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?

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.