Propanol (C3H8O) is boiled in a container at 101 kPa and where the surface temperature is 120ºC. Its saturation temperature is 97.4ºC and its heat of fusion is 697 kJ/kg. Estimate the heat transfer per unit area.
What will be an ideal response?
Using Mathcad:
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A resistor is connected to an ideal ac power supply. (a) The phase angle between the current and voltage is
A) 0 B) ?/2 radians. C) -?/2 radians. D) ? radians. E) 3?/4 radians. (b) The current in the resistor A) leads the voltage across the resistor by 90°. B) lags the voltage across the resistor by 90°. C) is in phase with the voltage across the resistor. D) the voltage across the resistor by 45°. E) lags the voltage across the resistor by 45°. (c) How does the average power dissipated in the resistor change as the frequency in the ac power supply decreases? A) It decreases. B) It increases. C) It does not change. D) It increases or decreases depending on the sign of the phase angle. What will be an ideal response?
What does the equivalent of an H-R diagram for galaxies, plotting luminosity versus color, show?
A) galaxies fill the diagram showing that there is no correlation between luminosity and color B) two clumps, one blue with relatively low luminosity, one red with relatively high luminosity, and a valley in between with few galaxies C) a continuum from faint, blue galaxies to bright, red galaxies D) a continuum from faint, red galaxies to bright, blue galaxies E) a main sequence, just as for stars
The magnetic field amplitude in an electromagnetic wave in vacuum is related to the electric field amplitude by B =
A.
.B.
.C.
D.
.E.
Answer the following statement(s) true (T) or false (F)
1. Suppose we create a traveling compression wave in a spring that has one end fixed. When the wave reflects from the fixed end, it will be inverted (that is, compression will become rarefaction and vice versa). 2. Suppose you are near one end of a 150-m-long cylindrical tunnel open to the air on both ends. If you give a shout, you might hear an echo.