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A square-threaded power screw with single thread is used to raise a load of 25,000 lb. The screw has a mean diameter of 1 in. and four threads per inch. The collar mean diameter is 1.5 in. The coefficient of friction is estimated as 0.1 for both the thread and the collar.
(a) What is the major diameter of the screw?
(b) Estimate the screw torque required to raise the load.
(c) If collar friction is eliminated, what minimum value of thread coefficient of friction is needed to prevent the screw from overhauling?
a thin-walled cylindrical pressure vessel of 250 mm internal diameter and 5 mm thickness is subjected to an internal
The compression strength of Kevlar 49 fiber is about one-eight of its tensile stress. Estimate the smallest diameter of a rod on which 12 um diameter Kevlar fiber can be wound without causing kinks on its compression side.
Estimate (a) the wing span, (b) the aspect ratio, and (c) the induced drag. Take density of air to be 0.7 Kg/m3. Assume that the factors for induced drag and the lift slope, d and t, respectively, are equal to 0.01; i.e., d = t = 0.01.
air is considered as an ideal gas. dont use gas table for gas properties just assume that both cv and cp are constants.
Determine the surface temperature of the wire during a windy day when the air temperature is 10°C and the wind is blowing across the transmission line at 50 km/h.
a house has a composite wall of plaster board lp 10mm k0.72 wm.k fibre glass insulation lb100mm k1.4 wm.k and plywood
There is a membrane made of an isotropic material whose elastic modulus and Poisson's ratios are E and v, respectively. When this membrane is elongated along x-direction with no lateral deformation in y-direction, the apparent elastic modulus (E') de..
Calculate the equivalence ratio, the maximum pressure and temperature achieved during the cycle, and also the composition (by volume) of the dry exhaust gas.
Can you name this device? I mean what is this name and explain in details.
A simply supported beam is carrying a distributed and point load as are shown in the figure. Find the beam dimension a such that the normal stress in the beam does not exceed 2 MPa
a one-dimensional plane wall of thickness 2l100mm experiences uniform thermal energy generation of q dot1000 wm3 and is
Using the appropriate table, determine the change in specific entropy between the two specified states, in Btu/lb.oR. Show the states on a sketch of the T-s diagram.
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