One of the most efficient engines built so far has the following characteristics: The combustion chamber temperature is 1900°C,
the exhaust temperature = 430°C, 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour. (1 cal = 4.186 J)
(a) What is the actual efficiency of this engine?
(b) What is the power output of this engine?
(c) What would be the maximum possible efficiency for an engine using the same temperature extremes?
(a) 48% (b) 3.9 MW (c) 68%
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A fluid at 40ºC flows at 8 m/s along a flat plate that is 3 m long. The plate is maintained at 100ºC. Determine the local convective heat transfer coefficient and the average convective heat transfer coefficient using 4 x 105 as the critical Reynolds number, for
a) Air at 100 kPa b) Water at 100 kPa
A Carnot cycle is operated in reverse as a refrigerator taking in 36. J every minute and "dumping" 40. J per minute at a room temperature of 23.°C. The net entropy increase per minute is
A) 0.13 J/°K B) 36.J/°K C) 0.15 J/°K D) zero E) 0.15 kJ/°K
Charge of uniform linear density (4.0 nC/m) is distributed along the entire x axis. Determine the magnitude of the electric field on the y axis at y = 2.5 m
a. 36 N/C b. 29 N/C c. 43 N/C d. 50 N/C e. 58 N/C
Two wave pulses pass each other on a string. The one traveling toward the right has a positive amplitude, while the one traveling toward the left has an equal amplitude in the negative direction
At the point that they occupy the same region of space at the same time A) constructive interference occurs. B) destructive interference occurs. C) a standing wave is produced. D) a traveling wave is produced. E) a wave pulse is produced.