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You heat 250 ml of tap water from 10 degree celcius to 100 degree celcius in 2 minutes using a microwave oven operating at 2.5 GHz. a). What is the wavelength of this electromagnetic radiation ? b) What is the name given to radiation of this wavelength ? c) How many photons did the cup of water absorb? d) What is the effective power rating of the microwave oven?
Bridge scour, Determine the magnitude of the contraction scour depth given the following information about the channel and bridge
The dry weight of a core is 28.20 gm. When saturated with a brine having a density of 1.15 gm/cc, the weight increases to 31.50 gm. Calculate the apparent porosities if the matrix is 1) quartz or 2) calcite.
determine the tangential component of the acceleration of the sled a) just before it reaches B, b) just after it passes C.
A soil has a total density of 1.80 Mg/m3. When fully dry, the soil has a density of 1.59 Mg/m3. The specific gravity of the solids is 2.57. Find the following soil parameters: a) Dry unit weight of the sample
A concentrated downward force of 2000 lb. is located 6' from the left support, and a uniformly distributed load of 200 lbs./lin. ft. begins 6' to the right end of the member. What force must be applied at each connection to maintain equilibrium?
an electrical-generation utility sometimes pump liquid water into an elevated reservoir during periods of low electrical consumption. this water is used to generate electricity during periods when the demand for electricity exceeds the utilities a..
The area is about 100,000 ha, the ground water pumping about 500 million m3 per year, and the water table drop about 3 m per year. Assuming no replenishment, what is the specific yield of the aquifer material
Biota can uptake and bioconcentrate compounds through vapor phase absorption. For example, leaves exposed to elemental mercury vapors will absorb the mercury into the aqueous phase and the lipid phases of the leaves. Kow for mercury = 4.17.
A small building that shelters a water supply pump measures 2 m x 3 m x 2.4 m high. It is constructed of 1- cm thick wood having a thermal conductivity of 0.126 W*m^-1*K^-1.
Water is pumped from a reservoir whose surface elevation is 1390 ft to a second reservoir whose surface elevation is 1475 ft. The connecting pipeline is 4500 ft long and 12 in. in diameter.
Assuming constant acceleration, determine how long the train blocked the crossing. Dis- regard the width of the crossing.
A two-phase liquid-vapor mixture of water is initially at a pressure of 10 bars. If on heating at fixed volume, the critical point is attained, determine the quality of the initial state.
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