Agood baseball pitcher can throw a baseball toward home plate at 83 mi/h with a spin of 1700 rev/min. how many revolutions does the baseball make on its way to home plate? for simplicity, assume that the 60 ft trajectory is a straight line.

you have to draw the persons position over there

power out to power in less than 100%

d) physical means can be used to separate the components of air.

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