Check out some similar questions!

Slow · Jul 8, 2004, 05:09 PM

1)You can always add two numbers that have the same units.However,you cannot always add two numbers that have the same dimensions.Explain why not,and inlcude an example in your explanation.
____________________________________________
a)Is it possible for two quantities to have the same dimensions but different units?

b) Is it possible for two quantities to have the same units but different dimensions?
In each of the two cases,support your answer with an eexample and an explanation.? (I can't understand-I'll be freshmen in high school next year)
____________________________________________
a) Considering the fact that 3.28 ft=1m, which is the larger unit for measuring area, 1 ft2 or 1m2?

b)Consider a 1330-ft2 apartment.With your answer to part (a) in mind and without doing any calculations, decide whether this apartment has an area that is greater or less than 1,330 m2.

c)In a 1,330-ft2, how many square meters of area are there?Does this support in part (a) and (b)?

HELP ME HELP ME HELP ME PLEASE..?

psi42 · Jul 8, 2004, 08:52 PM

1)Why you cannot always add two numbers that have the same dimensions? Example?

huh what? This is what we call a badly written question. :)

]
2)Is it possible for two quantities to have the same dimensions but different units?

I suppose what they mean is:

Is three meters equal to three feet? Or something like that.

]
3) Is it possible for two quantities to have the same units but different dimensions?

Huh what? Who writes these things? How do they define "dimensions" and "units"? These terms are openly ambiguous.

I suppose they are asking:

Can you have something that is five feet and something that is three feet?
Well, yes...

]
4) Considering the fact that 3.28 ft=1m, which is the larger unit for measuring area, 1 ft2 or 1m2?

Finally something a bit more clear. Since a square foot is one foot*one foot and a square meter is one meter*one meter, and a meter is longer than a foot, than a square meter is larger than a square foot.

]
5)Consider a 1330-ft2 apartment.With your answer to part (a) in mind and without doing any calculations, decide whether this apartment has an area that is greater or less than 1,330 m2.

Yeah, well, since a square foot is smaller than a square meter, then 1330 square feet is less than 1330 square meters...

]
6)In a 1,330-ft2, how many square meters of area are there?Does this support in part 4 and 5?

Number crunching time. (sqrt(1330)/(3.28))^2

Best of luck,
~psi42

Slow · Jul 8, 2004, 11:26 PM

Hehehe.. sorry,
Thanks Psi 42.
Well you know, I can't study by myself, I need a teacher.
Studying by yourself is not working at all to me.. ekekek.
Thanks Again.

And for the 2nd question, yes.. I think it is something like that

psi42 · Jul 11, 2004, 01:39 PM

Hehehe.. sorry,
Thanks Psi 42.
Well you know, I can't study by myself, I need a teacher.
Studying by yourself is not working at all to me.. ekekek.

Ow...

If you're trying to learn all this by yourself, I'd say you need to find a better book. :)

What book is this anyway?

In my opinion, there are very few math/science textbooks out there that are actually well-written. Most of them are pretty much worse than useless on their own, especially if there are more equations than words in the "examples" section.

If you do manage to find a good book (I'd suggest trying a big-box public bookstore, and don't buy sparknotes--they suck), you should have much better luck.

:)

~psi42