How to Use a Laser Pointer Correctly
How to Use a Laser Pointer Correctly
Nov 5, 2010
howcast.com
A laser pointer is placed on a platform that rotates at a rate of 20 revolutions per minute. The beam hits a wall 8 m away, producing a dot of light that moves horizontally along the wall. Let θbe the angle between the beam and the line through the searchlight perpendicular to the wall (Figure 10). How fast is this dot moving when θ=(π)/(6) ? | Numerade
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