What is the pressure at the bottom of a 2.50 m deep pool of water(unit=Pa)?

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?

Which system of units is used by only a small number of countries in the world, including the u.s.