An ac current is given by i= 495 sin( 9.53 t, with i in milliamperes and t in milliseconds.

The frequency of the AC current is 1.51 Hz.

Explanation:

An AC current is given by :

......(1)

The general equation of AC current is given by :

.....(2)

Comparing equation (1) and (2) we get :

We know that,

So, the frequency of the AC current is 1.51 Hz.

The frequency in Hz of the AC current given by I = 495sin(9.43t) is; f = 1500.83 Hz

The current is given by;

I = 495sin(9.43t)

Now, comparing this equation to the general expression of AC Current which is;

I = A sin ωt

It means that;

A = 495

ω = 9.43 rad/ms

Now we want to find the frequency which is in Hz. Hz is simply cycles/s. Thus, let us convert ω from rad/ms to rad/s to get;

1 rad/ms = 1000 rad/s

Thus: 9.43 rad/ms = 9.43 × 1000/1

ω = 9430 rad/s

Now, we know that formula for angular velocity is;

ω = 2πf

Thus;

f = ω/2π

Plugging in the relevant values;

f = 9430/(2π)

f = 1500.83 Hz

Read more at; link

The complete question is;

An AC current is given by I = 495sin(9.43t), with I in milliamperes and t in milliseconds. Find the frequency in Hz.

i'm thinking more like energy

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.