Question

what are the conditions for an object to be in static equilibrium?
a the net force acting on the object and the sum of the torque is zero.
b the net force acting on the object and the sum of the torque is non - zero.
c the net force acting on the object is non - zero; the sum of the torque is zero.
d the net force acting on the object is zero; the sum of the torque is non - zero.

Explanation:

Static equilibrium in physics (a subfield of Natural Science) requires two conditions: the net force on the object must be zero (so there's no translational acceleration) and the sum of torques must be zero (so there's no rotational acceleration). Option A states both the net force is zero and the sum of torque is zero, which matches these conditions. Option C and D have non - zero net force or torque, and Option B has non - zero torque, so they don't satisfy static equilibrium.

Answer:

A. The net force acting on the object and the sum of the torque is zero.