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Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

Jasmine, at 33 months of age, is able to engage in some self-care behaviors but still has trouble with tasks such as putting on socks. a few months later, she accomplishes this same task relatively easily. the change in abilities is most likely due to