4. A chandelier brightens a ballroom after a waiter moves a switch
1 answer:
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Answer:
a) counterclockwise
Explanation:
The Lenz's Law establish that the direction of the induced current is in an opposite direction, in comparison with the change od the magnetic flux.
Specifically, if the flux decreases the induced current is in a counterclockwise direction, if increases, the direction is in a clockwise direction.
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Answer:
The rate of change of the shadow length of a person is 2.692 ft/s
Solution:
As per the question:
Height of a person, H = 20 ft
Height of a person, h = 7 ft
Rate = 5 ft/s
Now,
From Fig.1:
b = person's distance from the lamp post
a = shadow length
Also, from the similarity of the triangles, we can write:
Differentiating the above eqn w.r.t t:
Now, we know that:
Rate =
Thus