posted by Anonymous .
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.
Divide the distance by the time. That is how you get velocity.
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)*
In an electric motor, at the moment that the half-turn of the rotor (central electromagnet) completes, the field of this electromagnet