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A person conducts an experiment in which he rides in an elevator while standing on a set of scales that displays his weight in pounds (Fig. a). Let a be the elevator's upward acceleration rela tive to the earth. The forces acting on the person are his weight W = 150 lb and the force N exerted on him by the scales (Fig. b).
(a) If the scales read 155 lb, what is the elevator acceleration?
(b) If the elevator acceleration is a = -2 ft/s2 , what do the scales read?
Assume a labor rate of $50.00/hr and a burden rate of $25/hr. Assume a surface speed of 2000 ft/min. The number of teeth on the cutter is 4. The feed is 0.005 in/tooth. The depth of cut is 0.020”. The width of cut is equal to the diameter of the t..
The diameter of the steel pin at C is 0.375in and the ultimate shear strength is 54ksi. If a factor of safety of 2.0 is required in both the strut and the pin at C. determine the maximum load P that can be supported by the structure.
Compute the total force on the sign if it is faced into a 100-mph wind. The air is at -20°F.
A pump is employed to deliver liquid water from a pond to a higher elevation. The pump steadily draws water from the pond at a volumetric flow rate of 192 gal/min through a pipe having a 7 in diameter inlet. The exit diameter of the pipe is 2 in. and..
a regenerative steam cycle operates between the limits of 80 bar 540oc and 0.05 bar. if only one extraction from the
A car having a mass of 5500 kg is pulled slowly up a steep inclined track by a steel cable (see figure). The cable has an effective cross-sectional area of 320 mm2, and the angle of the incline is 310.
the link DE is 3mm thick and 25 mm width,determine the normal stress in the central portion of the link.
the comubstion chamber of a liquid-h2liquid-o2 fueled rocket produces a steady-state-steady-flow of h2osuperheated
Discuss some of the circumstances where mechanical ventilation is required in the welding standards.
gold and silicon are mutually insoluble in the solid state and form a eutectic system with at eutectic temperature of
Consider the (eight) n = 2 states, 12 / m1 ms}. Find the energy of each state, under strong-field Zeeman splitting. Express each answer as the sum of three tenns:
a horizontal pipe has an abrupt expansion from d1 8 cm to d2 16 cm. the water velocity in thenbspsmaller pipe is 15
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