To lift a load of 100 kg a distance of 1 m an effort of 25 kg must be applied over an inclined plane of length 4 m. what must be done to lift the load 2 m, using the same effort?
a) use an inclined plane of length 8 m.
b) use an inclined plane of length 2 m.
c) use an inclined plane of length 10 m.
d) use an inclined plane of length 16 m

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A.

Explanation: To raise the load over 2 m using the same effort, an inclined plane with the same mechanical advantage as the original one should be used. So use an inclined plane of length 8 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

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causes

fossil fuels burn

cities become more industrialized

human population grows worldwide