Why was Roemer's measurement of the speed of light inaccurate? a) because man's reaction time was much slower than the speed of light
b) because the eclipses of Jupiter's were not regular enough
c) he did not know the accurate diameter of the Earth's orbit

coil wire, increase current, put iron inside the coil

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.