Which of the following discoveries, if they existed, would necessitate a reevaluation of our ideas of stellar formation?
A) a cluster of stars that appeared to be 13 billion years old
B) a 100-solar-mass star
C) a 0.01-solar-mass star
D) a molecular cloud without any stars
E) planetary systems around other stars than our own
C
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Which of the following is possessed by a moving object, but not by a stationary object?
A. Mass B. Kinetic energy C. Energy D. Inertia
Identify (name) the 12 leptons:
What will be an ideal response?
The photosphere is the coolest layer close to the Sun, for the radiation of visible light allows it to cool off efficiently
Indicate whether the statement is true or false
For a person with normal vision (near point 25 cm, far point infinity), the maximum angular magnification for a lens is 4.00. If this same lens is used with the relaxed eye, what angular magnification would result?
1.The focal length must be given to figure this out. 2.5.00 3.3.50 4.3.00