A small glass ball rubbed with silk gains a charge of +2.0 μC. The glass ball is placed 12 cm from a small charged rubber ball that carries a charge of −3.5 μC. a. What is the magnitude of the electric force between the two balls? b. Is this force attractive or repulsive? c. How many electrons has the glass ball lost in the rubbing process?

What are the three ways that an object can accelerate

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c