uniform plank of weight 20 newton is 200 cm long and rest on a support that is 60 cm from one end. at what distance from that end must an 80N weight be placed in order to balance the plank?
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Answer:
The torque acting on an object is defined as the force acting on an object which makes the object rotate. The magnitude of the torque is given by:
τ
=
r
×
F
where r is the distance between the point of rotation and the force
F
. Note that this is a cross product. Thus, only the component of the force which is perpendicular to the distance r is used in this calculation.
In order for an object to maintain rotational equilibrium, the net torque acting on the object must be zero.
Answer and Explanation: 1
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Given:
{eq}\begin{align*} W_p &= \text{weight of the plank} = 50 \, N \\ \\ W_b &= \text{weight of the boy} = 30 \, N \\ \\ W_e &= \text{weight.
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