one person exerts 3J per step with a 5 ft stride length between each step. if you were to install 30 feet of electric panel material in the city and an average of 28000 people walked over these panels twice a day what is the total energy that could be harvested?

A company pays the electric company at a rate of $0.18 per kilowatt-hour for their power. The factory uses three ventilator fans to keep the workers safe from dust. Each fan has a 1 horsepower motor. The company runs the fans continuously 24/7. How much is the company’s energy cost per month (30 days) to operate the ventilation system?

Gasoline and ethanol can both be used as a fuel source in cars.  However, the potential chemical energy is not equal.  A fuel mixture uses 85% ethanol and 15% gasoline called E85.  Assume a car is rated at 28.0 miles/gallon using gasoline only at $3.50/gallon and 22.5 miles/gallon using E85 at $2.85/gallon.  How much would it cost for using each fuel to drive 500.0 miles?

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A system undergoes a process consisting of the following two steps: Step 1: The system absorbs 74 J of heat while 36 J of work is done on it. Step 2: The system absorbs 36 J of heat while performing 74 J of work. Calculate AE for the overall process. AE = J

It took 16641664 J to raise the temperature of a sample of water from 12.512.5 °C to 34.534.5 °C. Convert 16641664 J to calories.