What element in the periodic table of elements has the greatest number of electrons

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

More solar radiation is absorbed by earth’s surface than by

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.