От зеркальной поверхности луч света отражается под углом 28°. определите угол между падающим и отраженными лучами.
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Ahowler monkey is the loudest land animal and, under some circumstances, can be heard up to a distance of 4.6 km. assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 w/m2. what is the acoustic power emitted by the howler

What is the mass of the same rock on the earth

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.