Determine the electrical force of attraction between two balloons with separate charges of -4.5 x 10^-6 C and +3.0 x 10^-8 6 when separated a distance of 0.82
m. Identify the kind of electric force between the charges. Show complete work
to arrive at your final answer.

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.

Amaterial that provides resistance to the flow of electric current is called a(an) (1 points)