A system of two cylinders fixed to each other is free to rotate about a frictionless axis through the common center of the cylinders and perpendicular to the page. A rope wrapped around the cylinder of radius 2.50 m exerts a force of 4.49 N to the right on the cylinder. A rope wrapped around the cylinder of radius 1.14 m exerts a force of 9.13 N downward on the cylinder. What is the magnitude of the net torque acting on the cylinders about the rotation axis? Answer in three decimal places.

Explanation:

Because torque is a vector quantity , the direction of torque is considered along the axis of rotation .

In first case force is applied in the right direction , thus the torque will be in upwards direction .

The magnitude of torque is = force x perpendicular distance between point of application of force and axis of rotation .

Thus in this case τ₁ = 4.49 x 2.50 = 11.25 N-m

Similarly , torque on second cylinder τ₂ = 91.3 x 1.14 = 104.08 N-m

Here force is applied downwards direction , thus the direction of torque is in the plane of page .

The torque is a vector quantity . The net torque can be found

τ = =  331.402 N-m

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

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