A 0.00287 C charge is 6.52 m from a -0.00555 C charge. What is their
electric potential energy? Include
the correct sign (+ or -).
(Unit = J)

What is the coefficient of kinetic friction μk between the block and the tabletop?

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.

7types of electromagnetic waves from lowest to highest frequency