WEBVTT
1
00:00:01.040 --> 00:00:04.960 A:middle L:90%
in number six were asked to find the approximate radius
2
00:00:05.200 --> 00:00:11.300 A:middle L:90%
volume and density of copper 65. I'm so radius
3
00:00:11.300 --> 00:00:15.949 A:middle L:90%
, We're going to use my nuclear radius equation here
4
00:00:16.589 --> 00:00:19.839 A:middle L:90%
. This is the constant proportionality. Um, this
5
00:00:19.839 --> 00:00:26.550 A:middle L:90%
is the atomic mass raised to the 1/3 power.
6
00:00:29.579 --> 00:00:34.060 A:middle L:90%
Well, this constant is 1.2 times 10 to the
7
00:00:34.149 --> 00:00:38.289 A:middle L:90%
negative. 15 meters or 1.2 50 meters. But
8
00:00:38.539 --> 00:00:41.750 A:middle L:90%
I'm going to keep it in that my atomic number
9
00:00:41.750 --> 00:00:45.630 A:middle L:90%
65? No, my atomic mass. No,
10
00:00:45.789 --> 00:00:49.100 A:middle L:90%
my mass number is 65 you know, raise that
11
00:00:49.100 --> 00:01:00.399 A:middle L:90%
the third power and I get 4.8 centimeters or 4.8
12
00:01:02.340 --> 00:01:10.390 A:middle L:90%
times 10. It's the negative 15th meters. Um
13
00:01:10.400 --> 00:01:12.250 A:middle L:90%
, report be one of the volume. Well,
14
00:01:12.250 --> 00:01:15.769 A:middle L:90%
I'm assuming it's spherical. So the volume of a
15
00:01:15.769 --> 00:01:22.010 A:middle L:90%
sphere is 4/3 pi r cubed. And I just
16
00:01:22.010 --> 00:01:36.319 A:middle L:90%
found our so 4/3 pie times 4.8 times 10 to
17
00:01:36.329 --> 00:01:41.650 A:middle L:90%
the negative 15 meters. And like it's cute.
18
00:01:44.840 --> 00:01:48.269 A:middle L:90%
I get it. She probably only have two significant
19
00:01:48.269 --> 00:01:57.950 A:middle L:90%
figures on this. Also, I get 4.6 times
20
00:01:59.189 --> 00:02:12.270 A:middle L:90%
10 to the negative 43 with the meter's cubed and
21
00:02:12.270 --> 00:02:15.069 A:middle L:90%
then for part C m finding density Well, densities
22
00:02:15.069 --> 00:02:30.300 A:middle L:90%
and mass pavilion my mask. This mass number.
23
00:02:30.300 --> 00:02:32.439 A:middle L:90%
That's how many atomic mass units. I'm going to
24
00:02:32.439 --> 00:02:36.090 A:middle L:90%
change that to Kilograms. I'm gonna do that right
25
00:02:36.099 --> 00:02:38.939 A:middle L:90%
in my equation here. So this is 65.
26
00:02:40.509 --> 00:02:43.389 A:middle L:90%
They usually don't include units in here, but I'm
27
00:02:43.389 --> 00:02:47.620 A:middle L:90%
going to 65. You and we have available conversion
28
00:02:47.620 --> 00:02:51.110 A:middle L:90%
in here. Um, I looked it up and
29
00:02:51.110 --> 00:02:57.949 A:middle L:90%
I know there's 1.66 times 10 to the 27th kilograms
30
00:02:58.770 --> 00:03:05.349 A:middle L:90%
and each you So 1.66 times 10 to the negative
31
00:03:05.349 --> 00:03:14.550 A:middle L:90%
. 27th. When that is kilograms. Kilograms.
32
00:03:19.240 --> 00:03:27.539 A:middle L:90%
True. That's one Promise unit and then the bottom
33
00:03:27.539 --> 00:03:38.949 A:middle L:90%
My volume is gonna be in this meters cubed soon
34
00:03:38.949 --> 00:03:42.699 A:middle L:90%
. Tell Mei Yue's canceled and I'm left in kilograms
35
00:03:43.060 --> 00:03:52.919 A:middle L:90%
per meter. Cute. I get 2.33 I guess
36
00:03:52.919 --> 00:04:03.069 A:middle L:90%
I should just have 2662.3 times Tentatively 17 kilograms per
37
00:04:03.069 --> 00:04:06.349 A:middle L:90%
meter. Cube. They're very dense.