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Free convection occurs between concentric spheres. The inner sphere is of diameter Di = 50 mm and tem- perature Ti = 50°C, while the outer sphere is main- tained at To = 20°C. Air is in the gap between the spheres. What outer sphere diameter is required so that the convection heat transfer from the inner sphere is the same as if it were placed in a large, quiescent environ- ment with air at Too = 20°C?
a stone wall in an old house can be modeled as a homogenous plane wall 225 mm thick. estimate the heat loss through the
assume air flows isentropically through a converging-diverging nozzle. at station 1 which is aft of the throat and has
Water from a low dam is released through a sluice gate on a horizontal rectangular channel. The depth of water upstream of the sluice gate is 16.0 m above the channel bed andthe gate opening is 1.5 m.
air as an ideal gas with cp 0.241 btulbr is compressed from a state where the pressure is 3 atm and the temperature is
air at 30 degree c 80 rh is cooled by spraying water at 12degreec. this causes saturation followed by condensation the
A car has an initial speed of 25 m/s with a constant deceleration of 3m/s^2. Determine the velocity of the car when t=4s. What is the displacement of the car during the 4 second time interval? How much time is needed to stop the car?
a 20-kg uniform cylindrical roller initially at rest is acted upon by a 90-n force as shown. knowing that the body
a dredger is pulling sand from the bottom of a harbor and loading it onto a barge. the sand sg 2.6 leaves the dredger
the beam ab is pin supported at a and supported by a cable BC. determine the resultant internal loadings acting on the cross section at points d and e.
two concentric helical compression springs made of steel and having the same length when loaded and when unloaded are
the compression ratio of an ideal dual cycle is 14. air is at 100 kpa and 300 k at the beginning of the compression
consider a brayton cycle and assume variable specific heats for air. air enters the compressor of a gas-turbine engine
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