LAB : Blood Spatter – When completed, submit results by selecting “SUBMIT ASSIGNMENT” above.
Download the lab which the instructor has provided and read it
Blood spatter Lab-1.pdfActions
This week you will do calculations. Read every page of the lab and then try to carry out the calculations.
Do your best and submit your conclusion about what happened in this case on the next page.
Using the two main formulas in the lab, calculate the Area of Origin and Area of Convergence for the following case:
You are an Investigator for the State in Corrections. Two men are locked in a cell overnight. In the morning one man is dead and the other man claims he was attacked in the middle of the night by the decease, who was wielding a portion of a “broken-off” wooden mop handle. There is one area of impact on the deceased’s head. What do your calculation suggest?
Use the formulas on pages 8 and 11
Finding angle of impact
The sine of the Angle of Impact = width divided by the length.
Sine i = Width / Length of blood drop
Length of blood drops = 0.877 inch
Width of blood drop = 0.5 inches
http://www.rapidtables.com/calc/math/Arcsin_Calculator.htm (Links to an external site.)Links to an external site.
Angle of impact = ________ ?
TAN i = H/D
i = angle of impact (from above formula)
D = distance from blood drops to area of convergence, given below
H = unknown distance above target surface
Find Area of Origin
H = TAN i * D
Angle of impact = i = (from 1st calculation) in degrees
Distance to the Area of Convergence (AOC) = D = 30 inches
What does the height from the origin of the blood tell us?
If you have a documented visual impairment, please describe what factors one would need to consider to determine Area of Origin and Area of Convergence?
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