A metal sphere with .004C of charge is touched to an identical neutral metal sphere. The spheres are then placed 1.5m away
from each other. What is the Electrostatic force that they feel,
and is it attraction or repulsion?

8. why do radio telescopes convert radio waves (analog signals) to electrical (digital) signals for analysis? (hint: what did the article say about the advantages of digital signals? )

Which of the following represents an upright image? a. -do b. +m c. -m d. +do

An object is 10. cm from the mirror, its height is 3.0 cm, and the focal length is 2.0 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1.33 -1.33 +0.75 -0.75