An object is bouncing on a spring. The period of oscillation for the object and spring is 2 seconds. If the spring coefficient for the spring is .8, then what must the mass of the object be?​

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

Why do some scientists and archeologists think that volta was not the first person to build a battery