Two tuning forks sounding together result in a beat frequency of 3 Hz. If the frequency of one of the forks is 512 Hz, what is the frequency of the other?
a. 509 Hz or 515 Hz
c. 518 Hz or 506 Hz
b. 105 Hz
d. 85 Hz
A
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A vertical rectangular water duct 1-m-high and 0.1-m-deep shown in the sketch is placed in an environment of saturated steam at atmospheric pressure. If the outer surface of the duct is about 50°C, estimate the rate of steam condensation per unit length.
GIVEN
? Water-cooled rectangular duct, 1-m-high, 0.1-m-deep
? Duct surface is 50°C
? Steam environment
FIND
(a) Rate of steam condensation per unit length of the duct
ASSUMPTIONS
? The steam is at 1 atmosphere pressure
? Condensation from the horizontal duct surfaces can be neglected
? Laminar film condensation on the vertical surfaces (must be checked)
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, the properties of saturated liquid at the mean temperature of 75°C are
From Appendix 2, Table 35, the properties of the saturated vapor at the saturation temperature of 100°C are
Which of the following best describes the evolutionary track followed on the H-R diagram for the most massive stars?
A) vertically upward, along the left edge of the diagram B) diagonally to lower right, then vertical, then horizontally left C) horizontally right, diagonally to lower left, then horizontally right D) horizontally right E) horizontally right, then forms a clockwise loop
In the difference A - B - C, A is accurate to 5 decimal places, B is accurate to 2 decimal places, and C is accurate to 3 decimal places. What is the correct number of decimal places in the difference?
A) 2 B) 3 C) 4 D) 5 E) 0
As viewed from Earth, in which zodiac constellation does the Sun appear to be located on April 21?
A) Leo B) Aquarius C) Libra D) Aries