1、重力等于万有引力 ,设物体质量为 m
Ga = Gma m/ra² ①
Gb = Gmb m/rb² ②
由 ① ÷ ② 可得 :Ga / Gb = (ma /mb)(rb / ra)² = (5 /4)(2 / 3)² = 5/9
所以 ,Gb = 9/5 Ga = 9/5 × 50 N = 90 N
2、由重力G = mg 可得 :ga / gb = Ga / Gb = 50 / 90 = 5/9
1、重力等于万有引力 ,设物体质量为 m
Ga = Gma m/ra² ①
Gb = Gmb m/rb² ②
由 ① ÷ ② 可得 :Ga / Gb = (ma /mb)(rb / ra)² = (5 /4)(2 / 3)² = 5/9
所以 ,Gb = 9/5 Ga = 9/5 × 50 N = 90 N
2、由重力G = mg 可得 :ga / gb = Ga / Gb = 50 / 90 = 5/9