Radioactive decay is based on the fact that there are radioactive elements in some rocks that decay at a unpredictable rate<span />
Answer:
20.2g (3 s.f.)
Explanation:
Please see attached picture for full solution.
Volume = 20.0 cm³
density = 19.3 g/cm³
Therefore:
mass = density * volume
mass = 19.3 * 20.0
mass = 386 g
Answer:
a stone has Kinetic energy when it hits the ground.
Explanation:
electric and radiant energy has nothing to do with the stone hitting the ground. kinetic energy has to deal with gravity.
