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OpenStudy (anonymous):
a searchlight is mounted at the front of a helicopter flying 125m abve ground. the angle of depression of thr light beam is 70 dgree with the ground. an observer on the ground notices that the beam of light measures 5 dgree. how wide, to the nearest meter is the spot on the ground?
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OpenStudy (anonymous):
|dw:1385008340743:dw|
OpenStudy (anonymous):
|dw:1385008463293:dw|
OpenStudy (anonymous):
|dw:1385008504256:dw|
OpenStudy (anonymous):
tan(2.5)=(w/2)/125 tan(2.5)=w/250 w=tan(2.5)*250
OpenStudy (dumbcow):
there is problem, triangl must add up to 180 degrees - the 70 is not the angle of elevation of light but angle of depression of flashlight
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OpenStudy (dumbcow):
|dw:1385009355907:dw|
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