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/sci/ - Science & Math

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3192524 No.3192524 [Reply] [Original]

How can I get the height?

>> No.3192532

How can i finish my homework before the summer break when i'm retarded?

>> No.3192538

The hint tells you exactly what to do.

>> No.3192540

>>3192532

How about being helpful instead?

@ 60 degrees = 3 cos 60 = 1.5,
height= 3-1.5= 1.5m

@ 30 degrees = 3 cos 30 = 2.59
height= 3-2.59 = 0.41m

>> No.3192551

>>3192540
EK?

>> No.3192562

>>3192551

The formula should go something like Epi + Eki = Epf + Ekf

Epi being mass*g value*height
Ek being 0.5*inertia*(w)^2

mass and inertia are constant, cancel them, you have 0 Ek at the initial position and 0 Ep at the final position.

Substitute and solve for angular velocity.

>> No.3192566

Calculate the moment of inertia. The total energy is a sum of gravitational potential energy (simple function of the height of the center of mass) and rotational kinetic energy (simple function of moment of inertia and angular velocity), and is conserved.

>> No.3192571

>>3192562
what?
I...nevermind.