The element rhenium (re) has two naturally occurring isotopes, 185re and 187re, with an average atomic mass of 186.207 amu. rhenium is 62.60% 187re, and the atomic mass of 187re is 186.956 amu. calculate the mass of 185re. (give your answer to 3 decimal places.)

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.

Which example has gravitational potential energy? a.a horse slowing down from a run b.an apple about to fall from a tree branch c.a bicycle being pedaled down a horizontal path d.beaker sitting on the floor

This is the number of complete movements of a wave per second.