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The velocity profile in the annular control volume of Example is approximately linear, varying from a velocity of zero at the outer boundary to a value of ωd/2 at the inner boundary. Develop an expression for the fluid velocity, v(r), where r is the distance from the center of the shaft.
ExampleA shaft is rotating at constant angular velocity ω in the bearing shown in Figure. The shaft diameter is d and the shear stress acting on the shaft is τ. Find the rate at which energy must be removed from the bearing in order that the lubricating oil between the rotating shaft and the stationary bearing surface remains at constant temperature.
Atomic radius and atomic weight of niobium are 0.143nm and 92.91 g/mol respectively. Calculate Nb density assuming (1) FCC, and (b) BCC crystal structures. Compare the values with t the available Nb density from the textbook (Materials Science and En..
a post-hole digger is mouted on a tractor. the power unit of the machine applies a torque of 800 lb.in to the auger and
air compressor is a single acting two cylinder unit which takes in an air volume of 0.2 m3s. the initial absolute
Find the mass moment of inertia of a tool steel part.x1 = 126.0mm, x2 = 75.0mm
Three children are standing on a 5×5-m raft. The weights of the children at Points A, B, and C are 375 N, 260 N, and 400 N, respectively. If a fourth child of weight 425 N climbs onto the raft, determine where she should stand if the other children r..
The inlet flow is air at 110 kPa and 20°C, moving at an average velocity of 6 m/s. Estimate the pressure drop across the honeycomb.
i water vapor enters a turbine at p1 5 bar t1320oc and exits at p2 1 bar. the work generated is measure as 250 kj per
incoming air flow of 200 m3h at a temperature of 20oc and a humidity ratio of 0.012 kgvkga is mixed in a chamber with
The product of the heat transfer coefficient h and outer surface area A is 35 Btu/h ? °R. For the gearbox,
An inventor claims to have developed a refrigerator that at steady state requires a net power input of 0.7 horsepower to remove 12,000 Btu/h of energy by heat transfer from the freezer compartment at 08F and discharge energy by heat transfer to a ..
consider a finite wing with an aspect ratio of 7 the airfoil section of the wing is a symmetric airfoil with an
two spinning discs have the same angular momentum, but disk 1 has more kinetic energy than disk 2. Which one has the bigger moment of inertia - explain your reasoning?
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