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Which trigonometric relationship describes the angle of impact (\(\alpha\)) of a blood drop?

Question and options

Which trigonometric relationship describes the angle of impact (α\alpha) of a blood drop?
  1. sin⁡α=w/l\sin\alpha = w/l
  2. sin⁡α=l/w\sin\alpha = l/w
  3. cos⁡α=w/l\cos\alpha = w/l
  4. tan⁡α=w/l\tan\alpha = w/l

Answer and explanation

Correct answer: A - \(\sin\alpha = w/l\)
Angle of impact: sin⁡α=width/length\sin\alpha = \text{width}/\text{length} of the elliptical stain. At 90∘90^\circ, w=lw = l and sin⁡α=1\sin\alpha = 1.

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