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Physics general questions understanding?
1)) Discuss how you would estimate the number of hours you have spent in school thus far in your life. Then make the estimate.
2)) What are the merits and drawbacks of using a person's foot as a standard? Discuss in terms of ease of comparison, invariability, indestructibility, and reproduceability.
(a) Consider a system using a particular person's foot.
(b) Consider a system using any person's foot.
1 Answer
- az_lenderLv 79 years agoFavorite Answer
(1) Multiply length of school day in hours
times 5 days per week
times number of weeks per school year (36?)
times number of years you've been going to school
(2)
(a) Using a particular person's foot is poor for "indestructibility" -
his foot can be smashed.
Not great for "invariability," as even adults' feet grow slightly as they age.
"Reproduceability" - once you start to reproduce objects that were
measured to replicate the length of that person's foot, you have already
solved some of the problems associated with using a person's foot.
Or are they talking about reproducing results of measurement?-in that case,
I fail to see how it differs from "invariability."
"Ease of comparison" - poor. You may not have access to that person.
(b) "Any person's foot" - ease of comparison just fine. Use your own foot!
Invariability - forget it! You are using everyone's different-sized feet.
Indestructibility - not too much of a problem, since there's always
some other person's foot.
Reproduceability - not a problem, but not a solution in the way that it was
when only one person's foot was involved.
