Question

1.There are approximately 105 million households that use TVs in the United States. Each TV uses, on average, 75 W of power and is turned on for 6.0 hours a day. If electrical energy costs $0.09 per KWh, how much money is spent every day in keeping 105 million TVs turned on?

2.The rear window of a van is coated with a layer of ice at 0°C. The density of ice is 917 kg/m³. The driver of the van turns on the rear-window defroster, which operates at 12 V and 21 A. The defroster directly heats an area of 0.56 m² of the rear window. What is the maximum thickness of ice coating this area that the defroster can melt in 3.4 minutes

Answer 1