A man on the 14 th floor of a building sees a bucket (dropped by a window washer) passing his window and notes that it hits the ground 1 second later. Assuming a floor is 4.9 meters high (and neglecting air friction), from what floor was the bucket dropped?

The bucket was the dropped from 56 th floor.

Explanation:

Given that,

Height of floor = 4.9 m

Height of 14 floor = 68.6 m

Time taken = 1 sec

We need to calculate the speed of the bucket

Using equation of motion

Put the value into the formula

We need to calculate the time

Using equation of motion

Put the value into the formula

We need to calculate the distance

Using equation of motion

Put the value into the formula

We need to calculate the number of floor

Put the value into the formula

The bucket was the dropped from

Hence, The bucket was the dropped from 56 th floor.

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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