Physics, 14.09.2019 10:30 gerardogonzale362

According to a rule-of-thumb, every five seconds between a lightning flash and the following thunder gives the distance to the flash in miles. assuming that the flash of light arrives in essentially no time at all, estimate the speed of sound in m/s from this rule. what would be the rule for kilometers?

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Answer from: tori829

speed of sound = 321 m/s

Rule of thumb for kilometers: 1 km every 3 seconds

Explanation:

Hi!

If a thunder originates at a place a distance D from you, and it takes time T for its sound to reach you, then:

$V = \frac{D}{T}$

Whre V is the speed of sound. Time T is the time elapsed between the moment you see the flash (becuase of the assumption of tha it takes no time for the light to reach you) and the moment you hear the thunder. Then

$V = \frac{1mile}{5\;s} =\frac{1609.34 \;m}{5\;s} = 321\frac{m}{s}$

To calculate the rule in kilometers:

$T = \frac{1\;km}{321*10^{-3} \frac{km}{s}} \approx 3\; s$

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Answer from: Quest

Is a vector quantity that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

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According to a rule-of-thumb, every five seconds between a lightning flash and the following thunder...