What causes the geological activity seen on some of the inner moons of Jupiter?
a. Constant collisions with space debris provide a power source for geological activity.
b. The strong magnetic field of Jupiter heats the surface of the inner moons.
c. Tidal friction as a result of being so close Jupiter heats their interiors.
d. Solar radiation reflected of Jupiter's surface provides a power source for geological activity.
C
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Which of the following is not known to result in a high probability of a solvent penetrating a polymer?
(a) Similar solubility parameters for the solvent and polymer (b) A similar molecular mass for the solvent and polymer molecules (c) Similar bond types between molecules of the solvent and polymer (d) Similar molecular structure on the solvent and polymer molecules
About how long is the solar cycle (evidenced by sunspots)?
A. 3 years B. 11 years C. 22 years D. 5 days
According to Hubble's Law, the greater a galaxy's redshift, the:
A) closer it is to us. B) younger it is. C) faster it's approaching us. D) farther it is from us. E) greater its mass.
A simple solar heater consists of a flat plate of glass below which is located a shallow pan filled with water, so that the water is in contact with the glass plate above it. Solar radiation is passing through the glass at the rate of 490 W/m2. The water is at 92°C and the surrounding air is 27°C. If the heat transfer coefficients between the water and the glass and the glass and the air are 28 W/(m2 K), and 7 W/(m2 K), respectively, determine the time required to transfer 1.1 MJ/m2 of surface to the water in the pan. The lower surface of the pan may be assumed to be insulated.
GIVEN
• A simple solar heater: shallow pan of water below glass, the water touches the glass
• Solar radiation passing through glass (qr/A) = 490 W/m2
• Water temperature (Tw) = 92°C
• Surrounding air temperature (T?) = 27°C
• Heat transfer coefficients
? Between water and glass ( cw h ) = 28 W/(m2 K)
? Between glass and air ( ca h ) = 7 W/(m2 K)
FIND
• The time (t) required to transfer 1.1 MJ/m2 to the water
ASSUMPTIONS
• One dimensional, steady state heat transfer prevails
• The heat loss from the bottom of the pan is negligible
• The radiative loss from the top of the glass is negligible
• The thermal resistance of the glass is negligible
SKETCH
