1.A pump of 80% efficiency lifts water from one large open tank to another; the difference in water surface elevations is 20 feet. The pipe is relatively smooth (f = 0.0122), and has 3 elbows, each with a loss coefficient of 2/3. The pipe is 4-inches in diameter and 40 feet long. The kinematic viscosity of water is 10-5 ft2/sec. What horsepower must be supplied to the pump in order to convey 2 CFS through the system? (Kent = .5) Assume a submerged exit.
a).7.8 HP
b).17.2 HP
c).26.5 HP
d).34.6 HP
2.A gas is containied in a vertical frictionless piston cylinder device. the piston has a mass of 20kg with a cross-sectional area of 20cm^2 and is pulled with a force of 100n. if the atmospheric pressure is 100kpa determine the pressure inside.