Common static electricity involves charges ranging from nanocoulombs to microcoulombs. (a) How many electrons are needed to form a charge of −7.50 nC? electrons (b) How many electrons must be removed from a neutral object to leave a net charge of 0.580 µC? electrons

a) 4.681*10^10 electrons

b) 3.67*10^12 electrons

Explanation:

The amount of electrons in a charge of 1C is:

You use the previous equality as a conversion factor.

a) The sing of the charge is not important in the calculation of the number electrons, so, you use the absolute value of the charge

In 7.50nC there are 4.61*10^18 electrons

b)

To obtain a charge of  0.580 µC in a neutral object you need to take out 3.67*10^12 electrons

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

harry byrd declared organized resistance by southern states would prevent racial integration.