Elements above hydrogen and helium come from _____
a. the early stages of the Universe, before the formation of stars and galaxies
b. the collision of neutron stars and black holes
c. cooling and accretion of molecules in dense molecular clouds
d. the last phases of stellar evolution and stellar "death"
e. matter falling into supermassive black holes
d
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A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 ? and C = 300 ?F. The power factor, cos ?, is
a. ?1.00. b. ?0.749. c. +0.749. d. +0.834. e. +1.00.
Kirchhoff's Rules: For the circuit shown in the figure, write the Kirchhoff loop equation for the entire outside loop. Notice the directions of the currents!
What will be an ideal response?
This diagram represents a star with an orbiting planet that, as seen from Earth, periodically transits across the face of the star and disappears behind the star. If you measure the brightness of this system, at which point would it be brightest?
A) Point 1 B) Point 2 C) Point 3 D) Point 4
When a low-mass star runs out of hydrogen in its core, it gets brighter. Why?
What will be an ideal response?