Which of the state vectors below is not physically equivalent to 
?
E. They are all equivalent.
E. They are all equivalent.
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Which law of thermodynamics is a restatement of the conservation of energy as it applies to thermal systems?
A) First law B) Second law C) Third law D) all of the above
Baryon number is conserved in all interactions
Indicate whether the statement is true or false
Each white dot in this figure represents the location of a small body in our solar system. The donut-shaped ring of white dots represents the region of our solar system that we call
A) the asteroid belt. B) the Kuiper belt. C) the Oort cloud. D) the Sun's rings.
Mild steel nails were driven through a solid wood wall consisting of two layers, each 2.5- cm-thick, for reinforcement. If the total cross-sectional area of the nails is 0.5% of the wall area, determine the unit thermal conductance of the composite wall and the per cent of the total heat flow that passes through the nails when the temperature difference across the wall is 25°C. Neglect contact resistance between the wood layers.
GIVEN
• Wood wall
• Two layers 0.025-m-thick each
• Nail cross sectional area of nails = 0.5% of wall area
• Temperature difference (?T) = 25°C
FIND
(a) The unit thermal conductance (k/L) of the wall (b) Percent of total heat flow that passes through the wall
ASSUMPTIONS
• One dimensional heat transfer through the wall
• Steady state prevails
• Contact resistance between the wall layers is negligible
SKETCH
PROPERTIES AND CONSTANTS
? Wood (Pine) (kw) = 0.15 W/(m K)
? Mild steel (1% C) (ks) = 43 W/(m K)