A charge Q is uniformly distributed along the x axis from x = a to x = b. If Q = 45 nC, a = ?3.0 m, and b = 2.0 m, what is the electric potential (relative to zero at infinity) at the point, x = 8.0 m, on the x axis?
a. 71 V
b. 60 V
c. 49 V
d. 82 V
e. 150 V
c
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Lake Superior has a shoreline of length 2726 miles. What would be its diameter in km if it were a perfectly circular lake? One mile is 1.609 km.
A. 1694 km B. 1396 km C. 539 km D. 698 km E. 270 km F. 847 km
In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow), we expect the term fciv to be small if ________
A) most of the civilizations that have ever existed are still out and about in the galaxy B) primitive life is common but intelligent life is rare C) most habitable planets never actually get life on them D) most civilizations destroy themselves within just a few hundred years of arising
Of normal matter, about 25% of it by mass is still primordial helium even today
Indicate whether the statement is true or false
For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________
Fill in the blank(s) with correct word