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0 votes
52.2k views
in Physics by (70.7k points)

Two objects, of masses 6 and 8 kilograms, are hung from the ends of a stick that is 70cm long and has marks every 10 cm, as shown. If the mass of the stick is negligible, at which of the points indicated should a cord be attached if the stick is to remain horizontal when suspended from the cord? 

(A) A 

(B) B 

(C) C 

(D) D 

(E) E

1 Answer

+1 vote
by (65.1k points)
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Best answer

Correct option (D) D

To balance the torques on each side, we obviously need to be closer to the heavier mass. 

Trying point D as a pivot point we have: 

(m1g) • r1 ? = ? (m2g) • r2 

(6kg) (40cm) ? = ? (8kg) (30 cm) and we see it works.

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