According to newton���s first law of motion, if you roll a ball in a straight line in an open field, what will happen to the ball?
a. the ball will continue on forever.
b. the ball will slow down.
c. the ball will not change its velocity.
d. the ball will speed up.

The velocity of a curling stone is due east. what will be the direction of the momentum of the curling stone as it moves?

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

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.