Hristina and Richard are building a wooden raft from logs. Each log is 3 meters long and has a diameter of 16 cm, how many logs would they need to just barely float them? Assume the combined mass of Hristina and Richard is 121, and the density of wood is 0.720 g/cm3.

What are atoms of the same element with varying number of neutrons

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.

The radius of an atom is closest in size to a