A small particle has charge -7.00 μC and mass 1.50×10^(−4) kg. It moves from point A, where the electric potential is VA = 300 V, to point B, where the electric potential VB = 600 V is greater than the potential at point A. The electric force is the only force acting on the particle. The particle has a speed of 5.80 m/s at point A.
(a) What is its speed at point B?
(b) Is it moving faster or slower at B than at A?

Next a skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 15 with the horizontal. the rope moves parallel to the slope with a constant speed of 0.69 m/s. the force of the rope does 800 3 of work on the skier as the skier moves a distance of 8.4 m up the incline. (a) if the rope moved with a constant speed of 2.2 m/s how much work would the force of the rope do on the skier as the skler moved a distance of 8.4 m up the incline? at what rate is the force of the rope doing work on the skier when the rope moves with a speed of (b) 0.69 m/s and (c) 2.2 m/s?

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2