When the egyptians noticed this celestial body rising before the sun it indicated to them the coming of the nile flood.

when the ancient egyptians noticed the rising of sirius (brightest start on the night sky) before the sun it indicated to them the coming of the nile flood.

Explanation:

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

96.77 amp

explanation:

rl = 250/100 = 2.5 ohms.

egl = 250 + (100 × 0.1) + 2 = 262 v.

at 700 r.p.m., eg2 = 262 × 700/1000 = 183.4 v.

if ia is the new current, then eg2 - 2 - (ia × 0.1) = 2.5 ia

which means this will give ia = 96.77 amp.