A 52.5-turn circular coil of radius 5.35 cm can be oriented in any direction in a uniform magnetic field having a magnitude of 0

beer-selection.com:

5.43 x 10^-3 Nm

Explanation:

N = 52.5, radius, r = 5.35 cm = 0.0535 m, B = 0.455 T, I = 25.3 mA = 0.0253 A

Torque = N I A B Sin theta

Here, theta = 90 degree

Torque = 52.5 x 0.0253 x 3.14 x 0.0535 x 0.0535 x 0.455

Torque = 5.43 x 10^-3 Nm



beer-selection.com:

175 N to the right

Explanation:

I am taking the quiz and this is the correct beer-selection.com. The pedaling force if 250 N but when it encounters 75 N of air resistance, it reduces to 175 N. This is because the air resistance is going opposite of you.

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Based on Newton’s 3rd Law of motion, if an archer shoots an arrow at the target, the action force is the bowstring against the a

beer-selection.com: the reaction force is the arrows push against the bow sting

Explanation:the two objects must react the very same , bowstring and arrow.



Light of intensity I0 and polarized horizontally passes through three polarizes. The first and third polarizing axes are horizon

beer-selection.com:

Option C.

Explanation:

Suppose that we have light polarized in some given direction with an intensity I0, and it passes through a polarizer that has an angle θ with respect to the polarization of the light, the intensity that comes out of the polarizer will be:

I(θ) = I0*cos^2(θ)

Ok, we know that the light is polarized horizontally and comes with an intensity I0

The first polarizer axis is horizontal, then the intensity after this polarizer is:

then θ = 0°

I(0°) = I0*cos^2(0°) = I0

The intensity does not change. The axis of polarization does not change.

The second polarizer is oriented at 20° from the horizontal, then the intensity that comes out of this polarizer is:

I(20°) = I0*cos^2(20°) = I0*0.88

And the axis of polarization of the light that comes out is now 20° from the horizontal

Now the light passes through the last polarizer, which has an axis oriented horizontally, so the final intensity of the light will be:

note that here the initial polarization is I0*0.88

and the angle between the axis is 20° again.

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Then the final intensity is:

I(20°) = I0*0.88*cos^2(20°) = I0*0.78

Then the correct option is C.



beer-selection.com: the falling time

Explanation:

When a body or object falls, basically two forces act on it:

1. The force of air friction, also called "drag force"

*
:

*
(1)

Where:

*
is the drag coefficient

*
is the density of the fluid (air for example)

*
is the velocity

*
is the transversal area of the object

So, this force is proportional to the transversal area of ​​the falling element and to the square of the velocity.

2. Its weight due to the gravity force

*
:

*

(2)

Where:

*
is the mass of the object

*
is the acceleration due gravity

So, at the moment when the drag force equals the gravity force, the object will have its terminal velocity: