Like Mars and Venus, Earth originally had a significant amount of carbon dioxide in its atmosphere. Where is the majority of the carbon now?
a. It has escaped into outer space.
b. It is bound up in the plant life on Earth.
c. It is bound up in rocks.
d. It is dissolved into the oceans.
e. It is still in the atmosphere in the form of complex molecules.
c. It is bound up in rocks.
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In a single-pass counterflow heat exchanger, 1.25 kg/s of water enter at 15°C and cools 2.5 kg/s of an oil having a specific heat of 2093 J/(kg K) from 95°C to 65°C. If the overall heat transfer coefficient is 280 W/(m2 K), determine the surface area required.
GIVEN
• Water cooling oil in a single-pass counterflow heat exchanger
• Water flow rate ( m w)= 1.25 kg/s
• Oil flow rate ( m o)= 2.5 kg/s
• Oil specific heat (cpo) = 2093 J/(kg K)
• Water inlet temperature (Tw, in) = 15°C
• Oil temperature
? To, in = 95°C
? To, out = 65°C
• Overall heat transfer coefficient (U) = 280 W/(m2 K)
FIND
• The surface area (A) required
SKETCH
PROPERTIES AND CONSTANTS
the specific heat of water (cpw) = 4187 J/(kg K)
If you leave the refrigerator door open in a closed room, the room temperature will
A) increase. B) decrease. C) be unaffected.
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A diver shines an underwater searchlight at the surface of a pond (n = 1.33). At what angle (relative to the surface) will the light be totally reflected?
a. 47.3° b. 41.2° c. 51.1° d. 58.7° e. 49.8°