Rotational Mechanics: Finding the angle of rotation.

The wheel of a motor, accelerated uniformly from rest, rotates through 2.5 rad during the first second. Find the angle rotated during the next second.

Determining the gravitational potential energy.

Find the work done in bringing three particles each having a mass of 100g from large distances to the vertices of an equilateral triangle of side 20cm.

Working with Bernoulli's Principle.

An airplane flying at high altitude contains 100m^3 of air at STP(273 degrees and 1 atm). If a 1-cm^2 hole suddenly develops in the cabin wall, how long will it take for cabin pressure to drop by half?

Question pertaining to a 3rd-class lever and angular velocity.

I need to show mathematically how two 3rd-class levers joined together in a series increase angular velocity versus using a single 3rd-class lever. For example, a football player kicking the ball from the tee. I need to compare when he kicks it with his kicking leg maintained in a straight condition, i.e. only his hip joint rotating (keeping his knee locked allowing no rotation at the knee)..as a single 3rd-class lever, versus, more typically, kicking the ball normally by allowing both his hip and knee to rotate during the kicking event. In other words, I need to show how the angular velocity of the kicker's foot is increased when he rotates both knee and hip during the kicking action and... click for more

Time to remove a table cloth from a table and leave a glass standing

What is the longest time in which the cloth can be pulled out so that a glass 6 inches fom the edge comes to a rest before falling off the table? Assume that the coefficient of friction of the glass sliding on the tablecloth or sliding on the tabletop is .5.(for the trick to be effective the cloth should be pulled out so rapidly that the glass does not move appreciably)