A100 g ball on a 60-cm-long string is swung in a vertical circle about a point 200 cm above the floor. the string suddenly breaks when it is parallel to the ground and the ball is moving upward. the ball reaches a height 600 cm above the floor. what was the tension in the string an instant before it broke?

Rohit is trying to tune an instrument

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?