an airplane flying at an altitude of 6KM is approaching a computer controlled radar installation at a speed of 1000 kph. when first observed, the line of sight from the radar to the air plane makes an angle of 20degrees with the horizon. assuming the plane maintains the same speed and the altitude, what is the rate of change of the angle between the ground and the line of sight to the plane.?..
can anyone show me how to interpret this problem...

Question

an airplane flying at an altitude of 6KM is approaching a computer controlled radar installation at a speed of 1000 kph. when first observed, the line of sight from the radar to the air plane makes an angle of 20degrees with the horizon. assuming the plane maintains the same speed and the altitude, what is the rate of change of the angle between the ground and the line of sight to the plane.?..    
can anyone show me how to interpret this problem...

anonymous · Answer

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anonymous · Answer

m just doing the question now, were u taught related rates?

anonymous · Answer

yes..

anonymous · Answer

attachment

anonymous · Answer

tell me if u dont understand any of that^
do u know how to do it from there?

anonymous · Answer

to evaluate the final equation, u know what theta is, and you can find x using the y value

anonymous · Answer

why did u use tan... i think its sin...

anonymous · Answer

oops, u're right

anonymous · Answer

so all that i can do now  is replace tan with sin...?

anonymous · Answer

no , i had to differentiate the tan, so do it from the start

anonymous · Answer

do it from y = x sin (theta)

anonymous · Answer

no worries