Two 1 mhz radio antennas emitting in-phase are separated by600
m along a north-south line. a radio reciever placed 2 kmeast is
equidistant from both transmitting antennas and picks up afairly
strong signal. how far north should that receiver bemoved if it is
again to detect a signal nearly as strong?

An insulated thermos contains 148 g of water at 72.7 ˚c. you put in a 11.7 g ice cube at 0.00 ˚c to form a system of ice + original water. the specific heat of liquid water is 4190 j/kg•k; and the heat of fusion of water is 333 kj/kg. what is the net entropy change of the system from then until the system reaches the final (equilibrium) temperature?