is there anyone out there that can help

Question

I am assuming when looking to find out the degree of impact of a stain you divide the width by the length for instance 7.2 mm/14.4mm = .50 but how do you than determine the degree?

 

The second part is finding the height of origin using the tangent function. For instance once the degree is determined from the above part how is the height which is unknown determined, but you know the distance from point of convergence is 37.5 inches. HELP!!!

Answer 1

These questions are ridiculous, and it smells like someone is trying to pull tutor's legs. There is NO PHYSICAL REASON for a stain's length/width ratio to translate simply to the angle of splatter -- where the horizontal distance from droplet release to stain and height of release determine the angle.

 

As an extreme case, a blood droplet dropped vertically, where D is 0 and H is some finite number and tan (H/D) tends to infinity, will be circular.

 

A blood droplet traveling horizontally at some speed x will leave a stain more and more lengthened the higher x is. Will these stains be ellipsoidal? I don't think it's even that "simple." The stain will probably look more like the coma of a comet, with a large head tailing off to nothingness at the trailing end of the stain.

 

People. Please. NO MORE BLOOD STAIN QUESTIONS. They are unanswerable if only given the intuitively obvious equation that the angle of splatter is (approximated by) tan (H/D), and you're given the width and length of the blood stain.

 

Consult a psychic is my best advice, given no further information.

Answer 2

You have a right triangle:

 

Length L = hypotenuse

width w = horizontal leg

height h = vertical leg

θ = angle between L and w

 

 

You find the angle θ in terms of L and w  using cos^-1(w/L).

 

Once your θ is found, find the height using  wtanθ.