Word problems: What is the possible power (kW) production from a 32 m radius win

Question

Word problems:

What is the possible power (kW) production from a 32 m radius wind turbine if the average wind speed is 12 m/s? Assume an ambient air density of 1.20 kg/m3. Mow many wind turbines from Problem 5 would need to be installed to replace the Hoover Dam hydro-electric plant power generating capacity discussed in Problem 4? Provide a commentary to actual number of wind turbines needed. Consider a well sealed, well insulated room with a common household refrigerator/freezer unit, What type of energy crosses the room boundary? If the refrigerator/freezer operates at 120 V, 4 Amp for four hours a day, how much energy (kW-h) is consumed each day? If electricity cost dollar 0.12/kW-h, how much does it cost to operate the refrigerator in a year?

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