The mass of a newly formed star will determine its position on the main sequence
Indicate whether the statement is true or false
TRUE
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The choices describe four hypothetical planets. Which one would you expect to have the hottest interior? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)
A) Size: twice as big as Earth Distance from Sun: same as Mercury Rotation rate: once every 6 months B) Size: same as the Moon Distance from Sun: same as Mars Rotation rate: once every 10 days C) Size: same as Mars Distance from Sun: same as Earth Rotation rate: once every 18 hours D) Size: same as Venus Distance from Sun: same as Mars Rotation rate: once every 25 hours
The intricate patterns visible in an X-ray image of the Sun generally show
A) helioseismological fluctuations. B) a bubbling pattern on the photosphere. C) extremely hot plasma flowing along magnetic field lines. D) structure within sunspots.
An important condition for the operation of the Falkirk Wheel is that
A) water in each caisson have the same depth. B) ships carried are more or less equal in weight. C) no water spill when a ship enters a caisson. D) all of the above E) none of the above
A magician can make a candle look as if it is burning under water by focusing light from a candle flame burning in air directly on top of an underwater candle. To do this you want to use a (Hint: eliminate those that cannot work.)
A. concave mirror farther than one focal length from the burning candle. B. a convex mirror farther than one focal length from the burning candle. C. a biconcave lens farther than one focal length from the burning candle. D. a concave mirror closer than one focal length to the burning candle. E. a convex lens closer than one focal length to the burning candle.