What is the source of luminosity for protostars that have not yet become hot enough for fusion in their cores?
A) light absorbed from nearby stars B) energy released by infalling matter
C) fusion in their low-density outer layers D) fission from concentrated radioactive elements
B
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What is flow work?
What will be an ideal response?
Exclusion Principle: Consider the n = 10 shell.(a) What is the largest value of the angular momentum quantum number, ?, in this shell?(b) How many electrons can be placed in this shell?
Fill in the blank(s) with the appropriate word(s).
A spring is stretched from 0.500 m to 0.800 m. Assume the un-stretched position is 0.00 m. If the spring constant of the spring is 10.0 N/m, what is the work done on the spring?
A. 1.95 J B. 2.21 J C. 2.45 J D. 2.75 J E. 3.01 J
Galileo dropped two balls of different weights and found they accelerated equally to the ground below. Einstein imagined the same result for a side-by-side drop
A) without invoking gravity. B) in an accelerating vehicle. C) whether they were of the same mass or not. D) all of the above E) none of the above