Juanita studies several free-body diagrams in which a normal force is shown. what is always true about a normal force in a free-body diagram?
a. it is opposite the weight.
b. it is perpendicular to a surface.
c. it is opposite the net force.
d. it is parallel to a surface.

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

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