If two negatively charged small sphere, one with twice the charge of the other, are 18cm a part in air. calculate the charge on each if the force exerted by each on the other is 0.00081?

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

What is the role of lenses in microscopy?

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.