An automobile engine has an efficiency of 19.0%. if it produces 23.0 kj of mechanical work per second, the heat rejected per second from the engine is closest to: (a) 77.0 kj (b) 81.5 kj (c)86.5 kj (d) 92.0 kj (e) 98.1 kj

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.