/sci/ - Science & Math

>>11325841
>pressure
No, stress. It's like pressure and has the same units, but it is a tensor quantity. In the case of impact loading, like when you jump on the thing or hit it with a hammer, the force of impact is heavily dependent on the material's elastic properties. The more an object deforms, the less force there is. An exact description of what happens when objects collide is fairly complicated. Look up "coefficient of resititution". The theory of elasticity can be as complicated as you like.
>book
I like Mechanics of Materials by Beer.
Roark's Formulas for Stress and Strain is an absolute classic engie text, good source for stress concentrations and all that.
Also, continuummechanics.org for a more detailed description of elasticity. This is a great source because it builds up all the math as it goes along.

The total angular momentum of a system does not change without external torque. Take the origin to be the center of the carousel. The initial angular momentum is [math] L=(I+mr^2)\omega [/math] where I is the moment of inertia of the carousel itself (without the boy), m is the mass of the boy, r is the radius the boy sits from the origin. Everything is in UCM at the moment. Now the boy is lifted off. There are two very important details to consider: what is the motion of the boy after being lifted off the carousel, and what exactly is our system?
If the boy is lifted vertically off the thing such that he hovers motionless over the intertia frame in which the carousel, we have it that [math] L'=L \implies I\omega'=I\omega+r^2m\omega [/math]. But since all quantities are positive, this can only be true if [math] \omega'>\omega [/math]. So the carousel speeds up.
However in real life, to lift boy up in such a way that he is motionless above the ground, there must be some device to transfer this L to, something like a crane fixed to the earth. Or if a giant lifts him up, the sudden change in L of the boy would be transferred through the tractive force in the giant's shoes to the earth (changing the rotation of the earth some minute amount). In reality, the system cannot just be the boy sitting on a carousel on an infinite inertial plane. This is what really happens, and the carousel's rotation in the frame of the real ground (which is NOT) an inertial frame ends up with no apparent change.
The professor isn't "dumb as fuck," you sophomoric retards. He's actually right, given the assumptions a class covering introductory rigid body dynamics would typically make. Blow me.

>>11306338
>will this work
Usually you determine the reduced pressure (Pr=P/Pcr) of each species weighted by its molar fraction (this is called Kay's rule, I think). Then, you can refer directly to a compressibility chart/table to find Z. Look up Nelson-Obert generalized compressibilty chart, and also Kay's rule. If you are still having trouble, post the whole problem and I will walk you thru later today when I get home.

>>11287583
>>11287562
Where you living rn, Jon?

>>11173400
that is the real formula. you can convert to rectangular form if you like.

>>11162922
You'll blow the fuse because there is no resistance in your circuit. An ammeter, theoretically, has no resistance.

>>11128458
It depends. Ideal gas law is best at pressures that are small compared to critical pressure and temperatures that are high compared to critical temperature. Otherwise, use a compresibility factor/chart. (Pv=ZRT) You can also use some other equation of state like Van der Waals. There are many options to chose from!

>>11121298
>leggings are $45
C'mon Jon

>>11093905
I always like Green Day more than Blink.
>what happens
Come back when it does happen

>>11054331
Physics vids by Eugene Khutoryansky

>>11028860
>he doesnt wear a rubber
You tryna get pozzed? Dumb faggot

>>11028366
>maybe if i do speed it will help
lmao

>>10998368
Have a female friend.

>>10985807
How do you mean stable? Setup B will tend to precess if one tries to rotate it in the plane parallel to the screen. I don't call that stable. Setup A has the advantage of having no new angular momentum.
Tennis racket theorem doesn't apply here. TRT is just a statement about principle moments of inertia, for which they are identical for each setup.

>>10897306
Eugenics implies the overbearing presence of government that enables its existence. Eugenics cannot be implemented without trampling civil rights.

>>10883116
Not really. You can look at entropy within the cylinder, but all of that presupposes an ideal cylinder, ideal gas and so on. You find efficiency experimentally.

>>10863564
Yes. Trans women and men are women and men insofar as they do not impose their lifestyle upon you.

>>10828465
Complex numbers are a type of vector, retard

>>10816983
>openly admitting you browse reddit

>>10762345
Potential energy, basically

>>10758001
>validation is not science
M8...

Because Cesium-137 is the element of concern at the Chernobyl site, which only has a half-life of ~30 years.

>le niggers are dumb

>>10717962
Shut up retard