Tritium has a half-life of 12.5 years. If you start with 10 g, how much tritium would be left after 75 years? Find the number of half lives. *
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If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?