A uniform rod PQ of length 1m and mass 2kg is pivoted at the end p. If load of 14N is placed at the center of the rod, find the force that should be applied vertically upwards at Q to maintain the rod at equilibrium horizontally [g = 10ms-2]
a
68N
b
28N
c
17N
d
7N
Explanation
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Discussions (11)

Brinsage23
5 years ago
Since the rod is 2kg (20N) and a load of 14N is place at the centre. The total load on the centre of the rod will be 34N (20N + 14N = 34N)
According to the principle of moment:
Clockwise moment = Anticlockwise moment
34(0.5)= F × 1
17N = F
F = 17N

Daniel Brainy
9 years ago
At equilibrum,
upward moment is equal to downward moment. The force to be applied vertically upward multiplied by its distance from d pivot 1m is equal to product of the sum of the rod weight 20 N and the force at d centre 14N and their common distance 0.5m from d pivot.






