A heavy truck on a road outside can cause ripples in a glass of water inside a house. What is responsible for this phenomenon?
A. Waves travelling through the ground to the glass
B. Radio waves from the truck's on board radio transmitter
C. Wind from the truck passing by the house
D. Loud noises from the truck engine

A1500 w electric heater is plugged into the outlet of a 120 v circuit that has a 20 a circuit breaker. you plug an electric hair dryer into the same outlet. the hair dryer has power settings of 600 w, 900 w , 1200 w, and 1500 w. you start with the hair dryer on the 600 w setting and increase the power setting until the circuit breaker trips. under what setting does the circuit breaker trip.