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### Unicorn Practice Midterm #8

Posted: Mon May 07, 2018 7:15 pm
A bullet of mass 2.8 g travels at 373.23 ± .34 m/s. What is the indeterminacy of position?

could anyone help on where to start on this

### Re: Unicorn Practice Midterm #8

Posted: Mon May 07, 2018 7:34 pm
Hi so since the velocity can be + or - .34 we would multiply it by two since that is the amount we can go in two directions this then becomes the uncertainty in velocity. Then you can convert the g into kg and plug into the equation delta-p = mass* delta-v then plug in delta-v and mass into the equation... this will give you the uncertainty in momentum which is delta p then you can plug in the value of delta-p into the equation delta-p * delta-x= h/4pi then solve for delta x which will give you the uncertainty in position... hope that helps!

### Re: Unicorn Practice Midterm #8

Posted: Tue May 08, 2018 12:14 am
If the question was asking "can you blame the Heisenberg Uncertainty Principle?" what would the answer be? Yes or no?

I know that if the uncertainty is really small then you can't blame the uncertainty principle but how small is too small?

### Re: Unicorn Practice Midterm #8

Posted: Wed May 09, 2018 2:03 pm
I keep getting 10^-31 instead of 10^-32, can someone help me figure out where I went wrong?

I converted the g to kg and made sure I used the right units..