The _____________is the internal energy plus the pressure times the volume.
Fill in the blank(s) with the appropriate word(s).
enthalpy
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A thin electronic circuit board, 0.1 m by 0.1 m in size, is to be cooled in air at 25°C. The board is placed in a vertical position and the back side is well insulated. If the heat dissipation is uniform at 200 W/m2, determine the average temperature of the surface of the board cover.
GIVEN
• Vertical circuit board in air
• Back is well insulated
• Board dimensions (L × H) = 0.1 m × 0.1 m
• Air temperature (T ?) = 25°C
• Uniform heat dissipation rate ( q G/A) = 200 W/m2
FIND
• The average temperature of the surface of the board (Ts)
ASSUMPTIONS
• Ambient air is still
• The board has reached steady state
• Radiation is negligible
SKETCH
Chemically based extraterrestrial life
A) will not need to store information B) may not use DNA to store information but will very likely use a molecule with a similar function C) will certainly use DNA to store information, but with different nucleotides D) will certainly use DNA to store information
If one could observe the individual atoms making up a piece of matter and note that during a process of change their motion somehow became more orderly, then one may assume which of the following in regard to the system?
a. increases in entropy b. decreases in entropy c. gains in thermal energy d. positive work done on
Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it? The nearest value is:
a. 4.0 cm. c. 16 cm. b. 9.8 cm. d. 20 cm.