8. Rubbing a plastic bag and a balloon with a cloth gives both objects a net negative charge. The balloon's
charge is -1x10^-10 C and the bag's charge is -1x10^-5 C, and each object has a mass of 0.02 grams.
Wearing insulating gloves, you hold the bag above the balloon and let go. How far above the center of the
balloon will the bag 'levitate'?

0.214 m

Explanation:

In order for the bag to levitate and not fall down, the electrostatic force between the bag and the balloon must balance the weight of the bag.

Therefore, we can write:

where

k is the Coulomb constant

is the charge on the balloon

is the charge on the bag

r is the separation betwen the bag and the balloon

is the mass of the bag

is the acceleration due to gravity

Solving for r, we find the distance at which the bag must be held:

answer:   you might love summer weather, but you don’t want it to feel like the sun is inside your car. but a hot car that just won’t seem to cool down might be a bigger of a problem than you think. your car relies on being at the right temperature.

explanation: