During a period of high solar activity, the corona:
A) disappears.
B) is more irregular.
C) cools almost to the temperature of the photosphere.
D) becomes smooth and even.
E) shrinks to half its normal size.
B
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Answer the following statement(s) true (T) or false (F)
1. The angular momentum of a particle can be nonzero even if it moves in a straight line. 2. The angular momentum (around a rotating rigid object’s center of mass) of an arbitrary particle in that object points directly along the object’s rotation axis.
Newton's second law states: sum of forces = mass × acceleration. If a known force was applied to an object with a known mass, how would you predict that object's acceleration?
A) acceleration = mass × sum of forces B) acceleration = sum of forces / mass C) acceleration = mass / sum of forces D) Newton's second law is irrelevant for solving this problem.
The higher the frequency of a wave
A. the smaller its speed. B. the greater its amplitude. C. the longer its period.
When a nucleus emits a positron, its atomic number
A) increases by 1. B) decreases by 1. C) doesn't change.