. A 4 m long rod of negligible weight is to be balanced about a point 125


A 4 m long rod of negligible weight is to be balanced about a point 125 cm from one end and A load of 18 kgf is suspended at a point 60 cm from the support on the shorter arm.

(a) If a weight W is placed at a distance of 250 cm from the support on the longer arm, Find W.

(b) If a weight 5 kgf is kept to balance the rod, find its position.
(c) To which class of lever does it belong?

 

 

Best Answer

Total length of rod = 4 m = 400 cm

(a) 18 kgf load is placed at 60 cm from the support.

W kgf weight is placed at 250 cm from the support.

By the principle of moments

18 x 60 = W x 250

W = 4.32 kgf

(b) Given W=5 kgf

18 kgf load is placed at 60 cm from the support.

Let 5 kgf of weight is placed at d cm from the support.

By the principle of moments

18 x 60 = 5 x d

d = 216 cm from the support on the longer arm

(c) It belongs to class I lever.

 

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