When electric current is flowing in a metal, the electrons are moving.A. at nearly the speed of lightB. at the speed of lightC.
2 answers:
Answer:
E. at none of the above speeds
Explanation:
When current flowing through the metal then the speed of electrons in metal is not very high.
This speed of all electrons inside metal is opposite the the electric field which is due to the applied potential difference on the metal by external battery.
As we know that
here for the current flowing in the metal the all the free electrons will move at drift speed which is given as
here speed of electrons will be
= drift speed
n = number density of electrons
A = crossectional area
e = charge of an electron
in general this speed is very small and approximately of order cm/s
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Answer:
10 seconds.
Explanation:
We can use a kinematic equation where we know the final velocity, initial velocity, acceleration, and need to determine the time <em>t: </em>
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The initial velocit is 30 m/s, the final velocity is 0 m/s (as we stopped), and the acceleration is -3 m/s².
Substitute and solve for <em>t: </em>
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Hence, it will take the car 10 seconds to come to a stop.