A 2.0 mm -diameter copper wire carries a 40 A current (uniform across its cross section). Determine the magnetic field at the surface of the wire. Express your answer using two significant figures.

Gas cloud 1 is likely to form a star. gas cloud 2 is not. based on this information, match the given conditions with each cloud

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.