You can not use a person first name in second reference. Its to be full name mean surname
Fg or gravitational force between two objects is proportional to the product of the masses of the two objects and inversely proportional to the square of the distance between them. If the masses increase by a factor of 10, then Fg increases by 10^2 or by a factor of 100.
William McKinley won the election of 1896 on a platform of increased industrialization, higher wages, and the "gold standard." He was later assassinated at gun point during his second term in 1901.
