Particles q1, 92, and q3 are in a straight line. Particles q1 = -28.1 uc, q2 = +25.5 uc, and 43 = -47.9 uc. Particles qı and q2 are separated by 0.300 m. Particles q2 and q3 are separated by 0.300 m. What is the net force on q3?​

Aproton is projected toward a fixed nucleus of charge +ze with velocity vo. initially the two particles are very far apart. when the proton is a distance r from the nucleus its velocity has decreased to 1/2vo. how far from the nucleus will the proton be when its velocity has dropped to 1/4vo?

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?