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An airship is to operate in air at 20oC and 1 bar at 20 m/s speed. A model of scale 1/20 is used for tests in a wind tunnel, the test speed being 75 m/s. Determine the pressure of the tunnel for dynamic similarity. The air temperatures are equal. If the drag force on the model was 250 N. Determine the drag on the prototype
air contained in a piston-cylinder assembly is initially at 350 k 150 kpa and a volume of 0.15 l. as the cylinder is
Sketch the stress-strain behavior for the following pairs of polymers. Use the same axes for each pair: a) polystyrene at 0 and 60 degrees celsius b) high density polyethylene and low density polyethylene.
estimate the mass of ozone inhaled into the lungs by a moderately exercising individual over an eight hour period at a
A liter of water, initially at 30°C is placed in a refrigerator set to 5°C. Write the equation to find the time it takes a liter of water to cool 7°C, as a function of thermal resistance.
a refrigeration system using r-22 as the working fluid has condenser and evaporator pressures of 250 psi and 30 psi
a new 600 mw power plant 0.35 efficiency uses an illinois basin coal. assume the fgd system removes enough sulfur so
1 when a computer is turned off its cpu begins to cool off. imagine that the internal energy of the cpu is given by u
a power unit has a power rating of 30 kw and supplies flow at a rate of 60 lpm, what is the maximum pressure this unit can withstand?
a ball is dropped from a boat so that it strikes the surface of a lake with speed 16.5 fts. while in the water the
a first class lever in static equilibrium has a 50lb resistance force and a 15lb effort force. the levers effort force is located 4ft from the fulcrum. what is the actual mechanical advantage of the system?
consider a pistoncylinder arrangement that has a linear spring mounted such that as the piston rises to a certain point
What is the heat loss per unit surface area of the composite? Sketch the temperature distribution from the gas to the liquid.
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