Question

A uniform rod 3m long is pivoted at its mid point and used as see saw. Jean who weighs 400N sits on one end. Where must john who weighs 600N sit if see saw is to balance
A.1.5
B.1.3
C.1
D.0.5
Tell me with solution

Answer 1

Hola User______________

Here is Your Answer.....!!!!
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Actually welcome to the concept of the Moment of force or Torque .....

after solving we get this ....

Answer 2

Length of rod= 3m
mid point = 1.5m

When a body is in equilibrium, the resultant force on it is zero and the sum of the clockwise moments about a point is equal to the sum of the anticlockwise moments about the same point.

So,
Clockwise moment = Anticlockwise moment.

Now, Anticlockwise moment = 400N x 1.5m
= 600Nm

So clockwise moment should be 600 Nm too.

Hence, Clockwise moment = 600 Nm
= 600N x dist. = 600 Nm
= dist. = 1m

so, correct ans will be (c)