Rainfall rates for successive 20-minute periods of a 140-minute storm are 1.5, 1.5, 6.0, 4.0, 1.0, 0.8, and 3.2 inches/hour, totaling 6.0 inches. determine runoff during successive 20-minute periods by the nrcs method (i. e. curve number method). the soil in the basin belongs to group a. it is an agricultural row cropland with contoured pattern in good hydrologic condition.

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?

What is creep? what is stress relaxation?