WEBVTT
1
00:00:01.540 --> 00:00:05.240 A:middle L:90%
Okay, so we have that a 9.5 gram bullet
2
00:00:05.299 --> 00:00:09.419 A:middle L:90%
. Okay, so M equals 9.5 grams. Okay
3
00:00:09.419 --> 00:00:17.649 A:middle L:90%
. Which is gonna be zero point zero 095 kilograms
4
00:00:18.239 --> 00:00:25.420 A:middle L:90%
. Okay. 123 Yes. So 0.95 kilograms.
5
00:00:25.420 --> 00:00:27.050 A:middle L:90%
Okay. That is the mass of the bullet.
6
00:00:27.739 --> 00:00:33.429 A:middle L:90%
And its velocity V is 1.3 kilometers per 2nd 1.3
7
00:00:33.429 --> 00:00:36.280 A:middle L:90%
kilometers per second, which in meters per second is
8
00:00:36.280 --> 00:00:39.420 A:middle L:90%
gonna be 1000 and 300 meters per second. Okay
9
00:00:39.420 --> 00:00:41.229 A:middle L:90%
, so I'm just converting to s o units right
10
00:00:41.229 --> 00:00:43.740 A:middle L:90%
off the bat, and we want to calculate the
11
00:00:43.740 --> 00:00:46.399 A:middle L:90%
kinetic energy. Then we want to see what happens
12
00:00:46.399 --> 00:00:49.390 A:middle L:90%
to the kinetic energy if we have the speed and
13
00:00:49.390 --> 00:00:50.719 A:middle L:90%
and if we double it. Okay, so our
14
00:00:50.719 --> 00:00:53.710 A:middle L:90%
first term is gonna be so this is a B
15
00:00:53.780 --> 00:00:55.590 A:middle L:90%
. C. Eve's gonna do these one after the
16
00:00:55.590 --> 00:01:03.259 A:middle L:90%
other. So we got 1/2 times 0.95 1/2 times
17
00:01:03.259 --> 00:01:10.140 A:middle L:90%
0.95 and again. One halftime. 0.0 95 Okay
18
00:01:10.140 --> 00:01:15.150 A:middle L:90%
. Remember that kinetic energy is 1/2 m v squared
19
00:01:15.140 --> 00:01:17.920 A:middle L:90%
. All right, and then ah, this is
20
00:01:17.920 --> 00:01:19.439 A:middle L:90%
just gonna be with a regular speed, which is
21
00:01:19.439 --> 00:01:23.760 A:middle L:90%
13 100 meters per second. Okay, if we
22
00:01:23.760 --> 00:01:27.650 A:middle L:90%
have that, that's gonna be 650 meters per second
23
00:01:29.239 --> 00:01:32.040 A:middle L:90%
. And if we double that initial speed, Okay
24
00:01:32.049 --> 00:01:36.400 A:middle L:90%
, it's gonna be Ah, 2600 meters per second
25
00:01:37.239 --> 00:01:38.959 A:middle L:90%
. All right, then, if we calculate this
26
00:01:40.250 --> 00:01:42.769 A:middle L:90%
Ah, the 1st 1 is gonna be at eight
27
00:01:42.769 --> 00:01:45.230 A:middle L:90%
. Jules, 2nd 1 is going to be about
28
00:01:45.230 --> 00:01:48.670 A:middle L:90%
to Jules, and the 3rd 1 is going to
29
00:01:48.670 --> 00:01:52.310 A:middle L:90%
be about 32 jewels. Okay, so check it
30
00:01:52.310 --> 00:01:55.680 A:middle L:90%
out. This 3rd 1 was doubled and this 1st
31
00:01:55.680 --> 00:01:59.159 A:middle L:90%
1 was halved. Okay? And the 3rd 1
32
00:01:59.170 --> 00:02:01.560 A:middle L:90%
is way bigger than the middle one. We could
33
00:02:01.560 --> 00:02:06.230 A:middle L:90%
say right. That's because the energy scales with the
34
00:02:06.230 --> 00:02:08.090 A:middle L:90%
square of the velocity. So the the like a
35
00:02:08.090 --> 00:02:13.449 A:middle L:90%
doubling off velocity. Okay. Has ah lot more
36
00:02:13.449 --> 00:02:15.050 A:middle L:90%
effect when you have ah, square. Okay.