While sitting in physics class one day, you begin to ponder the workings of the analog clock on the classroom wall. You notice as the hands sweep in a continuous motion that there are exactly t = 44 minutes left in class.
Through what angle (in radians) will the second-hand turn before the end of class?

The angle turned by the second hand before the end of the class when 44 minutes are passed is;

Angle turned = 276.46 radians

We are given;

Time left for class to end; t = 44 minutes

Now, in a clock it is known that one minute equals 60 seconds and as such the second hand will perform one complete cycle for every minute passed.

Now, we know that;

1 complete cycle = 2π radians.

Thus, for each minute completed in the cycle, the second hand will have completed 2π radians.

Finally, the angle turned by the second hand before the end of the class when 't' minutes are passed is given by the formula:

Angle turned =  Angle per complete cycle × Number of minutes.

Thus;

when t = 44 minutes;

Angle turned = 2π × 44

Angle turned = 276.46 radians

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Angle turned = 276.32 radians

Explanation:

Given:

Time left for the class to end (t) = 44 min

We know that, the second hand performs one complete circle for every minute passed as 1 minute is equal to 60 seconds.

Also, one complete circle is equivalent to 360 degrees or 2π radians.

So, for every minute passed, the second hand completes 2π radians.

Therefore, the angle turned by the second hand when 't' minutes are passed is given as:

Angle turned =  Angle per rotation × Number of minutes.

Angle turned =

Plug in 3.14 for π, 44 for 't' and solve for angle turned. This gives,

Angle turned =

∴ Angle turned = 276.32 radians

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electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia