Agymnast jumps straight up, with her center of mass moving at 4.73 m/s as she leaves the ground. how high above this point is her center of mass at the following times? (ignore the effects of air resistance, and assume the initial height of her center of mass is at y = 0.)

At any time t, her altitud will be given by the following law:

Explanation:

We can consider the gymnast as a point particle in the position of her center of mass. The law of movement will be:

where g is gravity's acceleration which we can take as . We add 0 in the last member just to note that at the vertical position is 0. If we knew that she was moving at at , we would have needed to put 1m in the place of 0.

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