Giant and supergiant stars are rare because
a. they do not form as often as main-sequence stars.
b. the star blows up before the giant or supergiant stage is reached
c. the giant or supergiant stage is very short.
d. the giant or supergiant stage is very long
c
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The ____ is the nuclear fusion of three helium nuclei to form a carbon nucleus
a. proton-proton chain b. Carbon-Nitrogen-Oxygen cycle (CNO cycle) c. triple-alpha process d. Coulomb barrier e. infrared cirrus
Series/Parallel Circuits: A 4.0-? resistor is connected with a 12-? resistor and this combination is connected across an ideal dc power supply with V = 6.0 V, as shown in the figure. When a total current I flows from the power supply, what is the current through the 12-? resistor?
A. 1.5 A B. 2.0 A C. 2.5 A D. 3.0 A E. 0.50 A
What are the mechanisms that restrict the mass range of stars to about 0.1 to 100 solar masses?
What will be an ideal response?
A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz. What is the maximum speed of the needle?
A) 3.18 cm/s B) 4.51 cm/s C) 20.3 cm/s D) 10.1 cm/s E) 6.36 cm/s