A certain gas is compressed adiabatically. The amount of work done on the gas is 800 J. What is the change in the internal (thermal) energy of the gas?
A) 800 J
B) -800 J
C) 400 J
D) 0 J
E) More information is needed to answer this question.
A
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Atmospheric air at a velocity of 61 m/s and a temperature of 16°C enters a 0.61-m-long square metal duct of 20 × 20 cm cross section. If the duct wall is at 149°C, determine the average heat transfer coefficient. Comment briefly on the L/Dh effect.
GIVEN
Atmospheric air flow through a square metal duct
Air velocity (V) = 61 m/s
Inlet air temperature (Tb,in) = 16°C
Duct dimensions: 20 cm × 10 cm × 0.61 m = 0.2 m × 0.2 m × 0.61 m
Duct wall surface temperature (Ts) = 149°C
FIND
The average heat transfer coefficient (c h)
ASSUMPTIONS
Steady state
Constant and uniform wall surface temperature
SKETCH
When an object reaches its terminal speed, its acceleration is zero
Indicate whether the statement is true or false
Resistors in Combination: A 2.0-? resistor is in series with a parallel combination of 4.0-?, 6.0-?, and 12-? resistors. What is the equivalent resistance of this system?
A. 24 ? B. 4.0 ? C. 1.8 ? D. 2.7 ?
Power is transmitted at high voltages because the corresponding current in the wires is
A) also high to deliver appreciable power to distant places. B) low so that overheating of the wires is minimized. C) either of these D) neither of these