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The streptomycin in 500 g of a broth was determined by addition of 1.34 mg of the pure antibiotic containing 14C. The specific activity of this preparation was found to be 223 cpm/mg for a 30-min count. From the mixture, 0.112 mg of purified streptomycin was isolated, which produced 654 counts in 60.0 min. Calculate the concentration in parts per million streptomycin in the sample.
The block is a cube that is 300mm on each side. Assume the block is incredibly tall. At steady state, what is the velocity of the block?
Cartesian system of coordinates, centered in London, with New York in the negative x direction. At the altitude the airplane flies there is a wind, blowing horizontally from north to south (negative y direction) at a speed of 100 km/h.What must be..
a hollow sphere of aluminum with an inside radius of 0.01 m and an outside radius of 0.02 m has its outer surface
a 6 nominal pipe size schedule 40 steel pipe has a chamfered entrance and 300 ft. long. the velocity is 20 ft per sec.
a person weighs 180lbs at sea level. the radius of the earth is 3960 mi. what force is exerted on the person by the
two refrigerators are arranged in series. one of them receives 300 kjcycle from a reservoir at 300 k. the heat
a cylinderpiston arrangement contains water at 105 c 85quality with a volume of 1l. the system is heated causing the
Moist air at 35 degree C, 3 bar, and relative humidity 30% (State 1) enters a nozzle with a velocity of 50 m/s and expands in a reversible and adiabatic process such that the moist air leaving the nozzle is about to condense (State 2). Calculate the ..
in a certain industrial dryer 4 kgh of water is to be removed from a moist material. the drying is accomplished by
design a process to produce a 0.5 cm-diameter steel shaft having excellent toughness yet excellent wear and fatigue
The cord is attached to the pin at C and passes over the two pulleys at A and D. The pulley at A is attached to the smooth collar that travels along the vertical rod. Determine the velocity and acceleration of the end of the cord at B if at the ins..
A 90 percent-efficient turbine accepts water at 400 kPa in a 16-cm-diameter pipe. What is the maximum power output if the flow rate is (a) 0.08 m3=s, (b) 0.06 m3=s, and (c) 0.04 m3=s? The water is emitted to the atmosphere.
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