 So, let's do the second Heisenberg uncertainty example. So this one says a baseball of mass 0.15 kilograms thrown at 100 miles per hour has a momentum of 6.7 kilograms meters per second. If the uncertainty in measuring this momentum is 1.0 times 10 to the negative seventh of the momentum, calculate the uncertainty in the baseball's position, okay? So the only thing they give you are the momentum and the measurement uncertainty of the momentum. So remember that any time you're looking for the actual uncertainty of something, right, in this case the momentum, it's going to be the uncertainty of that measurement times the value. Okay? So in this case it's going to be the uncertainty and P is 6.7 kilogram meter per second, so that means this is 6.7 times 10 to the negative seventh kilogram meters per second. Okay? So that's going to be the uncertainty in the momentum. Okay? So, well, we want to figure out, well, what's the uncertainty in position? So, what's that? Okay? So what do we need to do? Yeah? For that formula. H. H. H. H. H. H. H. H. H. H. H. H. H. So alright, the only thing that we need to know is H that's Clanx concimics given to us right. So 6.636 times 10 to the negative 34 joule seconds. Okay? So remember also the conversion between joules kilogram meter squared per second square, In order to do these problems, it's easier if you rearrange this to be like one joule second squared is one kilogram inverse squared, okay, that would be just, it just be, okay. So we'll figure out what's the minimum uncertainty in the position, so 6.636, and it stands to the negative 34 joule seconds. So we're going to do our conversion, joule second squared, one kilogram meter squared, divide that by 4 pi, and then the uncertainty in momentum, 6.7 times 10 to the negative 7 kilogram meters, alright, like that, okay. So let's cancel our units, hopefully we're going to get meters at the end, okay, so joules cancels with joules seconds, with one of the seconds, kilograms with kilograms, meters with one of the meters, and the other second with the other second. So all we have to do now is just plug in our numbers, okay, so let's do that together. So I get to two significant figures, 7.9 to the negative 29, so that is so tiny, okay. So it's so small that for something as big as the baseball, you can't, it's imperceivable, that wavelength, okay. So this number is so tiny that we'll usually use, not quantum, not usually use quantum mechanics on these big items, okay. Questions on this one?