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G planet = 2 x G bumi
m bumiplanet = 1.200 kg
g bumi = 10 m/s²
dit : m dan W di planet ?
dijwab :
mplanet x g planet = m bumi x g bumi
m planet x 2(10) = 1.200 x 10
m planet x 20 = 12.000
m planet = 12.000/20
m planet = 600 kg
W planet = m planet x g planet
= 600 x 2 (10)
= 600 x 20
= 12.000 N
nomor 5 :
dik :
m = 1.200 kg
v = 6 km/jam
t = 10 s
dit : F ?
dijwab :
Vt = (6x1000)/3.600
= 1,667 m/s
a = (Vt-V0)/t
= (1,667-0)/10
= 0,167 m/s²
F = m x a
= 1,200 x 0,167
= 200 N