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Calculate the top heat-loss coefficient for a solar collector with a single glass cover having the following specifications (neglect edge effects), also calculate the ambient air temperature:
Overall heat-loss coefficient 3.46 W/(m2.K)
Convection heat-transfer coefficient (hc,p-c) 2.65 W/(m2.K)
Spacing between the plate and the cover 2.5 cm
Plate emissivity 0.2
Glass emissivity 0.88
Back insulation thickness 5 cm
Conductivity of back insulation material 0.045 W/(m.K)
Mean plate temperature 373 K
Temperature of cover 298 K
Collector tilt 45o
Wind heat transfer coefficient 10 W/(m2.K)
And then did he sit up.IS THIS A SENTENCE OR A QUESTION
A 65g ball with a diameter of 3.1cm begins at rest and rolls down an incline. The angular acceleration of the ball is a constant 0.55rad/s2. ( I ball=(2/5)mr2 ) Calculate the net t
Define the Ray Diagrams for Lenses When drawing ray diagrams for thin lenses, we can assume that the lens is infinitely thin. Instead of considering refractions at each surface o
A string of cross section 2cm2 is doubled in length by the application of a longitudinal force 2*10 5 dynes. The youngs modulus is
why is nichrome wire used in electric heaters? properties of nichrome wire.
note
why newtons 2nd law is called the real law of motion?
Q. State the law of conservation of electric charges? The entirety charge in an isolated system always remains constant. For instance Uranium ( 92 U 238 ) can decay by emittin
A base of rectangular vessel measures 10cm x 8cm.
The turning movement of a particle about the axis of rotation is called the angular momentum of the particle and is measured as the product of the linear momentum and the perpendic
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