A 0.75kg key is attached to the end of a 0.25m lanyard. The key is swung in a horizontal circle and has an acceleration of 2.5m/s/s. a. Calculate the velocity of the key b. Calculate the centripetal force acting on the key

Select all that applywhat are some basic resources a family is expected to provide for children? educationclothesspending

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.