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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?
honda civic 2012 model has an epa rating of 28 mpg city and 39 mpg highway. what is the thermal efficiency of honda
A 3 liter vessel contains 2kg of water, 0.05kmol of steam, and 15cm^3 of ice (of density 990 kg/m^3). If the vessel is heated until its entire contents have vaporied, what is the density of the vapor?
It is desired to design a wind turbine that will output 2MW of peak electrical power at a location where the average wind speed is 10 m/s and the average ambient conditions are 85 kPa and 5 ?C. What should the rotor blade length be if the aerodynamic..
Determine the orientation of the neutral axis and calculate the maximum tensile stress σmax if b = 80 mm, h = 140 mm, L= 1.75 m, α = 22.5°, and q = 7.5 kN/m. P
A soil sample is being tested in the laboratory by cyclic shear stresses, of constant amplitude. In each cycle there are relatively large shear strains. What do you expect for the volume change in the 100th cycle? And what would that mean for the ..
If you could operate a heat engine between the plate temperature calculated in part (a) and the environment at 10°C, estimate the plate surface area required to generate power equal to the coal-fired power plant. Then comment on the result and com..
the 4-kg collar c can slide freely along the smooth rod ab. at a given instant rod ab is rotating with an angular
consider a body of arbitrary shape. if the pressure distribution over the surface of the body is constant e.g.
Using Rayleigh s method, find the fundamental frequency for the lateral vibration of the beam shown in Fig. 8.39. The restoring force in the spring k is proportional to the deflection, and the restoring moment in the spring is proportional to the ..
Progress in machine tool technology over the last 100 years has led to the continual redefinition of precision as shown in Figure 10-F, developed by Taniguchi. The trend here is very clear-that precision in machining continues to improve over time..
a 2.5 inch diameter schedule 40 pipe subject to 5000 pounds axial compression and a bending moment of 2500 in lbs.
determine the phase or phases in a system consisting of h2o at the following conditions and sketch both the p-v and t-v
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