g=9.8
G=6.67×10-11
R=8.40×207
M=?
Answer
g=GMr29.8=(6.67×10−11)M(8.4×207)2M=1.327×1022kgg=\frac{GM}{r^2}\\9.8=\frac{(6.67\times10^{-11})M}{(8.4\times20^7)2}\\M=1.327\times10^{22}kgg=r2GM9.8=(8.4×207)2(6.67×10−11)MM=1.327×1022kg
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