What event will eventually move an average star off the main sequence of the H-R diagram?
A) running out of hydrogen, causing gravitational influx, resulting in core temperatures high enough to begin fusing helium
B) surface cooling due to hydrogen loss
C) solar wind storms
D) its drift through space due to the gravitational attraction of neighboring giant stars
Answer: A
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The energy of a molecule can normally be divided into the following categories:
a. rotational and vibrational b. translational, rotational and vibrational c. electronic, translational, rotational, and vibrational d. rotational e. electronic
Sometimes the current in lamps is too feeble to produce glowing of the lamp filaments, which occurs when
A) too many lamps are connected in series. B) too many lamps are connected in parallel. C) too much current is drawn by the battery.
A student has written the equation below to convert a temperature in degrees Fahrenheit into Kelvins. What is wrong with this equation?
?
?
A.
.B.
should multiply (T(ºF) ? 32).C.
D.
E.
The expansion of a star to giant or supergiant size _____, and so the stars move toward the upper right in the Hertzsprung-Russell (H-R) diagram
A) contracts the star drastically B) cools the star's outer layers C) dims the star D) makes the star less luminous