For a sunscreen product with equal amounts of tdsa and 2-ehmc to provide adequate protection from uv-a and uv-b rays for 1.00 h, how many molecules of tdsa and 2-ehmc must be present on 0.45 m2 of skin? assume one molecule of tdsa and one molecule of 2-ehmc can each absorb 10,000 photons per hour. assume the photon rate is the same as in part c, 3.066×1021 photons/(m2⋅s) .

An engineering team designs a new rocket that is faster and lighter than any other model being produced. however, the materials end up being so expensive that no company can afford to buy them. which step of the engineering process should have addressed this problem? a. know the background. b. evaluate the results. c. identify a need. d. do the work.

How does decreasing the gas volume affect the pressure of a gas?

Dying the folding patterns of protein molecules can microbiologists better understand cellular processes as well as some diseases, such as alzheimer’s, that are caused by proteins that have misfolded. the folding of these complicated molecules can be simulated on computers, but it takes a lot of processor power and time for even expensive supercomputers to do this. a group of researchers at stanford university developed software that can be used to distribute the processing of data to anyone who is willing to donate time on their idle personal computers. as a result, the researchers have been able to achieve protein-folding simulations that are far better than those other computing methods have done. which statement best describes the work of these researchers? the work is not scientific because the data are not processed in one location. the work is not scientific because the simulations are not reproducible. the researchers applied creativity to solve a problem in running an experiment. the researchers used only well-established scientific techniques.