25.A planet has mass one-half the mass of the earth. What radius must it have so that the
acceleration due to gravity at its surface is the same as the acceleration due to gravity at the
surface of the earth? (Answers are expressed in terms of the radius of the earth.)
(A) R = 1.41 RE (B) R = 0.71 RE (C) R = 2.00 RE (D) R = 0.50 RE
寫作批改
VIP與詳解卡管理
私人筆記( 0 )