In a vacuum, two particles have charges of q1 and q2, where q1 = +4.2c. they are separated by a distance of 0.31 m, and particle 1 experiences an attractive force of 4.5 n. what is the value of q2, with its sign?

What is special about a dc circuit ?

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .

If state law mandates that elevators cannot accelerate more than 2.40 m/s2 or travel faster than 14.8 m/s , what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor? ?