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March 29, 2015

Homework Help: Physic (concepts-please check my thoughts)

Posted by Diane on Sunday, December 10, 2006 at 6:16pm.

A net torque applied to a rigid object always tends to produce?
a)translational acceleration
b) rotational equilibrium
c) rotational acceleration
d) rotational inertia
e) none of these

work (c)
Torque produces torsion and tends to produce rotation. The net torque acting on a body is always equal to the product of the body's moment of inertia about its axis of rotation and its observed angular acceleration. If a body undergoes no angular aceleration, there is no net torque acting on it.

The conditions that the net force and the net torque vanish:
a) hold for every rigid body in equilibrium
b) hold only for elastic solid bodies in equilibrium
c) hold for every solid body
d) are always sufficient to calculate the forces on a solid object in equilibrium
e) are sufficient to calculate the forces on a solid object in equilibrium only if the object is elastic.

work (a)
i believed the answer was a because a rigid body is connected and all its parts move as a whole. So for a rigid body there is no net torque or no net force. Everything should balance. I believe that is why in equilibrium problems they use Uniform.

Thank you

You are right on the first, and have chosen the best answer on the second. THe second question begs for rewording.

ok so the answers I choose both look good

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