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Cooling towers are large evaporative cooling systems that can be used to transfer heat from warm water to the atmosphere by evaporation of the water to be cooled.
Prepare a preliminary design for a cooling tower that will cool 30,000 kg/s of water from 40.0°C to 30.0°C. Atmospheric air enters at 20 ± 10°C with a relative humidity of 45 ± 15%.
Establish the overall physical dimensions of the cooling tower, air flow rate, water pumping power, fan power (if forced convection is used), makeup water requirements, air exit conditions, and so forth (Figure below).
A straight wire of mass 200 g and length 1.5 m carries a current of 2 A. What is the magnitude of the magnetic field
An object is launched vertically from near the surface of the Earth at at velocity of 100.0 m/s, What is its acceleration at its maximum height
A coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (3.17 m, 4.21 m) while a constant force acts on it. How much work is done by the force on the coin
Objects with masses of 145kg and a 445kg are separated by 0.330m. At what position (other than infinitely remote ones) can the 32kg object be placed so as to experience the net force of zero.
a what is de broglies hypothesis? derive the formula for de broglies wavelength for a particle of mass m from the basic
At any point the magnetic field lines are in the direction of: As used in the laws of refraction and reflection, the "normal" direction i
Tension is maintained in a string as in the figure below. The observed wave speed is 27 m/s when the suspended mass is 3.0 kg. What is the mass per unit length of the string
Forces are vector quantities with units of Newtons (N); 9.8 N of force are required to support 1.0 liter of water near the surface of the Earth. In this question, you eventually have to add three forces acting on a particular object so as to find ..
A charge of -270e is uniformly spread through the volume of a sphere of radius 2.10 cm. What is the volume charge density in that sphere
A machine part rotates at an angular speed of 0.44 rad/s; its speed is then increased to 1.5 rad/s at an angular acceleration of 0.78 rad/s2. Find the angle through which the part rotates
Two astronauts, one of mass 60 kg and the other 82 kg, are initially at rest in outer space. They then push each other apart. How far apart are they when the lighter astronaut has moved 11 m?
In South Korea, random samples by Gallup Korea had margins of error (we will give more detail in later chapters) of ±4% for the general public and 9% for Pentecostals. What do you think explains the fact that estimates for Pentecostals were less prec..
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