An atom of an element can change into an atom of another element if it is A
extremely stable and has a long life.
B
radioactive and its nucleus emits or traps particles.
С
an isotope and it contains more electrons than neutrons.
D
an ion and its atomic number is larger than its mass number.

Find the volume of the ellipsoid x^2+y^2+5z^2=36.

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?