Physics, 04.08.2019 00:30 aneisha0117

During baseball practice, a batter hits a high flyball, and then runs in a straight line and catches it. which has the greater average velocity over the time interval between hit and catch?

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Answer from: yani2568

The batter and the fly ball have the same average velocity, i.e. no individual velocity is greater than the other.

Explanation:

First of all, it is worthy of note that in a baseball game, when the batter hits the ball, he is expected to immediately make a run in an attempt to catch the ball, by so doing, the batter has a greater chance of catching the ball before it hits the ground and this is exactly what the batter has done in this practice.

1. The fly ball is hit and the batter runs immediately , this means the batter and the fly ball have the same start time t.

2. The batter catches the fly ball after certain time i.e. the same end time.

3. The batter runs in a straight line to catch the ball i.e. the displacement of both batter and fly ball from hit point to catch point is the same.

MATHEMATICALLY

$D_{batter} = D_{fly ball}$

$t_{batter} = t_{fly ball}$

Where D = Displacement and t = time

Average velocity $V = \frac{D}{t}$

Where $D_{batter} = D_{fly ball}$

and

$t_{batter} = t_{fly ball}$

This means $V_{batter} = V_{fly ball}$

Answer from: Quest

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

Answer from: Quest

snell's law

refractve index = sin incidence / sin refraction

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