When a comet is within the inner solar system, its visible tails point
A) away from the Sun
B) opposite the direction the comet is moving in its orbit
C) perpendicular to the ecliptic plane
D) always almost due north
E) in the direction the comet is moving in its orbit
A) away from the Sun
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Wave amplitude is related to
a. wave velocity. b. frequency. c. energy. d. wavelength.
Consider a two-component complex vector 
where a and b are real numbers. Which of the following vectors are orthogonal to this vector?
A. 
B. 
C. 
D. 
E. 
F.C and D
T. None of the above.
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
A series LC circuit contains a 100-mH inductor, a 36.0-mF capacitor and a 12-V battery. The frequency of the electromagnetic oscillations in the circuit is
A. 5.73 × 10?4 Hz. B. 9.55 × 10?3 Hz. C. 0.442 Hz. D. 2.65 Hz. E. 44.0 Hz.