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Tablecloth trick If you have courage and a tight grip, you can yank a tablecloth out from under the dishes on a table. What is the longest time in which the cloth can be pulled out so that a glass 6 in from the edge comes to rest before falling off the table? Assume that the coefficient of friction of the glass sliding on the tablecloth or sliding on the tabletop is 0.5. (For the trick to be effective the cloth should be pulled out so rapidly that the glass does not move appreciably
a cylinder contains 2 kg of steam at 200 kpa and 200 c. the steam is compressed at constant pressure until its
A barrel contains a 0.120-m layer of oil floating on water that is 0.250 m deep. The density of the oil is 600 kg/m.
Diffusion in liquids commonly assumed a rigid sphere in a continuum. When would this model be most accurate?.When could it fail? Diffusion varies with viscosity to the (+1) power in gases but to the (-1) power in liquids. Why?
Water flows out through a set of thin, closely spaced blades as shown in Fig. P5.4 with a speed of V = 10 ft/s around the entire circumference of the outlet. Determine the mass flow rate through the inlet pipe.
Determine the specific flow exergy, in Btu/lbmol and Btu/lb, at 440°F, 73.5 lbf/in.2 for (a) nitrogen (N2) and (b) carbon dioxide (CO2), each modeled as an ideal gas, and relative to an exergy reference environment for which T0 5 77°F, p0 5 14.7 l..
a 5.0 kg steel block is resting on a horizontal table. the coefficient of static friction us is 0.75 and the uk is
a mass of 2.4 kg of air at 150 kpa and 12ordmc is contained in a gas-tight frictionless piston-cylinder device. the air
A flywheel can be considered as being composed of a thin disc and a rim. The rim weighs 322 lb and has diameters of 24 in. and 30 in. The disc weighs 64.4 lb. Determine the mass moment of inertia about the centroidal axis about which the flywheel ..
nitrogen gas is contained in a rigid 1-m tank initially at 10 bar 300k. heat transfer to the contents of the tank
consider a space ship in a stationary orbit around a planet. the potential energy of the ship is u-kmr where kgm is
a catheter is a specialised needle intended for long-term insertion into a vein in a patients arm. engineers are
a rigid container having a volume of 1.2 m3 contains 10 percent by volume of liquid water at 100 kpa. the remaining
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