Rotational Motion Question 151

Question: Three masses are placed on the x-axis: 300 g at origin, 500g at x=40cm and 400g atx=70cm . The distance of the centre of mass from the origin is

Options:

A) 40cm

B) 45cm

C) 50cm

D) 30cm

Show Answer

Answer:

Correct Answer: A

Solution:

[a]

Xcm=m1x1+m2x2+m3x3m1+m2+m3

Xcm=300×(0)+500(40)+400×70300+500+400

Xcm=500×40+400×701200=40cm



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