Atourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.8 m/s. the car is a distance d away. the bear is 22 m behind the tourist and running at 6.3 m/s. the tourist reaches the car safely. what is the maximum possible value for d?

The maximum possible value for d is 33.4 m.

The bear chases the tourist with a speed v₁ and the tourist runs with a speed v₂. The distance between the tourist and the car is d and the distance between the tourist and the bear is 22 m. for the tourist to reach the car safely, he should cover the distance d in the same time as the bear, which covers a distance d+22 m.

Therefore,

Substitute 3.8m/s for v₂ and 6.3 m/s for v₁. Solve for d.

The maximum distance between the tourist and his car, for him to be safe from the chasing bear is 33.4 m.

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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