How does volcano activity connect to warning signs?
What will be an ideal response?
An earthquake puts more pressure into the vents and magma which causes it to mix with other minerals to rise faster and quicker
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A temperature change from 35°C to 55°C corresponds to what incremental change in °F?
a. 20 b. 95 c. 36 d. 131 e. 68
A Sense of Proportion: Arrange the following discoveries from earliest to most recent:
An apple weighs 1 N. When the apple is held at rest above your head, the net force on the apple is
A) 0 N. B) 0.1 N. C) 1 N. D) 9.8 N. E) none of the above
Carbon dioxide gas at 1 atmosphere pressure it to be heated from 25°C to 75°C by pumping it through a tube bank at a velocity of 4 m/s. The tubes are heated by steam condensing within them at 200°C. The tubes have 10 mm OD, are in an in–line arrangement, have a longitudinal spacing of 15 mm and a transverse spacing of 17 mm. If 13 tube rows are required, what is the average heat transfer coefficient and what is the pressure drop of the carbon dioxide?
GIVEN
• In-line tube bank: condensing steam inside, CO2 outside
• CO2 temperatures
? In: (Tg,in) = 25°C
? Out: (Tg,out) = 75°C
• CO2 velocity (Us) = 4 m/s
• Steam temperature (Ts) = 200°C
• Tube outside diameter (D) = 10 mm = 0.01 m
• Longitudinal spacing (SL) = 15 mm = 0.015 m
• Transverse spacing (ST) = 17 mm = 0.017 m
• Number of tubes (N) = 13
FIND (a) The average heat transfer coefficient (hc) (b) The CO2 pressure drop (?p)
ASSUMPTIONS
• Steady state
• The thermal resistances of the condensing steam and the tube walls are negligible (tube wall temperature = Ts)
SKETCH
