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At 25°C, sound can travel 100 meters across a football field in 0.29 seconds. Determine the velocity of these sound waves in the direction they travel across the field.

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    Divide the distance by the time. That is how you get velocity.

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    Given: t (time): 0.29s (2 sig figs)*
    d (distance): 100m

    v = d / t
    v = 100m / 0.29s
    v = 340 m/s (remember two sig figs)*

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    In an electric motor, at the moment that the half-turn of the rotor (central electromagnet) completes, the field of this electromagnet

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