**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 tra

**nsversal 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:**