Water at 20°c flows by gravity through a smooth pipe from one reservoir to a lower one. the elevation difference is 60 m. the pipe is 360 m long, with a diameter of 12 cm. for the given system a pump is used at night to drive water back to the upper reservoir. if the pump delivers 15,000 w to the water, estimate the flow rate. for water at 20°c, take rho = 998 kg/m3 and μ = 0.001 kg/m-s. round the answer to the nearest whole number.
Answers: 1
Physics, 22.06.2019 19:50, fili20
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.
Answers: 3
Physics, 23.06.2019 00:00, kerena8291
You can estimate the degree to which a bond between two atoms is ionic or covalent by calculating the
Answers: 3
Water at 20°c flows by gravity through a smooth pipe from one reservoir to a lower one. the elevatio...