The electric-power industry is interested in finding a way to store electric energy during times of low demand for use during peak-demand times. one way of achieving this goal isto use large inductors. a)what inductance l would be needed to store energy e = 3.0 kwh (kilowatt-hours) in a coil carrying current i = 300a?

240 H

Explanation:

The energy stored in an inductor is given by:

where

L is the inductance of the inductor

I is the current

In this problem, we know:

is the current in the inductor

is the energy stored. We need to convert it into Joules:

So, we can now solve the equation to find L, the inductance:

answer

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explanation:

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.