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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)
What is the difference between unit cell and primitive cell In primitive cell, number of atoms per unit cell is one while if number of atoms per unit cell is greater than one i
When a metal becomes a superconductor, there is a tremendous decrease in it's: a) Total volume b) Electrical resistance c) Length d) Density Ans: While a
The time needed for a net force of 10 newtons to change the velocity of a 5 kilograms mass by 3 meters/second is: a) 1.5 seconds b) 6 seconds c) 16.7 seconds d
1). A ring of outer diameter 80 cm is made from square of cross -section steel bar size(8 *8 cm) . If relative permeability 1200 for steel . calculate the current needed to produce
Newton's law of universal gravitation (Sir I. Newton): Two bodies attract to each other with equal & opposite forces; the magnitude of this force is proportional to the produ
A CAR MOVING AT 25m/s ALONG A STRAIGHT LEVEL ROAD EXPERIENCE A RESISTANCE WHICH PRODUCES A RETARDATION OF 0.0001 V^3,WHERE V IS THE VELOCITY IN m/s.FIND THE DISTANCE TRAVELLED AND
Faraday's second law of electrolysis: The charge Q needed to deposit or liberate a mass m is proportional to the charge z of the mass, the ion and inversely proportional to th
An alpa particle is directed vertically upward with a speed of 3 X 104 Km/Sec in a region where a magnetic field of magnitude 1 Tesla exists in the direction south to north. Determ
Explain the Natural Frequencies and Resonance Standing waves occur when the waves, like those in a vibrating piece of rope, are repeating so that there are places on the rope t
a) Heat produced or absorbed at a junction is proportional to the current by the junction. b) This effect is produced when current is passed by junction of suitable materials.
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