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Gravitational and Electric Forces

AP Physics 1· difficulty 4/5

R, M 2R, 4M

Planet Q has mass 4M4M and radius 2R2R, while planet P has mass MM and radius RR. What is the ratio gQ/gPg_Q/g_P of surface gravities?

  • A

    22

  • B

    12\tfrac{1}{2}

  • C

    11

    check_circle
  • D

    44

Explanation

g=GM/R2g = GM/R^2. Ratio: (4M)/(2R)2÷M/R2=4/4=1(4M)/(2R)^2 \div M/R^2 = 4/4 = 1.

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