A solar eclipse that occurs when the moon's umbra does not reach Earth's surface is called
a. a total solar eclipse.
b. a partial solar eclipse.
c. an annular solar eclipse.
d. a penumbral solar eclipse.
e. an umbral solar eclipse.
C
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The Sun's atmosphere consists of the ________ and the ________.
A. chromosphere; corona B. photosphere; chromosphere C. photosphere; corona D. corona; solar wind
Water pressurized to 3.5 × 105 Pa is flowing at 5.0 m/s in a horizontal pipe which contracts to 1/3 its former area. What are the pressure and velocity of the water after the contraction?
A. 2.5 × 105 Pa, 15 m/s B. 3.0 × 105 Pa, 10 m/s C. 3.0 × 105 Pa, 15 m/s D. 4.5 × 105 Pa, 1.5 m/s E. 5.5 × 105 Pa, 1.5 m/s
Which statement about gamma ray bursters is NOT correct?
A) Millisecond flickering implies they are tiny in size. B) In seconds, they radiate enormous amounts of energy. C) They seem to be coming from far beyond our own Milky Way. D) They are scaled up X-ray bursters, with more massive objects involved. E) The beams may be bipolar ejections from the hypernova formation of black holes.
The radius of Earth is about __________ mi
a. 6000 b. 8000 c. 4000 d. 2000