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Question

Determine the point of application of net force, when forces of 20 N & 30 N are acting on the rod as shown in figure.


A

70 cm from point A

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B

30 cm from D

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C

40 cm from C

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D

60 cm from A

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Solution

The correct option is A

70 cm from point A


Net force acting on the rod Fnet = 10N

Net torque acting on the rod about point C

τC = (20 × 0) + (30 × 20) = 600 N-cm clockwise

Let the point of application be at a distance x from point C

600 = 10 x x = 60 cm

70 cm upwards from A is the point of Application of the net force.


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