A car accelerates from 0-30m/s in 8s. The car has a mass of 1300kg. Compute the energy needed by the car, and the energy actually used if the engine is 27% efficient. show your full work please

The energy produced as a result of this flow of electrons from atom to atom is called

In which of the following is positive work done by a person on a suitcase

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =