If one of the caissons of the Falkirk Wheel contained a sunken boat, resting on its bottom, and the other carried a floating boat, the wheel balance would
A) still be maintained.
B) be upset and more energy would be needed for operation.
C) render the machine useless.
D) violate Archimedes' principle.
Answer: B
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A nutritionist in the United States measures food energy in units of
A) kilocalories. B) Calories. C) both are the same D) neither of the above
A container of ideal gas at STP undergoes an isothermal expansion and its entropy changes by 3.7 J/K. How much work does it do?
A. zero
B. 
C. 
D. none of the above.
It is the day of the Summer Solstice. You notice that for you the Sun never sets. Who are you?
a) a macaw in the South American rain forest b) a penguin below the antarctic circle c) a polar bear above the arctic circle
A plane wall of thickness 2L has internal heat sources whose strength varies according to 0q is the heat generated per unit volume at the center of the wall (x = 0) and a is a constant. If both sides of the wall are maintained at a constant temperature of Tw, derive an expression for the total heat loss from the wall per unit surface area.
GIVEN
A plane wall with internal heat sources Heat source strength: q
Gcos (ax) Wall surface temperatures = Tw Wall thickness = 2L
FIND
An expression for the total heat loss per unit area (q/A)
ASSUMPTIONS
Steady state conditions prevail
The thermal conductivity of the wall (k) is constant
One dimensional conduction within the wall
SKETCH
