Two radio antennas are 130 m apart on a north-south line. the two antennas radiate in phase at a frequency of 3.6 mhz. all radio measurements are made far from the antennas. the smallest angle, reckoned east of north from the antennas, at which constructive interference of two radio waves occurs, is closest to:

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

What is required for an electric charge to flow through a wire? zero resistance in the wire a balance of electric potential high resistance in the wire a difference in electric potential

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.