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Marine biology. Marine life depends on the microscopic plant life that exists in the photic zone, a zone that goes to a depth where only 1% of surface light remains. In some waters with a great deal of sediment, the photic zone may go down only 15 to 20 feet. In some murky harbors, the intensity of light d feet below the surface is given approximately by
What percentage of the surface light will reach a depth of
(A) 10 feet?
(B) 20 feet?
jet engine cowlings use 5 micrometer diameter whisker filaments of sic that are coated in 3 micrometer of aluminum
a rigid well-insulated tank contains a two-phrase mixture of ammonia with .0025ft3 of saturated liquid and 1.5 ft3 of
steady-state creep rate data are given for an alloy taken at 474 k with the activation energy for creep of 140000
air in the atmosphere is composed of primarily nitrogen oxygen and argon. the mole percents of the compounds are as
a household refrigerator with a cop of 1.2 removes heat from the refrigerated space at a rate of 60 kjmin. determine a
1. A six-pole, three-phase, 440-V, 60-Hz induction motor has the following model impedances: RS = 0.8 Q XS = 0.7 Q RR = 0.3 Q XR = 0.7 Q Xm = 35 Q Calculate the input current and power factor of the motor for a speed of 1,200 r/min.
a man pulls himself up the 15o incline by the method shown. if the combined mass of the man and the cart is 100 kg
Prob. 8.110 In the pivoted motor mount shown the weight W of the 175-lb motor is used to maintain tension in the drive belt
A steam power plant operates on the ideal reheat Rankine cycle. Steam enters the high pressure turbine at 6 MPa and 4000C and leaves at 2 MPa. Steam is then reheated at constant pressure to 4000C before it expands to 20 kPa in the low pressure turbin..
steam enters an adiabatic turbine at 8 mpa and 520 degc with a volumetric flow rate of 0.8 m3s and exits at 30 kpa. the
where β0 is the phase constant in free space, R is the distance from the source (antenna), and θ is the angle with respect to the vertical (z) axis.
A piston cylinder contains 1 kg of R-134a and undergoes a reversible compression process. During the process the R-134a also loses 37 kJ of heat to the environment. If the temperature of the piston remains a constant 20 oC and the initial the pressur..
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