6. Calculate the electrostatic force for two charges qı = 4 uC , q2 = 5 uC, and d between
them r = 0.4 cm. Make sure you use meter as the unit for distance unit.

Any one please I will gladly appreciate it.

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

The place you get your hair cut has two nearly parallel mirrors 6.00 m apart. as you sit in the chair, your head is 2.00 m from the nearer mirror. looking toward this mirror, you first see your face and then, farther away, the back of your head. (the mirrors need to be slightly nonparallel for you to be able to see the back of your head, but you can treat them as parallel in this problem.) how far away does the back of your head appear to be?

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?