Which of the following charge distributions has the lowest electric potential at the origin? int
6
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Which are consequences of different speeds of light in different media?
A) mirages B) rainbows C) brilliant colors of diamonds D) all of the above E) none of the above
The kinetic coefficient of friction is usually larger than the static coefficient of friction
Indicate whether the statement is true or false
If the hypothesis tracing the extinction of the dinosaurs to an impact is correct, the dinosaurs died off largely because
A) of injuries suffered from direct hits of pieces of the asteroid or comet. B) radiation from iridium in the asteroid caused the dinosaurs to die of cancer. C) of global climate effects initiated by dust and smoke that entered the atmosphere after the impact. D) the impact caused massive earthquakes worldwide.
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
PROPERTIES AND CONSTANTS
the saturation temperature (Ts) of steam at 2.6 × 106 N/m2 = 225°C