anonymous
  • anonymous
On a sunny day, a 30-m tall flag pole and its shadow form the sides of a right triangle. On this particular day, the sun rises at 6 AM and sets at 6 PM. At what time of the morning (to the nearest minute) will the length of the shadow be exactly 40 m? (Hint: determine the angle of elevation of the sun)
Mathematics
jamiebookeater
  • jamiebookeater
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xkehaulanix
  • xkehaulanix
I'm not completely sure on this one, but hopefully it's correct. \[\tan^{-1} (30/40)= \angle sun\]=36.87º The sunlight lasts for twelve hours (6 AM to 6 PM), and in that period of time it travels 180º. Therefore: 180º/12 hours= 15º per hour 36.87º/(15º per hour)=2.45799 hours This is equivalent to 2 hours + .45799 hours. 6AM+ 2 hrs + .45799 hrs = 8AM +.45799 hrs \[.45799 hrs \times 60 \min \approx 27 \min\] 8AM + 27 min= 8:27 AM
anonymous
  • anonymous
thank you :)

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