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A 25-mm-diameter shaft is pulled through a cylindrical bearing as shown in Fig. The lubricant that fills the 0.3-mm gap between the shaft and bearing is an oil having a kinematic viscosity of 8.0 ×10-4 m2/s and a specific gravity of 0.91. Determine the force F required to pull the shaft at a velocity of 3 m/s. Assume the velocity distribution in the gap is linear.
A double-wall heat exchanger is used to transfer heat between liquids flowing through semicircular copper tubes. Each tube has a wall thickness of t = 3 mm and an inner radius of ri = 20 mm, and good contact is maintained at the plane surfaces by ..
Liquid water at 200 kPa and 20 C is heated in a chamber by mixing it with superheated steam at 200 kPa and 150 C. Liquid water enters the mixing chamber at a rate of 1.3 kg/s, and the chamber is estimated to lose heat to the surrounding air at 25 C a..
an automobile having a mass of 2000 kg deflects its suspension springs 0.02 m under static conditions. Determine the natural frecuency of the automobile in the vertical direction by assuming dumping to be negligible.
how much heat in kj must be added to 2 kg of steam initially at t1 300oc contained within a rigid volume to increase
the thickness of a set of gaskets varies because of random manufacturing disturbances but the thickness values measured
glycerin at 40 degree c with a rho 1252 kgm3 and mu 0.27 kgm s is flowing through a 2cm diameter 25m long pipe that
What is the minimum possible curvature of the glass layer of the thickness L before it cracks (fig. 3.33), if the critical tensile stress is σ* and the Young modulus is E? On which surface does the crack initiate?
a 50 kg crate rests on a rough horizontal surface with microk0.3. an electrically powered winch is utilize to
If the lifetime earnings of a high-school graduate average $1,200,000, what is the expected value of earning a college degree?
1. How does the control volume energy rate balance account for work where mass flows across the boundary? 2. Why does the relative velocity normal to the flow boundary, Vn, appear in Eqs. 4.3 and 4.8?
The x and y components of velocity for a two-dimensional flow are u = 5y ft/s and v = 4 ft/s, where y is in feet. Determine the equation for the streamlines. Use C as constant. Round all numbers in answer to 3 significant digits.
air at -10 degree c flows over a smooth sharp-edged almost-flat aerodynamic surface at 240 kmhr. the surface is at 10
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