Which of the following changes would decrease the force between two charged particles by a factor of 9? A.
Increasing the amount of charge on each particle by a factor of 9
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B.
Decreasing the distance between the particles by a factor of 3
done

C.
Increasing the distance between the particles by a factor of 3

D.
Decreasing the amount of charge on one of the particles by a factor of 3

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

Uppose we consider the system of the three capacitors as a single "equivalent" capacitor. given the charges of the three individual capacitors calculated in the previous part, find the total charge qtot for this equivalent capacitor. express your answer in terms of v and c.