The sum of the kinetic and potential energy is equal to the _____________energy.
Fill in the blank(s) with the appropriate word(s).
internal
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A flat plate solar collector of 3 m ? 5 m area has an absorber plate that is to operate at a temperature of 70°C. To reduce heat losses, a glass cover is placed 0.05 m from the absorber. Its operating temperature is estimated to be 35°C. Determine the rate of heat loss from the absorber if the 3 m edge is tilted at angles of inclination from the horizontal of 0°, 30°, and 60°.
GIVEN
• A flat plate solar collector
• Area = 3 m × 5 m
• Absorber temperature (Ta) = 70°C
• Glass cover temperature (Tc) = 30°C
• Distance between absorber and cover (?) = 0.05 m
FIND
Heat loss by natural convection from the absorber of angles (?) of (a) 0°, (b) 30°, and (c) 60° from the horizontal
ASSUMPTIONS
• The space is air filled
SKETCH
PROPERTIES AND CONSTANTS
for dry air at the mean temperature of 52.5°C
Thermal expansion coefficient (?) = 0.00307 1/K
Thermal conductivity (k) = 0.0274 W/(m K)
Kinematic viscosity (?) = 18.7 × 10–6 m2/s
Prandtl number (Pr) = 0.71
Uniform Circular Motion: Shown below are the velocity and acceleration vectors for an object in several different types of motion. In which case is the object's velocity changing while its speed is not changing?
A. 
B. 
C. 
D. 
Of the jovian planets, which generates the least internal heat?
A) Pluto B) Jupiter C) Neptune D) Saturn E) Uranus
The temperature at which a liquid freezes is
A) affected by foreign ions. B) the same temperature at which its solid form melts. C) both of these D) neither of these