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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)
Q. Orbital Velocity for Low Earth Orbit Neglecting air friction an object will sustain a low altitude orbit when the centrifugal force due to its motion in a circular orbit is
Q. What is the force essential to accelerate a mass of one kilogram one meter per second per second? Answer:- Fundamentally you have defined the Newton. Force is the ve
a) Sketch the small-signal equivalent circuit for a field-effect transistor (FET) and explain how it can be deduced from the properties of the real device. b) Draw the circuit
the unit of force and length are doubled, the unit of energy will be
Average acceleration is described as the change in velocity over a given time interval Δt. Hence, The instantaneous acceleration of given particle is the rat
It is the magnetic flux density which still remains in magnetic materials even when the magnetic force is removed. It is measured or calculated in Weber/m 2 .
Spectrum and electromagnetic radiations: What is a spectrum? Ans: A spectrum is a group of wave lengths or frequencies. What are the electromagnetic radiations? Ans:
describe the construction and working of michelson''s interferometer explain the formation of circular fringes how will you use these fringis in the determination of difference in
Q. Ski Saga Problem? James Bond is skiing down a snowy slope in an attempt to run off a hostile pursuer. Unfortunately the pursuer has a speed advantage since James is only abl
what do you mean by nuclear fusion and fusion? explain briefly giving certain examples.
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