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A freshly prepared sample of a certain radioactive isotope has an activity of 10 mCi. After 4 h, the activity is 8 mCi.
(a) Find the decay constant and half-life of the isotope.
(b) How many atoms of the isotope were contained in the freshly prepared sample?
(c) What is the sample's activity 30 h after it is prepared?
Find the slip at which the maximum developed torque occurs.
the rate of flow to an ammonia synthesis reactor contains 25 mole ltbrgtnitrogen and the balance hydrogen. the flow
Calculate the fraction of water that is condensed from the air, the relative humidity of the air at 100°C, and the ratio m3 outlet air at 100°C/m3 feed air at 90°C.
Piston arrangement: compressing air, A piston arrangement has been developed to compress air adiabatically from 360C
In the Deacon process for the manufacture of chlorine, HC1 and O2 react to form Cl2 and H20. Sufficient air (21 mole% 02, 79% N2) is fed to provide 35% excess oxygen and the fractional conversion of HCI is 85%.
Hydrogen gas at a pressure of 1.25 bar is contained in a thick-walled neoprene rubber sphere which has inner and outer radii of 70 mm and 80 mm, respectively.
design a heat exchanger for the following dutyreduced crude oil leaving a distillation unit with a flow rate of 3166.04
a super tanker is 360m long and has a width of 70m and draft of 25m. assuming that the drag is mainly due to the skin friction at the bottom and side faces and that the boundary layer develops naturally,
A sealed rigid tank is filled with 1 kg of steam at 200 °C and 10 bar. What is the volume of the tank? 0.5 kg of steam are removed from the tank. If the temperature remains at 200 °C, what is the new pressure in the tank?
You have a heat pump that takes in 256 kW of heat and puts out 604 kW of heat. What is the coefficient of performance (C.O.P.) of the system ( express this value as a fraction)?
Assuming that the flux corresponding to a current of 25 A is 40% of that corresponding to a current of 100 A, determine the motor speed at a line current of 25 A at 250 V.
show that the rotor current, torque, and electromagnetic power of a poly phase induction motor vary almost directly as the slip, for small values of slip.
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