As a result of collisions with cosmic rays and solar wind the earth has an approximate net electric charge of -6.8 (10 a 5) c. find the charge that must be provided to an object of 1 gram to levitate electrostatically near the surface land

Blank liquids and gases exert a buoyant force on objects placed in them

The substances that are necessary for producing of certain hormones and that store and transport vitamins

Amerry-go-round of radius r, shown in the figure, is rotating at constant angular speed. the friction in its bearings is so small that it can be ignored. a sandbag of mass m is dropped onto the merry-go-round, at a position designated by r. the sandbag does not slip or roll upon contact with the merry-go-round. how would you rank the following different combinations of m and r on the basis of the angular speed of the merry-go-round after the sandbag "sticks" to the merry-go-round from largest to smallest. a) m = 10kg, r = 0.25r b) m = 20kg, r = 0.25r c) m = 10kg, r = 0.50r d) m = 10kg, r = 1.0r e) m = 15kg, r = 0.75r f) m = 40kg, r = 0.25r