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A spherical mini submarine of diameter 3 m is designed to be operated by two persons. The submarine is used for deep sea exploration where the water temperature may be as low as 6 degrees C. It was found that under such conditions the inside air temperature is uncomfortably cold. Specify the capacity of an electric heater that will maintain an inside temperature of 21 degrees C. Power source limitation requires that the heater does not use more than 500 W. Furthermore, weight consideration limits the increase in weight to a maximum of 34 kg. The inside heat transfer coefficient is estimated to be 12 W/m^2-C. However there is considerable uncertainty regarding the outside heat transfer coefficient. A very rough estimate suggest that it could be as high as 100 W/m^2-.
Consider 1.0 kg of austenite containing 1.15 wt% C, cooled to below 727 degrees Celcius (1341 degrees Farenheit).
one pound-mass of air at 78 degrees f and 75 psia is contained in a piston-cylinder device. during a reversible process
sometime when riding an elevator or driving up or down a hilly road a persons ears pop as the pressure difference
a 20 mm id steel tube carries liquid at 10 mpa. assume that the tubing is very long. determine the principal stresses
a gas contained in a piston cylinder assembly undergoes a process from state 1 to state 2 defined by the following
cylinder b has a velocity of 1.517 fts downward at t0 and a constant upward acceleration of 0.372 fts2. determine the
a standard steel specimen of 13 mm diameter elongated 22 mm when it was subjected to a tensile force of 29.5 kN if the specimen has a length of 200 mm and that force applied within elastic range. what is the elastic modulus of elasticity ?
gold au forms a substitutional solid with silver ag. compute the weight percent of gold that must be added to silver to
a one shell two tube pass surface condenser is required to handle the exhaust from a steam turbine developing 14 300 kw
energy is added to a piston cylinder arrangement, and the piston is withdrawn in such a way that the quantity PV remains constant. the initial pressure and volume are 200kpa and 2m3, respectively. the final pressure is 100kpa, calculate the work d..
Block B of the mechanism is confined to move within the slot member CD. If AB is rotating at a constant rate of AB = 3rad/s, determine the angular velocity and angular acceleration of member CD at the instant shown.
an adiabatic pump operating at steady state compresses liquid water from an initial condition of 10 bar and 40degc to a
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