Physics question #2
started by sara Boji 2 mnths agoReplies
You have really figured out who I am.
Once in a while, I get these sudden brainwaves and post on Sulekha.
Nowdays, I read undergraduate text books to pass time.
Now I am on to Physics and probability theory.
BTW I do agree that sometimes I post nonsense on Sulekha.
As long as I do not post porn or get into a gutter fight with people here, I think I am OK.
Like Gyanputra says, I am not asking anyone to read whatever I post here.
>>> and is that after your graduate degree already? what seems to be blowing you backward "reading-wise"?
====> A lot of subjects in my undergraduate days, I passed by just cramming in the last minute particularly formulas.
BTW you can easily get a Master's degree from a second-tier American university particularly in fields like information systems or busines management. Any kid with decent marks from an Indian high school has the requisite background.
Actually, before one can officially work on Ph.D. thesis, some universities / depts. require the candidate to pass a comprehensive exam. And to be able to pass that exam., one has to know the basic school, undergrad and grad subjects, almost have the stuff on fingertips (for the oral part of exam). So in my case, I did take and qualify the comprehensive exam (for mech. / aerospace engg.) and covered majority of topics in sciences and engg. as a part of preparation. Btw, let me assure you, it's one of the toughest exams.and requires a very good understanding in school, undergrad and grad level courses / subjects.
Just plugging the numbers in P1V1/T1 = P2V2/T2 without understanding clearly the laws of thermodynamics won't do.
>>> You should have attended classes / lectures the first time (while still undergraduate) - if you had done that, you wouldn't have to wait till graduation and then read the lectures and find them engaging.
> ... wait till graduation and then read the lectures...
* Persistent Reading Comprehension Disorder detected *
Such honesty is what sets you apart from the likes of Seva, Sara Boji! Based on his responses to various math and physics questions posted here, one would have expected Seva to read high school math and physics textbooks, but that ain't gonna happen anytime soon.
One could expect "blow back" velocity of 0.15 m/sec.
I've only seen people getting thrown in the same direction as the projectile, and never in the opposite direction as your language suggests. So if shot from behind by a pursuer, the victim should get thrown forward as per physics (and from all the action moves I've seen).
http://mcadams.posc.mu.edu/headwnd.htm
sends impulses down the system, non-regulated impulses. And what happens is, an animal -- and it doesn't matter whether they are anesthetized or unanesthetized -- an animal shot in the head, the legs fly up, the bullet passes through, and all of a sudden you see this reaction of the front legs coming up and the hind legs swinging out. Naturally in a timeframe it takes place in fractions of a second, so fast that you wouldn't see it with the naked eye, you would merely see the animal fall, but on a high speed motion picture you can see the process.
[later]
Q. What is your opinion, based upon the expertise that you have acquired in these 18 years at the Edgewood Arsenal in wound ballistics, with respect to the question of the direction from which the bullet came that struck the President in the head?
A. Well, the President in 313, the head appears to have moved slightly forward from the previous frame. Now, I say appears, because unless you measured this precisely you don't know. But it appears to have moved slightly.
And this would not be inconsistent with the momentum of the bullet being transferred to the head. Whereas I said a bullet cannot knock a person down or move a body in any violent way, it could conceivably move the head a little bit. We fired at human skulls filled with gelatin sitting on the table, and they would roll off the table. And this apparent side movement of the head is in the correct direction if the bullet came from the book depository.
Q. That is, from the rear of the President? describe for us very briefly the kinds of studies that you have been engaged in over these 18 years? Describe for us briefly, if you will, what kinds of studies you have made of the reactions of animal bodies or human bodies to high velocity bullets being fired into the various portions of those bodies?
A. From the rear of the President.
-Anthrone (May give answers)