An airplane flying at a distance of 9.9 km from a radio transmitter receives a signal of intensity 12 μw/m2. what is the amplitude of the (a) electric and (b) magnetic component of the signal at the airplane? (c) if the transmitter radiates uniformly over a hemisphere, what is the transmission power?

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit