Determina la magnitud de la fuerza eléctrica entre dos cargas cuyos valores son q1= -6 microcoulombs, q2= 7 microcoulombs, al estar Separadas en el vacío por una distancia de 35 cm (transforma a m).

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

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.

If y gets smaller as x gets bigger and y have an relationship?