Which of the following statements comparing halo stars to our Sun is not true?
A) Most stars in the halo have either died or are in their final stages of life, while the Sun is only in about the middle of its lifetime.
B) Most stars in the halo are less luminous than the Sun.
C) Most stars in the halo have cooler surface temperatures than the Sun.
D) Most stars in the halo contain a much lower percentage of heavy elements than the Sun.
A
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Force on a Moving Charge: A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may conclude that the magnetic field must have a component
A. downward. B. upward. C. towards the east. D. towards the west. E. towards the north.
A 14-mm tall postage stamp is 4.0 mm from a converging lens. If the image of the stamp is 4.0 mm tall, how far is it from the lens?
A) 14 mm B) 8.7 mm C) 1.4 mm D) 1.1 mm
The materials that made up the solar nebula can be categorized into the four general types as follows. Rank these materials from left to right based on their abundance in the solar nebula, from highest to lowest.
A long straight wire (diameter = 2.0 mm) carries a current of 25 A. What is the magnitude of the magnetic field 0.50 mm from the axis of the wire?
A. 5.0 mT B. 10 mT C. 0.63 mT D. 2.5 mT E. 0.01 mT