One of the many by products of uranium is radioactive plutonium, which has a half life of approximatley 25000 ytears. if some of this putonium is encased in concrete, what fraction of it will remain after 100 years?

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c.what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?