6. The loop rule and junction rule for circuits are consequences of A) conservation of energy
B) conservation of charge
C) conservation of energy and charge, respectively
D) conservation of charge and energy, respectively

The dot diagram represents the motion of the motorcycle as it moves from left to right

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.

What is the weight of a 8-kg substance in n, kn, kg·m/s2, kgf, lbm·ft/s2, and lbf?