Circle the letter of the sentence that explains why no machine is 100% efficient. a. electrical energy is transformed to mechanical energy by fuel. b. mechanical energy is transformed to thermal energy by friction. c. thermal energy is transformed to mechanical energy by friction. d. mechanical energy is transformed to electrical energy by a spark.

What is the maximum acceleration of the wing tips, in units of g?

Porque crees que el agua no podia subir mas de 10 m de altura con ese tipo de bomba

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.