What is the primary way in which high-mass stars recycle material into the interstellar medium?
A) through stellar winds and supernova explosions
B) through the formation of planetary nebulae
C) through protostar formation
D) through stellar winds alone
A) through stellar winds and supernova explosions
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A parallel plate capacitor with an air dielectric is attached to a voltage source and charged. The voltage source is removed, and then the plates are separated to double their previous distance. What happens to the electric field between the plates when they are separated?
A. it doubles B. it quadruples C. it halves D. it is diminished by a factor of 4 E. it stays the same
If you add two vectors with magnitudes of 200 and 40, which of the following is the only possible resultant?
A. 100 B. 260 C. 0 D. 200 E. 40
In choosing between sound waves and radio waves, which has the greater speed?
A) sound wave B) radio wave C) both the same D) need more information
The greenhouse effect is occurring because
a. the ozone layer is being depleted. b. the amount of carbon dioxide in the atmosphere is increasing. c. the ionosphere reflects low frequency radiation. d. more ultraviolet radiation is penetrating the atmosphere. e. none of the above.