When we are lucky enough to see an extra-solar planet transit its star
A) It will cause the star to vanish for several hours.
B) We can by the drop in light find the planet's size, mass, and density.
C) We can determine what elements are in its atmosphere.
D) We can determine its shape.
E) We can be certain it is a terrestrial, not a jovian.
B
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The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
A. D. B. E. C. F. D. G. E. H.
In a plane wave, the wavefronts are
a. circular. b. flat. c. parallel. d. perpendicular to the direction of propagation.
A tetherball is attached to a pole with a 2.0-m rope. It is circling at 0.20 rev/s. As the rope wraps around the pole, it shortens. How long is the rope when the ball is moving at 6.0 m/s?
a. 1.8 m c. 1.2 m b. 0.83 m d. 1.0 m
The refractive power of a lens of focal length 40 cm is
A. 4.0 D. B. 0.40 D. C. 2.5 D. D. -2.5 D. E. 0.16 D.