One energy source for brown dwarfs is:
A) hydrogen fusing to helium.
B) helium fusing to carbon.
C) iron core collapse.
D) helium-3 fusing to helium-4.
E) deuterium fusing to helium-3.
E
You might also like to view...
What kind of spectra is shown above?
a. continuous
b. blackbody
c. emission
d. absorption
A liter is equivalent to 33.8 fluid ounces. How many liters of gasoline are required to fill a 21 gallon gas tank, if 1 gallon is equivalent to 128 fluid ounces?
A. 210 liters B. 710 liters C. 80 liters D. 6 liters
Cal is viewing the Moon with his new telescope, using a 10-mm focal length eyepiece. For greater detail, he wishes to double the magnification of his telescope
An eyepiece having which one of the following characteristics will accomplish this for him? A) 40 diopters B) 8 mm C) 12 mm D) 200 diopters E) 5 diopters
A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2 . What is the time interval required for it to reach a 10-rad displacement after starting from rest?
a. 28 s c. 56 s b. 2.0 s d. 18 s