Question

What is 3.2 × 10−4 m/h in centimeters per second?



A.


8.889 × 10−6 cm/s


B.


8.889 × 10−5 cm/s


C.


1.152 × 10−5 cm/s


D.


1.152 × 10−7 cm/s

Answer 1

"3.2 × 10−4 "
using the following latex "\large 3.2 × 10^{−4} we get: "\(\large 3.2 × 10^{−4} \)

Answer 2

oh god what

Answer 3

omg yeah ikr it's a mess

Answer 4

anyhow convert miles per hour to miles per second, then we can convert miles to meters to centimeters

Answer 5

problem is , i don't know how .. ugh more math to study cries

Answer 6

I have a used tissue somewhere here if you need it

Answer 7

oh my thanks yes , I'm running out >_<

Answer 8

ok. here's an example of dimensional analysis. if we wanted to convert 320km to miles:
we know that 1 mile is 1.60934km thanks to google.

Next we multiply by a proportion that is equal to 1 that allows us to "cancel" the units.
\[\huge \frac{320\cancel{km}}{}*\frac{1mi}{1.60934\cancel{km}}=...\]

Answer 9

I've never been so confused in my life

Answer 10

Google/youtube dimensional analysis.

Basically if we want to convert 30 minutes to hours we would do the following

\(\large \frac{30 \cancel{min}}{1} * \frac{1 hour}{60 \cancel{min}}=\frac{30}{60}=0.5hours\)

Answer 11

I already posted this in your previous post http://openstudy.com/users/kirbykirby#/updates/540a0470e4b0d8ead1bcb9e8

Answer 12

@bibby Hmm I thought the \(m\) was for metres. @kewlkatcutie Do you know if they are using metres or miles?

Answer 13

the m is for meters. I gave an irrelevant example to demonstrate dimensional analysis @kirbykirby

Answer 14

It doesn't say ; _ ;

Answer 15

Oh ok I see :)

Answer 16

Is the correct answer D ?

Answer 17

What did you do to find that? All you need to do is convert the metres into centimetres, and then the hours into seconds.

1 m = 100 cm
1 hour = 60 min..... but 1 min = 60 seconds. So 1 hour = (60)(60) = 3600 seconds. I posted the right way though to do the dimensional analysis that shows that the units are correct

Answer 18

Follow @bibby's examples up there.. it's maybe more clear from them what the idea behind dimensional analysis is

Answer 19

so .. \[\frac{ 100 }{ 3600 }\] .. ?

Answer 20

\[\huge \frac{3.2*10^{-4}m}{1\cancel{hr}}*\frac{1\cancel{hr}}{60 \cancel{\min}}*\frac{1\cancel{\min}}{60 \sec}\]

that's how you get meters per second