/sci/ - Science & Math

>>11693595
I'm just gonna straight up copy and paste an explanation I've given before.

/mass/ moment of inertia AKA moment of inertia is [math] \int r^2\text{ d}m [/math]. it measures how hard it is change angular momentum of an object. analogous to mass. units of slug-inches-squared. there's a scalar MoI associated with each axis of a reference coordinate system affixed the object you care about, you can write it as a tensor
/area/ moment of inertia AKA second moment of area is [math] \int r^2\text{ d}A [/math]. it measures how rigid a shape in the plane. this is a strictly geometric thing. units of inches-to-the-fourth. see parallel and perpendicular axis thms.
If planar density is constant and plates are thin, then mass moment of inertia is just second moment of intertia*density

>>11497900
No. Cocaine has a pretty short half life. You're going to be okay.

>>11364496
To actually measure viscosity of a gas is quite difficult and you will need some method of measuring the (tiny) shear force between the air and the duct. An alternative is to use the Sutherland equation of state http://jullio.pe.kr/fluent6.1/help/html/ug/node294.htm (bottom formula) which treats air as an ideal gas. Or, you can always just look it up in a table.

>>11364496
I mean, you could just look up the viscosity in a table. To actually measure viscosity is more complicated and you will need some method of measuring the (tiny) shear force between the air and the duct.

>>11364225
Depends on context. In quantum [math]\langle u|[/math] is a row vector and [math] |v\rangle [/math] is a column vector. So [math] \langle u|v\rangle [/math] is an inner product (look up bra-ket notation.
In material science [math]\langle x_1x_2x_3\rangle[/math] is the set of all direction vectors that are crystallographically equivalent [math](x_1 x_2 x_3)[/math] by symmetry

>>11100835
>is a democrat
>posts in retard-tier wojak IQ racebait garbage threads
Checks out