If the ball shown in the figure lands in 0.5 s, about what height was it thrown from?

1.22 m

Explanation:

The equation of motion in this situation is:

(1)

Where:

is the final height of the ball

is the initial height of the ball

is the vertical component of the initial velocity (assuming the ball was thrown vertically and there is no horizontal velocity)

is the time at which the ball lands

is the acceleration due gravity

So, with these conditions the equation is rewritten as:

(2)

(3)

Finally:

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