Time shifting occurs when
a. clocks move ahead one hour in the spring
b. works are copied and kept for future generations
c. individuals copy works to view at a later time
d. copyrighted materials comes into the public domain

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Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

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.