**THIS IS THE ANSWER**Geologists determine absolute age by comparing the amounts of radioactive and nonradioactive elements in *IGNEOUS rock. The radioactive, or *UNSTABLE
elements decay into nonradioactive elements. Because this
rate of decay is *CONSTANT
for each element, geologists can compare the amounts of stable and unstable elements
to determine how much of the *STABLE
elements have formed over time.

Which of the following is an example of units for speed

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?

Estimate the magnitude of the electric field due to the proton in a hydrogen atom at a distance of 5.29×10 to the power of −11 m, the expected position of the electron in the atom.