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Water flows at 50oC inside a 2.5-cm-inside-diameter tube such that hi= 3500 W/m2 oC. The tube has a wall thickness of 0.8 mm with a thermal conductivity of 16 W/m2 oC. The outside of the tube loses heat by free convection with ho = 7.6 W/m2 oC. Calculate the overall heat-transfer coefficient and heat loss per unit length to surrounding air at 20oC.
steam having a specific enthalpy of 160 kjkg and pressure of 1 kpa enters as adiabatic pump. upon leaving the pump the
A 40 mm diameter hole is drilled 3 m deep into the steel shaft. When the two torque are applied, determine (a) the maximum shear stress in the shaft: and (b) the angle of rotation of the free end of the shaft. Use G= 83GPa for steel.
for a first order system with a transfer function of 15s2 given a unit step input pleasea. derive the transfer function
a thin-walled cylindrical pressure vessel of 250 mm internal diameter and 5 mm thickness is subjected to an internal
electric power is to be generated in a hydroelectric power plant that receives water at a rate of 70 m3s from an
a cylinder made of astm a242 steel is 50cm in diameter and 250mm long and has a wall thickness of 24mm. a round bar of
gusset plate Determine the resultant of the three forces tha must be carried by the gusset plate. 30 degrees off of the wall and F1, F1 = 10k, F2 = 12k, F3 = 18k
steam with 88.6% quality and a flow rate of 750 kg/s enters a condenser operating @ 75 KPa. Saturated liquid leaves the condenser. How much heat is rejected to the cooling system.
consider an ideal steam regenerative cycle in which steam enters the turbine at 600 lbfin2 700 f and exhausts to the
the initially stationary uniform disk of mass m1 and radius b is allowed to drop onto the moving belt from a very small
assuming there are both a pressure gage and a manometer attached to a gas tank which has a pressure lower than patm. if
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