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A high-speed elevator is being designed that must be able to travel at a maximum speed of 11.5 fts. You are asked to recommend the lift motor to use. The completely furnished carriage will have a mass of 3500 pounds. The design occupancy limit will be eight people weighing an average of 200 pounds. Since there will always be some unknowns in the actual operation of the elevator, use a Factor of Safety of 2. In other words, recommend a motor that has exactly twice the power rating needed (based on all the design limit specifications). How big of a motor, in hp, should you recommend?
A composite wall consists of a 1 mm-thick stainless steel plate (AISI 316), 2 cm of plywood, and 2 cm of low-density particle board. The stainless steel surface is maintained at 380 K while the other side loses heat to ambient air at 300 K, with conv..
why does a homogeneous isotropic material such as cast iron fail in torsion at 45 degrees while long bone is expected
a particular type of tennis racket comes in a midsize version and an oversize version. sixty percent of all customers
a particle which moves in two-dimensional motion has coordinates given in inches by x t2 - 4t 20 and y 3 sin 2t
The wheel of a crane lift is rolling on a flat rail. The radius of the wheel is 4 in, the contact length and force are 2.5 in and 1 ton respectively, and E = 30 MPa and ν = 0.3 for both parts. Determine (a) the maximum contact pressure, (b) the wi..
a long concrete retaining wall with 2.4x103 kgm3 density is used to support a soil embankment. assuming the soil
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a well-insulated piston cylinder contains 5kg of saturated mixture water at 150kpa. initially three-quarter of the mass
A launch approaches a wharf at a speed of 10.5 knots(=5.4m/s).The engine are put in the reverse when the launch is 10 m from the wharf, the retardation being 1.25m/s squared. will the launch come to rest before hitting the wharf.. If not, with wha..
wind drag can be approximated as being quadratic in speedfd av2where a is a scaling constant and v is the relative
If cable spacing is 1 m into the paper, what is the cable tension.
liquid at 23 degree c flows at 2 ms over a smooth sharp-edged flat surface 12 cm in length which is kept at 57 degree
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