The symbol indicating the number of nucleons in a nucleus is N
a. True
b. False
Indicate whether the statement is true or false
False
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Assume that the water is originally at the freezing temperature Tf, that the cooling medium inside the tube surface is just below the freezing temperature at a uniform temperature Ts, and that ho is the total heat transfer coefficient between the cooling medium and the pipe-ice interface. Also show the thermal circuit.
Show that the dimensionless equation for ice formation at the outside of a tube of radius ro is
where
GIVEN
? Water freezing on the outside of a tube
? Tube radius = ro
? Cooling medium temperature = T ? (uniform)
? Heat transfer coefficient between the cooling medium and the pipe-ice interface = ho
FIND
? Draw the thermal circuit and show that the dimensionless equation for ice formation is as shown
above
ASSUMPTIONS
? Steady state
? The thermal capacitance of the ice layer is negligible
? T? is constant
? The water is at the freezing temperature, Tf
? The properties of the ice are uniform
SKETCH
What is the magnitude of the current in the 20-? resistor?
A. 0.75 A B. 0.00 A C. 0.25 A D. 0.50 A E. 1.00 A
As material flows into a black hole
a. the material will experience time dilation. b. the material will become hotter. c. the material will produce an absorption spectrum. d. the material will appear to us to fall into the black hole very rapidly. e. a and b
A planet is much brighter than the star it orbits
a. True b. False Indicate whether the statement is true or false