Why do scientist use radioactive decay to figure out how old stuff is

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

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

How do the kidneys affect homeostasis