Which of the following statements about Betelgeuse is not true?
A) It is distinctly red in color.
B) We now know that it is a very massive star near the end of its life.
C) Its Arabic name means "the demon star."
D) It is one star of the three stars of the Winter Triangle, along with Procyon and Sirius.
E) It is the upper left shoulder star of the constellation Orion.
C
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Determine the difference equations applicable to the centerline and at the surface of an axisymmetric cylindrical geometry with volumetric heat generation and convection boundary condition. Assume steady-state conditions.
GIVEN
Axisymmetric, steady, cylindrical geometry with volumetric heat generation and surface
convection boundary condition
FIND
(a) Difference equations for the centerline and surface
SKETCH
You can hear sound through an open window from sources that are not in your line of sight because of diffraction
Indicate whether the statement is true or false
Motional Emf: A long vertical wire carries a steady 70 A current. As shown in the figure, a pair of horizontal rails are 0.20 m apart. A 20-? resistor connects points a and b, at the end of the rails. A bar is in contact with the rails, and is moved by an external force with a constant horizontal velocity of 0.90 m/s to the right, as shown. The bar and the rails have negligible resistance. At the instant that the bar is 0.20 m from the wire, what are the induced current in the resistor and its direction through the resistor? (?0 = 4? × 10-7 T ? m/A)
A. 0.63 ?A, from a to b B. 0.63 ?A, from b to a C. 0.32 ?A, from a to b D. 0.32 ?A, from b to a E. 1.9 ?A, from b to a
A uniform rod (length = 2.0 m) is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through the rod at a point 0.50 m from one end of the rod. If the rod is released from rest in a horizontal position, what is the angular speed of the rod as it rotates through its lowest position?
A. 3.5 rad/s B. 3.8 rad/s C. 4.1 rad/s D. 2.0 rad/s E. 5.6 rad/s