Guidelines: You must adhere to Homework Guidelines for full credit! Do the follo
ID: 1660213 • Letter: G
Question
Guidelines: You must adhere to Homework Guidelines for full credit! Do the following 7 problems: 28 points (Problems 1-6: 3 points each, problem 6: 10 points) Please keep in mind that homework is due at the beginning of lecture. Multiple choice 1. The cost of running a set of eight 100 watt light bulbs for 6 hours, with the cost of electricity at 9¢ per kWh, is approximately a. 5¢ b. 24c c. 43 d. 54C e. 72c 2. What is the minimum work that a motor must do to lift a 70 lb object from the floor to a height of 14 feet? a. 5 b. 70 c. 700 d. 980 e. 2010 fitJbs. If a ½-horsepower ventilation fan in a poultry house runs for 15 hours per week, what is its total energy use in kilowatt hours for the year? 3. 4. Work is done that amounts to 6,300 Joules. Express this amount of in N-m and kWh 5. In one hour, 500x103 ft-lb of work is done. What is the average power in kilowatts?Explanation / Answer
1)
First calculate the total energy consumed(in kWh):
E = 8 x 100 x 6 Wh
= 4800 Wh
= 4.8 kWh
cost of 1 kWh = 9
Therefore, cost of 0.6 kWh = 4.8 * 9
= 43 (ans option c)
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