Consider a football halfback with a mass of 90 kg running down the football field and encountering a collision with a defensive back. If the halfback experiences a force of 800 N for 0.9 seconds, how much impulse will he experience?

Impulse:

Explanation:

The impulse experienced by an object is given by:

Where

F is the magnitude of the force exerted on the object

is the time interval during which the force is applied

I is the impulse

For the halfback in this problem, we have:

F = 800 N is the force experienced

is the time interval

Therefore, the impulse experienced is

And this impulse is also equal to the change in momentum of the halfback.

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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