In 1939, joe sprinz of the san francisco baseball club attempted to break the record for catching a baseball dropped from the greatest height. members of the cleveland indians had set the record the preceding year when they caught baseballs dropped about 210 m from atop a building. sprinz used a blimp at 240 m. neglect the effects of air on the ball and assume that the ball free falls that distance. key idea assuming that we can neglect the effects of the air, once the ball leaves the blimp and before it is caught, its acceleration is the free-fall acceleration ag. because this acceleration is constant, the constant-acceleration equations apply to the motion. here we will use the symbol y instead ofx, and in the calculations we will substitute-g for a. in terms of the ball's displacement y - yo and its acceleration -g, and setting the initial velocity vo to 0 (the ball is released, not thrown upward or downward), what is the ball's time of fall?

answer: i pick a

explanation:

explanation:

the masses of the objects and the distance between them

3.2x10^7

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