A0.2kg ball rotates at a constant speed of 3 m/s on the end of 1.2 m long string. what is the centripetal acceleration of the object?

Asteady current of 1 ais flowing through a conducter calculate the number of electrons that flows through conductor in 1second

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

What is the gravitational attraction between a dating couple whose centers of mass are 0.630 m apart if the boy weighs 715 n and the girl weighs 465 n?