The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents stars with the longest main-sequence lifetimes?
A) a
B) b
C) c
D) d
E) e
D) d
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PMMA is used as a substitute for _________where fracture resistance is required.
Fill in the blank(s) with the appropriate word(s).
Spheres of Charge: A thin spherical metal shell of radius 8.0 cm carries 7.5 µC of excess charge. What is the magnitude of the electric field it produces at the following places? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) (a) at 1.0 cm above the surface(b) at 7.0 cm from the center of the sphere
What will be an ideal response?
The Doppler shift is the same if the emitting object is moving toward you at some speed, or you (the observer) are moving toward it at that speed and it is still.
Answer the following statement true (T) or false (F)
The percentage composition by mass of nitrogen dioxide is approximately
a. 43% N and 57% O. b. 33% N and 67% O. c. 30% N and 70% O. d. 47% N and 53% O.