What is the relation between galaxy brightness and the width of the emission lines?
The wider the H2 line the brighter the galaxy.
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A cantilever beam is loaded as shown in the figure. The bending moment at 0.5 m from the support is approximately:
(A) 12.7 kN?m
(B) 14.2 kN?m
(C) 16.1 kN?m
(D) 18.5 kN?m
A box is moved 20 m across a smooth floor by a force making a downward angle with the floor, so that there is effectively a 10 N force acting parallel to the floor in the direction of motion and a 5 N force acting perpendicular to the floor. The work done is
A. 300 J. B. 100 J. C. 200 J. D. 5.0 J. E. 20 J.
Glass in a florist's greenhouse acts as a one-way valve by
A) blocking the flow of light energy. B) blocking unwanted radiation. C) being transparent only to lower-frequency waves. D) allowing high-frequency waves to enter and blocking low-frequency waves from exiting.
If a charge generator builds a negative static charge of - how many electrons are transferred to it during this process. (e = 1.60 × 10-19 C)
A) 4.38 × 1013 B) 7.0 C) 1.12 × 10-18 D) 43.8