Why are there the 3 kinds of AC power?
1 answer:
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Explanation:
Relation between work and change in kinetic energy is as follows.
Also,
= J
= J
Let us assume that electric force on the electron has a magnitude F. The electron moves at a distance of 0.3 m opposite to the direction of the force so that work done is as follows.
w = -Fd
F =
Therefore, relation between electric field and force is as follows.
E =
=
= C
Thus, we can conclude that magnitude of the electric field that will stop these electrons in a distance of 0.3 m is C.
Answer:
D) 11 m/s
Explanation:
We have to calculate the velocity of the hot dog with respect to the observer still outside the train. This velocity will be given by:
where
is the velocity of the train (towards right)
is the velocity of the man (towards right)
is the velocity of the hot-dog (towards left, so we put a negative sign)
By replacing the numbers into the equation, we find
and the positive sign means the velocity is toward right.