A 5-kg fish swimming at 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is
A) 1/2 m/s.
B) 2/5 m/s.
C) 5/6 m/s.
D) 6/5 m/s.
E) 1 m/s.
Answer: C
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A counterflow regenerator is used in a gas turbine power plant to preheat the air before it enters the combustor. The air leaves the compressor at a temperature of 350°C. Exhaust gas leaves the turbine at 700°C. The mass flow rates of air and gas are 5 kg/s. Take the cp of air and gas to be equal to 1.05 kJ/(kg K). Determine the required heat transfer area as a function of the regenerator effectiveness, if the overall heat transfer coefficient is 75 W/(m2 K).
GIVEN
• Counterflow air-to-gas heat exchanger
• Entering temperatures
? Ta,in = 350°C
? Tg,in = 700°C
• Mass flow rates: m a= 5 kg/s
• Specific heats: cpa = cpg = 1.05 kJ/(kg K) = 1050 J/(kg K)
• Overall heat transfer coefficient (U) = 75 W/(m2 K)
FIND
• The heat transfer area (A) as a function of the effectiveness (e)
SKETCH
Pluto is visible to the naked eye on extremely dark nights
Indicate whether the statement is true or false
Consider the circuit below. Switch S is closed at t = 0
What is the current through the capacitor
C just after the switch is closed?
The unit of electric current, the ampere, is equivalent to which of the following?
a. V/W c. W×m b. V/s d. V×W