Question

0.74 kilocalories per minute to calories per second ( Scientific Notation) I know 1000 is the calories and then it would be 740 so would it be 7.40 x 10 ^2??

Answer 1

you forgot to divide it by 60 to get minutes into seconds

Answer 2

would I divide 740 by 60 or before i moved the decimal?

Answer 3

you can do it anytime to be honest

Answer 4

7.4 * 10^2 is the same as 740

but it's easier to divide 740 because you won't get confused with any of the decimals and you can figure it out properly after you divide it by 60

Answer 5

ok so id get 12.3333333 id move it once i believe to make it 1.23333333 I think ?

Answer 6

and what's the exponent on 10 if you're moving it over once to the left

Answer 7

\(\color{#0cbb34}{\text{Originally Posted by}}\) @lilbene
ok so id get 12.3333333 id move it once i believe to make it 1.23333333 I think ?
\(\color{#0cbb34}{\text{End of Quote}}\)
12.3333 is right

Answer 8

thank you for the medal

Answer 9

-1? @AZ

Answer 10

Are you sure?
\( 10^{-1} = \dfrac{1}{10^1} = \dfrac{1}{10}\)

when you move the decimal to the left, the exponent should be positive

like when you move it two times to the left in 740 to get 7.40 * 10^2

If you're moving the decimal to the RIGHT, then the exponent is going to be negative

Answer 11

oh ok your right so it is 1.23333333 x 10 ^ 1 ?

Answer 12

You got it!

Answer 13

Have you learned about significant figures?

Answer 14

yes I have just not much about the different conversions and its been a while i learned this around october!

Answer 15

I'm just trying to see if you should cut down on some of those digits or if it doesn't matter when you submit that answer

Answer 16

Ah okay, because we started off with 0.74 which has two significant figures

so our final answer should also have 2 sig figs
unless the teacher doesn't care then you could just put as many digits as you want haha

Answer 17

I honestly don't know she never mentioned anything about how many numbers she would like us to have but understandable a lot of 3"s !

Answer 18

It's a never ending 3 that's why haha but you can definitely drop a few. From what I've noticed, they really only care about the sig figs when they teach that in the beginning of the year and then after that you just move on haha

Answer 19

especially when you have multiple choice, it becomes irrelevant

Answer 20

your right, and I wish she doesn't believe in multiple choice which makes everything harder :(

Answer 21

I always 2nd guess myself

Answer 22

You shouldn't! If you're able to calculate some number that's the same as the answer choice, you're most likely right!

Unless you make like a common mistake which is what they're testing- to make sure you're able to use the formula correctly
But if you know your stuff, you'll be fine!!