An atom is: A. None of the above
B. A magnetic field
C. A magnetic domain
D. The smallest magnet

The air that we breath is made mostly of which gaseous molecule

What are two different ways you could find the value of a? explain these methods.

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.