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A solution of organic colloids in water is to be concentrated from 8 to 45 percent solids in a single-effect evaporator. Steam is available at a gauge pressure of 1.03 atm (120SC). A pressure of 102 mm Hg ab, is to be maintained in the vapor space: this corresponds to a boiling point for water of 51.7°C. The feed rate to the evaporator is 20,000 kgfh. The overall heat -transfer coefficient can be taken as 2800 W/m2_ cc. The solution has a negligible elevation in boiling point and a negligible heat of dilution. Calculate the steam consumption, the economy. and the heating surface required if the temperature of the feed is
(a) 51.7°C,
(b) 21.1'C,
(c) 93.3°C. The specific heat of the feed solution is 3.77 J/g_OC, and the latent heat of vaporization of the solution may be taken equal to that of water. Radiation losses may be neglected.
A student (m= 75 kg) falls freely from rest and strikes the ground. throughout the collision with ground, he comes to rest in a time of 0.040 s. the average force exerted on him by the ground is +18 000 N.
The question asks to determine the mechanical energy that is lost as a result of the collision, not he kinetic energy. What is the mechanical energy that is lost
If our sun/solar system was formed in a dense cluster (as opposed to a sparse cluster) where are the rest of the stars. Is it possible to find any of them? How can radioisotopes be used to determine we were blasted by a supernova billions of years ag..
A ball is thrown straight up from a height of 1.56m above the ground and reaches a maximum height of 8.35m before falling to the ground. What the calls total time in the air
A cook puts 8.20 g of water in a 2.00-L pressure cooker that is then warmed to 470°C. What is the pressure inside the container
Assume the distance between the protons in the H2 molecule is 7.50 multiply.gif 10-11 m. Find the energy of the second rotational state, with J = 2
104.05 J of energy are transferred to a system in the form of heat while the internal energy decreases by 57.65 J. How much work is done by the system
An AC voltage with an amplitude of 129 V is applied to a series combination of a 163 ?F capacitor, a 121 mH inductor, and a 21.9 ? resistor. Calculate the power factor at this frequency
If a nuclear power plant produces 1200 MW (Mega Watts) of electrical power and is 30% efficient, how much energy of fuel is consumed each day
A sled is initially given a shove up a frictionless 26.0° incline. It reaches a maximum verticalheight 1.45 m higher than where itstarted. What was its initial speed
A current I = 0.2 A flows in the long solenoid in the direction shown by the arrow. What is in Teslas the magnitude of the magnetic field produced inside the long solenoid?
Kinetic friction is a constant-value force, while static friction changed in response to other forces, up to some maximum, What if static friction behaved more like kinetic friction, with same constant value
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