Jawaban:

1.  

r = 3 m sesuai di gambar, di soal 2 m

F = G m1m2 / r^2

F = G 3 9 / 3^2

F = 3 G

F = 3 6,67x10^-11 = 20x10^-11 N

2.

W = mg

50 = m 10

m = 50/10 = 5 kg

g planet / g bumi = (G M/r^2)p  /  (G  M/r^2)b

gP / gB = 5 mB/ (2rB)^2 / mB/rB^2

gp / gB = 5/4

gp = 5/4  10 = 12,5 m/s^2

W di planet = mg = 5 * 12,5 = 62,5 N

3.  kg m/s^2 = M L/T^2

4.

r dari pusat bumi = R + 2R = 3R

g di orbit / g di muka bumi = (G M/r^2)o / (G M/r^2)b

gO / gB = G M/(3R)^2 / GM/R^2

gO/gB = 1/9

gO = 1/9 gB = 1/9 10 = 1,11 m/s^2

5.

( Tp/Tq ) ^2 = (rp/rq) ^3

(1/27) ^2 = (3/rq) ^3

1/9 = 3/rq

rq = 3*9 = 27 SA

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