2an oil pump is drawing 44 kw of electric power while pumping oil withrho=860kg/m3at a rate of 0.1m3/s. the inlet and outlet diameters of the pipe are 8 cm and 12 cm, respectively. if the pressure rise of oil in thepump is measured to be 500 kpa and the motor efficiency is 90 percent, determine the mechanical efficiencyof the pump.

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2