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An elastomer was suddenly stretched in tension and the elongation was held constant. After 10 min, the tensile stress in the polymer dropped by 12%. After an extremely long time the stress dropped to 48% of its original value.
A. Find the relaxation time, τ , for stress relaxation.
B. How long will it take the stress to drop to 75% of its initial value?
A water pump increases water pressure from 10 psia to 50 psi. Determine the power input required in hp to pump 1.2 ft^3/s of water. Does water temp in the inlet heavy any effect on the required flow?
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The impact force of a water jet is measured on a plane or a curved surface - You must determine the relationship between volume flowrate and the impact force.
a 1-mm-thick bcc iron foil is used to separate a region of high nitrogen gas concentration of 0.1 atomic percent from a
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