE RE/(RE+h)g_E \, R_E/(R_E + h)

  • D

    gE (h/RE)2g_E\,(h/R_E)^2

Explanation

From g=GM/r2g = G M/r^2 with r=RE+hr = R_E + h: g(h)=gE (RE/(RE+h))2g(h) = g_E\,(R_E/(R_E + h))^2.

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