Which fundamental fact about the electromagnetic force explains why electromagnetic waves exist, rather than simply electromagnetic force?
A) The electromagnetic force acts at a distance with a delay time, rather than instantaneously.
B) The electromagnetic force decreases at points more distant from the source of that force.
C) The electromagnetic force can be felt in all directions from the source of that force.
D) The electromagnetic force cannot be felt across vacuum.
E) The electromagnetic force acts instantaneously at a distance, with no delay time.
Question 2
A 5-kg fish swimming at 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the larger fish after lunch is
A) 1/2 m/s.
B) 1/5 m/s.
C) 1/6 m/s.
D) 2/3 m/s.
E) 3/2 m/s.
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