Two small plastic spheres are given positive electrical charges. when they are 16.0 cm apart, the repulsive force between them has magnitude 0.200 n.

a)what is the charge on each sphere if the two charges are equal?

b)what is the charge on each sphere if one sphere has four times the charge of the other?

Orque can be calculated by multiplying the force (n) applied at 90? to the lever arm at a distance (m) from the pivot point (point of rotation), the compound si unit for the torque is n? m. if the force (at 90? to the lever arm) applied is 15 n and it is applied at 2.0 m from the pivot point (point of rotation), what is the torque on the lever?

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

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