S. A 79 kg skier starts from rest and skiis straight down (no turning) through a vertical elevation loss of 125m.
a) neglecting air resistance find the final velocity of the skier, (is this reasonable?)
b) If the final velocity is actually only 24 m/s, how much of the original potential energy
is converted to forms other than kinetic? What happens to the "lost energy"?

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.

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

Area around a charged object where the objects can exert a force on another charged objects is an electric