Rodriquez Parry
06/27/2024 · High School
A searchlight rotates at a rate of 4 revolutions per minute. A straight road leads from the searchlight to a wall 7 miles away, perpendicular to the wall. The searchlight beam hits the wall and produces a dot of light that moves along the wall. How fast (in miles per hour) is this dot moving when the angle \( \theta \) between the beam and the road is \( \frac{\pi}{3} \) ? Note that \( d \theta / d t=4(2 \pi)=8 \pi \). Velocity of dot =
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The speed of the dot of light is approximately \( 13440\pi \) miles per hour, or about 42281.6 miles per hour.
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