When to multiply by 2


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Jessica Dharmawan 1G
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Joined: Fri Sep 28, 2018 12:15 am

When to multiply by 2

Postby Jessica Dharmawan 1G » Sun Nov 04, 2018 9:05 pm

When do we multiply the uncertainty in p or x or v by 2? I'm getting confused when doing calculations.

Kathryn 1F
Posts: 66
Joined: Fri Sep 28, 2018 12:19 am

Re: When to multiply by 2

Postby Kathryn 1F » Sun Nov 04, 2018 9:11 pm

Do you mean like if the value is given like "the velocity is 10 +- 1 m/s"? in this case, the indeterminacy in velocity is 2, as the velocity could be between 9 and 11. So you would take the +-1 * 2.

If it says "the indeterminacy is (delta)2", then you can take that as is

Sydney Aurelio_Dis4B
Posts: 30
Joined: Fri Sep 28, 2018 12:28 am

Re: When to multiply by 2

Postby Sydney Aurelio_Dis4B » Sun Nov 04, 2018 9:42 pm

If you are referring to a question like on test 2 #2. You multiply momentum by a certain factor, ex) 2. when the problem says "The uncertainty in the momentum of a ball is 2 times its momentum" In that sort of example you would calculate the momentum, then multiply that value by 2 to get the uncertainty in momentum

ariana_apopei1K
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Re: When to multiply by 2

Postby ariana_apopei1K » Mon Nov 05, 2018 11:23 am

You would multiply by 2 when you're given something like +/-0.5 as your value. This uses the same reasoning as the first answer on this post, the two outermost values we can get are .5 and -.5, so when you subtract them (.5--.5) you get 1, the same thing as multiplying .5 times 2.

Ana Pedreros
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

Re: When to multiply by 2

Postby Ana Pedreros » Mon Nov 05, 2018 11:42 am

Would we still multiply it by 2 if we are just given the velocity like 10 m/s?

Sophia Ding 1B
Posts: 62
Joined: Fri Sep 28, 2018 12:16 am

Re: When to multiply by 2

Postby Sophia Ding 1B » Wed Nov 07, 2018 11:26 am

No, if you're just given the velocity you would use that value given. You'd only multiply by 2 if given a range as stated before, like a velocity +/- .35 (for example), as that the .35 dictates the uncertainty and must multiply by 2 to account for the +/- range of it.


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