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NationalTutoringObservatory
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MathEd-PII

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8
volunteer
Well, I
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volunteer
I
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volunteer
um I don't know, I don't, I don't know about that.
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volunteer
but
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student
Oh, OK
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volunteer
you can't, you, yeah, you can, so that, that's one, it was one half, right?
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student
Yeah
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volunteer
They
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volunteer
So you go ahead and put 1/2 squared, right?
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student
Yup
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volunteer
OK, beautiful
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volunteer
So square
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volunteer
and then DHDT, right?
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student
Yeah
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volunteer
Beautiful.
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volunteer
All right, let's
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volunteer
let's solve, uh, simplify a little bit more, so negative point.0.
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volunteer
0.
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volunteer
03 equals
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volunteer
looks like pie over
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volunteer
16
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volunteer
(1/4)H^2, right
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volunteer
Time DHDT
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student
Mhm
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volunteer
OK
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volunteer
we should be able
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volunteer
we're asked to find, we're asked to find DHDT. So,
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volunteer
let me go
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student
So we divide the pyro
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volunteer
Yeah
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student
Actually we're multiply 16 over pi.
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volunteer
right
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student
to both sides
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volunteer
exactly right. I'll go ahead and do it on my calculator. You might want to go ahead and do it whatever way you wanna.
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student
OK
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volunteer
and 0
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volunteer
OK, I got an answer. Let's see if we get the same.
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student
I don't think we need to plug for pie.
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volunteer
OK, um, you can do that or not. I did plug it for pie and I got
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volunteer
negative 0.15
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volunteer
2728
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volunteer
but depending on what your answer key shows, um.
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student
Yeah, the answer key uh shows -0.48 over pi and it shows equals -0.153 ft per second.
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volunteer
that's exactly the same thing I got.
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volunteer
Awesome
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student
Yeah
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volunteer
Awesome, awesome, awesome
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volunteer
Very nice job
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student
Right
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volunteer
So
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volunteer
you might say
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volunteer
you know, the, the I, the only reason I know
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volunteer
that I had to get rid of the R
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volunteer
is because of experience.
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volunteer
So there's always a little trick to these problems.
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volunteer
In this case, it's similar triangles.
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volunteer
where you're trying to
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volunteer
get rid of the R variable so that you just have things in terms of age.
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student
Mhm
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volunteer
but it's not really
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volunteer
necessarily gonna come always without experiencing the, you know, these problems.
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volunteer
just working them. That's like the tangent of the angle when we did on the last problem.
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volunteer
You know, you're only gonna know to do that after you work a few and you say, oh yeah.
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volunteer
but
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volunteer
anyhow
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student
OK, I had a question about like the units cause we definitely have to put you in my gift points up. And the last one, it was Radiance per second, but like on the
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volunteer
Yes.
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student
on the problem, there was nothing like that said that ever said radiance. So does that mean that for every trach functions like we use like the answer always have like radius for like seconds, minutes, whatever.
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student
OK
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volunteer
So when you're dealing with angles
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volunteer
and you're dealing in calculus.
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student
OK
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volunteer
Radiance is a sort of a natural unit of measure.
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student
OK
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volunteer
that
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volunteer
is used, degrees do not mean anything in this, in this world.
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volunteer
So whenever you're, you're solving for something defeta ET or, you know, just solving for an angle, and you get number, it's always gonna be in radiance.
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volunteer
It's sort of the natural
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volunteer
measure of an angle
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volunteer
Um
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volunteer
so
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volunteer
yeah, it'll always be, when you do get answers, you should plug in pi and you could always get answers in radios and
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volunteer
degrees do not
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volunteer
ever come into play really, unless you're just converting from one to the other to give it in, in that
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volunteer
angle.
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volunteer
measurable like degree measurement.
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student
OK, so do you still have time or you gotta go?
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volunteer
Uh, I got time for a little more.
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volunteer
I, I hope
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volunteer
you know, you're kind of getting
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volunteer
getting the idea. It's really not that difficult, but like I said, there's
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student
OK.
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volunteer
tricks to every one of these, and that's the hard part. Don't know what the trick is.
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student
OK, let me go on to something.
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volunteer
I'm gonna
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volunteer
take a break for a minute and I'll be right back, OK?
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student
Yeah, you can take a break
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volunteer
I'll be back in about 2 minutes.
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student
OK, no problem
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volunteer
OK, I'm back
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