To what radius would the Sun have to be condensed in order for it to become a black hole? The mass of the Sun is 1.99 × 1030 kg and G = 6.67 × 10-11 Nm2/kg2
A) 2950 m
B) 1470 m
C) 6.96 × 108 m
D) 2.66 × 106 m
E) 3.72 × 104 m
A
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What distinguishes the spectral type of a star?
A. the lines in its spectrum B. its brightness C. its distance D. its velocity
The materials that compose most of Titan are completely different than those that compose Earth. Therefore, what were scientist surprised to see from space-probe images in a 2005 landing?
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A ball rolls across a floor with an acceleration of 0.100 m/s2 in a direction opposite to its velocity. The ball has a velocity of 4.00 m/s after rolling a distance 6.00 m across the floor. What was the initial speed of the ball?
A) 4.15 m/s B) 5.85 m/s C) 4.60 m/s D) 5.21 m/s E) 3.85 m/s
Spicules
a. are found in the photosphere. b. are magnetic disturbances that push large loops of material off the solar surface. c. are responsible for twisting the solar magnetic field and causing the sunspot cycle. d. appear in the corona near the north and south poles of the Sun during a total solar eclipse. e. are visible in filtergrams of the solar chromosphere.