What is the typical main sequence lifetime of a G-type star?
A) 10 million years
B) 100 million years
C) 1 billion years
D) 10 billion years
E) 100 billion years
D
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What is the maximum value of the magnetic field at a distance of 2.5 m from a light bulb that radiates 100 W of single-frequency sinusoidal electromagnetic waves uniformly in all directions?
(?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s) A) 0.10 ?T B) 0.40 ?T C) 0.50 ?T D) 0.60 ?T E) 0.80 ?T
If a source of sound is traveling toward you, the speed of the sound waves reaching you is _______________ the speed the sound waves would have had if the source were stationary
a. faster than b. slower than c. the same as
Why was Voyager 2 an extremely efficient and productive probe?
What will be an ideal response?
Imagine that we have two isolated metal spheres. The one on the left has a negative charge, while the one on the right has a positive charge. If these spheres are connected with a straight metal wire, what direction does the conventional current flow?
A. Left to right B. Right to left C. Because there is no electric field, no current flows. D. The direction depends on the spheres’ relative sizes.