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Time Conversions

Posted: Wed Mar 13, 2019 9:22 pm
by Mya Majewski 1L
For [A]=[A]oe^-kt, there seems to always be conversions associated with the -kt and time, do you convert the k or the t to equal the same units (minutes, seconds, hours) as one another?

Re: Time Conversions

Posted: Wed Mar 13, 2019 9:30 pm
by Karan Thaker 2L
Use the appropritate time conversions: 1 hr is 60 mins, 60 secs in 1 min, 24 hr in day, etc.Set up diagonal conversions to cancel units out and end in whatever time unit you need.

Re: Time Conversions

Posted: Wed Mar 13, 2019 10:21 pm
by Yvonne Du
Yes, just make sure that your units are consistent.

Re: Time Conversions

Posted: Wed Mar 13, 2019 10:53 pm
by Mya Majewski 1L
if your k is in min^-1 and your t is in seconds then what do you do?

Re: Time Conversions

Posted: Wed Mar 13, 2019 11:30 pm
by 805169754
Mya Majewski 1L wrote:if your k is in min^-1 and your t is in seconds then what do you do?

You can convert either one as long as it matches/is consistent with the other. You should try to see if the question specifies in what units it wants the answer.

Re: Time Conversions

Posted: Thu Mar 14, 2019 1:36 am
by Ethan Breaux 2F
always use the units that the question initially gives you unless stated otherwise. so yeah convert everything to one type of unit. and don't forget conversions between kJ and J (unrelated sidenote)

Re: Time Conversions

Posted: Sun Mar 17, 2019 10:55 am
by Claudia Luong 4K
You can use any time unit as long as the same time unit is used for all values in the problem.

Re: Time Conversions

Posted: Fri Mar 06, 2020 11:10 pm
by Abigail_Hagen2G
So, it doesn't matter seconds or minutes as long as you have all the same units.

Re: Time Conversions

Posted: Fri Mar 06, 2020 11:25 pm
by 205405339
both should have the same units. it does not really matter what unit it is as long as units match

Re: Time Conversions

Posted: Sun Mar 08, 2020 6:35 pm
by kristi le 2F
The units should be the same so that they will cancel out when doing calculations. Also, sometimes, the question will ask for the answer in a particular unit.