# physics- torque

posted by
**Anonymous**
.

1. Find the magnitude of the torque produced by a 3.0 N force applied to a door at a perpendicular distance of 0.25 m from the hinge.

2. A simple pendulum consists of a 3.0 kg point mass hanging at the end of a 2.0 m long light string that is connected to a pivot point.

a. Calculate the magnitude of the torque (due to the force of gravity) around this pivot point when the string makes a 5.0 degree angle with the vertical.

b. Repeat the calculation for an angle of 15 degrees.

3. If the torque required to loosen a nut on the wheel of a car has a magnitude of a 40.0 N*m, what minimum force must be exerted by a mechanic at the end of a 30.0 cm wrench to loosen the nut?

We do not do homework for you here; we try to help you do it yourself.

These problems are not difficult. I suggest you first read in your textbook or the following web page what the meaning of "torque" is.

http://www.physics.uoguelph.ca/tutorials/torque/Q.torque.intro.html

There is a picture at that website that should help you figure out how to do these problems

Make an attempt to answer at least some of the questions. We will be glad to critique your work