Prior to the invention of a revolutionary means of travel, people had to make long, dangerous journeys to cross parts of the country. Due to this development, society was revolutionized as travel became safe and efficient. Which is most likely the first invention that changed society so much? A. the airplane B. the steam engine C. the car D. the train

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.