Calculate the magnitude of the flux of a constant electric field of 5.00 n/c in the z-direction through a rectangle with area 4.00 m2 in the xy-plane. (a) 0 (b) 10.0 n m2/c (c) 20.0 n m2/c (d) more information is needed

The magnitude of the flux is  

Explanation:

The electric flux through a planar area is defined as the product of electric field and the  component of the area perpendicular to the field.

Electric flux = Electric field * Area * (angle between the planar area and the electric flux)

The equation is

Where:

is the Electric Flux

A is the  Area

E is the Electric field

is  angle between a perpendicular vector to the area and the electric field

Now substituting the values,

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.