The sun is on the celestial equator at the times of the
a. vernal equinox and the summer solstice.
b. autumnal equinox and the vernal equinox.
c. summer solstice and the winter solstice.
d. autumnal equinox and the winter solstice.
e. sun is on the ecliptic and is never on the celestial equator.
B
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The mass of a visual binary pair of stars can be obtained from
a. the time in years for them to orbit one another. b. the size of their orbit. c. their apparent magnitudes. d. both the time in years for them to orbit one another and the size of their orbit.
General Questions: A fireman is sliding down a fire pole. As he speeds up, he tightens his grip on the pole, thus increasing the vertical frictional force that the pole exerts on the fireman. When the force on his hands equals his weight, what happens to the fireman?
A. The fireman comes to a stop. B. The fireman descends with slower and slower speed. C. The fireman descends with a smaller but non-zero acceleration. D. The fireman continues to descend, but with constant speed. E. The acceleration of the fireman is now upward.
For laminar flow in a circular tube, the velocity is given by
The induced electric and magnetic fields of Maxwell are
A) parallel to each other. B) perpendicular to each other. C) non-directional.