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Calculate the overall heat-loss coefficient for a solar collector with a single glass cover having the following specifications (neglect edge effects):
Spacing between the plate and the cover 5 cm
Plate emittance 0.2
Glass emittance 0.88
Ambient air temperature 283 K
Back insulation thickness 3 cm
Conductivity of back insulation material 0.04 W/(m.K)
Mean plate temperature 340 K
Collector tilts 45°
Wind - heat transfer coefficient 10 W/(m2.K)
Briefly explain how the wavelength of monochromatic light is calculated using Newton's rings arrangement?
explain air wedge
lux; lx: The derived SI unit of illuminance equivalent to the illuminance generated by a luminous flux of 1 lm distributed consistently over an area of 1 m 2 ; therefore it ha
what is atom
An object in free fall has an acceleration of 9.80 m/s 2 assuming that there is no air resistance. What is the speed of an object dropped from the top of a tall cliff 3.50 s a
Question 1. How X-rays are produced? Describe the properties of X-Rays? 2. Describe the half wave & full wave Rectifications employed in an X-ray tube? 3. Discuss the med
two students walk in the same direction along a straight path at a constant speed one at .90m/s and another at 1.90m/s. assuming that they start at the same point and same time, ho
Reducing friction with ball bearings Find two tin cans that have a deep groove approximately the top, such as paint cans. Lay marbles in single groove and invert the other can
a) Two long wires, carrying currents i 1 and i 2 , are placed perpendicular to each other in such a way that they just avoid to contact. Determine the magnetic force on a small le
The rate of flow of energy or particles across a given surface.
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