The International Space Station has a mass of 1.8 × 105 kg. A 70.0-kg astronaut inside the station pushes off one wall of the station so she accelerates at 1.50 m/s2
What is the magnitude of the acceleration of the space station as the astronaut is pushing off the wall? Give your answer relative to an observer who is space walking and therefore does not accelerate with the space station due to the push.
A) 5.8 × 10-4 m/s2
B) 1.50 m/s2
C) 4.7 × 10-4 m/s2
D) zero
E) 3.9 × 10-3 m/s2
Answer: A
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A steam-heated single-pass tubular preheater is designed to raise 5.6 kg/s of air from 200C to 75°C, using saturated steam at 2.6 MPa(abs). It is proposed to double the flow rate of air and, in order to be able to use the same heat exchanger and achieve the desired temperature rise, it is proposed to increase the steam pressure. Calculate the steam pressure necessary for the new conditions and comment on the design characteristics of the new arrangement.
GIVEN
• Steam-heated single-pass tubular preheated heating air
• Air flow rate ( m a)= 5.6 kg/s
• Air temperature
? Ta,in = 20°C
? Ta,out = 75°C
• Saturated steam pressure (ps) = 2.6 MPa = 2.6 × 106 N/m2
FIND
• The steam pressure necessary for a double m a with the same temperature rise
SKETCH
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the saturation temperature (Ts) of steam at 2.6 × 106 N/m2 = 225°C
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