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Which modification to a solenoid would be most likely to decrease the strength of its magnetic field?
removing its iron rod core and increasing the number of coils
increasing the current and reducing the number of coils
reducing the number of coils and inserting an iron core
decreasing the current and reducing the number of coils

Astudent looks at ocean waves coming into the beach. an ocean wave with more energy will a) have a greater height. b) have a greater period. c) travel toward the beach faster. d) strike the beach with greater frequency.

The least penetrating form of radiation is

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.