On the way out of the school parking lot on a Friday Mr. Cook, not paying attention, runs into the back of Mr. Cannon’s car. If Mr. Cook’s truck has a mass of 2000Kg, and is accelerating at 5m/s/s, with what force would he hit Mr. Cannon?

What is the most useful equation for electric power?

The mass of a bowling ball is 10 kg and the mass of a ping pong ball is 0.015 kg. if the two objects are 5 meters apart, what is the gravitational force ?

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.