Jawaban:

Perbandingan berat benda di bumi dan di suatu planet

Wb = m x gb

Wp = m × gp

dimana :

Wb = berat benda di permukaan bumi

Wp = berat benda di permukaan planet

m = massa benda

gb = percepatan gravitasi di permukaan bumi

= GMb/rb^2

gp = percepatan gravitasi dipermukaan planet

= GMp/rp^2

Jadi perbandingan berat benda di permukaan bumi dan planet dirumuskan:

Wb/Wp = gb/gp (karena massa benda tetap)

= (Mb/Mp) x (rp/rb)^2

Data soal :

Mx = 8 Mb

rx = 5 rb

Wb = 250 N

Wb/Wp = (Mb/Mp) x (rp/rb)^2

= (Mb/8Mb) x (5 rb/rb)^2

250/Wp = 1/8× 25

Wp = 80 N