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

Societal demands are not a legitimate driving force of scientific endeavor.

What is the efficiency of a machine that has work input of 40 joules and work output of 35 joules

A bullet B of mass mB traveling with a speed v0 = 1400 m/s ricochets off a fixed steel plate A of mass mA. Let mA ≫ mB so that it can be assumed that mBmA→0. If the incidence angle of the bullet is θ = 15° and the COR of the impact is e = 0.

Name the property illustrated be each statement. If t - 13 = 52, then 52 = t - 13

An archer provides 50 J of potential energy to her bow before release the arrow. What will be the kinetic energy of the arrow it is release from the bow?

Ceres is a dwarf planet located in the main asteroid belt.

Which solid is the best thermal insulator A. brass b. ice C. styrofoam D. copper

When a high-mass star explodes, which of the following is left over in the center? A. Black hole B. Neutron star C. White Dwarf D. either a or b

Which object is an insulator?

Whats the difference between population density and population size?