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1. A lamina consists of 100 fibers of 10-μm diameter. The fibers are 10 mm long. Find the interfacial area. What is the increase in the interfacial area if the diameter of the fiber is reduced to 5 μm and the total volume of fibers is kept constant?
2. Compare the flexibility of a 0.01-in. diameter steel wire to a 0.02-in. diameter aluminum wire. The Young's modulus of steel is 30 Msi and that of aluminum is 10 Msi.
Rapid heating and cooling can cause cracks to start at the surface of a ceramic material. Sometimes the cracks meet the surface at 90? and sometimes at 45? to the surface.
a pump increases the water pressure from 70 kpa at the inlet to 700 kpa at the outlet. water enters this pump at 15
The only force acting on an earth satellite traveling outside of the earth’s atmosphere is the radial gravitational attraction. The moment of this force is zero about the earth’s center taken as a fixed point. Prove that r2? Remains constant for the ..
find densities, enthalpies and efficiency for gas turbine power cycle with the following conditions.
The peak power of a 6ft. diameter antenna is 10 watts and its duty cycle is 0.250. The wave length is 0.03m/cycle. Find the power density in mw/cm2 at 50 meters from the antenna.
let it cool back to the outdoor temperature, pass it through a turbine, and discharge the cold air leaving the turbine into the house. from a thermodynamic point of view, is the proposed system sound?
four forces are applied to a W200x35.9 rolled beam as shown. determine the principal stresses and maximum shearing stress at point a.
A longitudinal wave propagating in a water-filled pipe has intensity 3.00 X 10-6w/m2 and frequency 3400 Hz. Find the amplitude A and wavelength A of the wave. Water has density 1000 kg/m3 and bulk modulus 2.18 X 105 Pa.
A mixture of 30% CO2, 60% CO and 10% H2 by volume is placed in a container and maintained at 4680 R and 1 atm. Determine the composition of the mixture at equilibrium.
A long concrete beam is to undergo a thermal test to determine its loss of strength in the event of a building lire. The beam cross section is triangular as shown in the sketch.
What are the possible outcomes of this scenario?
Explain why Boehm's spiral model is an adaptable model that can support both change avoidance and change tolerance activities. In practice, this model has not been widely used. Suggest why this might be the case.
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