The process of leveling of the Earth by the wearing away of high places and the transportation to and deposition of sediments at lower levels is called
a. gradation.
b. weathering.
c. erosion.
d. none of the above.
a
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The star named Circini has the spectral type and luminosity class of O 8.5 V. Based on this information, which of the following are true? I. Circini has a surface temperature less than the sun. II. Circini has a diameter that is greater than that of the sun. III. Circini is more luminous than the sun. IV. Circini is located near the upper left hand corner in the HR diagram
a. I & II b. II & IV c. II, III, & IV d. I, II, & III e. I, II, III, & IV
Answer the following statement(s) true (T) or false (F)
1. Suppose we create a traveling compression wave in a spring that has one end fixed. When the wave reflects from the fixed end, it will be inverted (that is, compression will become rarefaction and vice versa). 2. Suppose you are near one end of a 150-m-long cylindrical tunnel open to the air on both ends. If you give a shout, you might hear an echo.
Which two planets are known as ice giants?
A. Earth and Mars B. Jupiter and Saturn C. Uranus and Neptune D. Pluto and Charon
Suppose we take a disk of radius R and remove the material from r = R outward. Note that this decreases both the disk’s mass and its radius. Will the value of ? for the new object be larger, smaller, or the same as that for the original object?
A. The value of ? will be larger for the new object. B. The value of ? will be smaller for the new object. C. The value of ? is the same for both objects. D. We need to know the disk’s thickness to answer.