Best Lab Equipment

Here are some more information for Torsion Balance:

Best Longboard Skateboard - Factors To Consider When Selecting A Longboard

Generally, longboard skateboards are larger and wider in shape and have better concavity than other standard skateboards, however you can find longboard skateboards in different shapes to suit different styles of skateboarding. Since the size of longboards skateboards are comparatively larger, the rider can avail of more momentum and ride fluidly. The trucks are also an important part of the skateboard and need to be of high quality and light weight, so that the rider can enjoy his or her ride. When selecting the best longboard skateboard make sure that the trucks are of high quality, as these attach the wheels to the board and enable the rider to steer the board. The board turns in the direction in which the rider leans, and the bushings inside the trucks are responsible to bring the trucks back into a straight position. The kingpin inside the bushings of longboard trucks is laid at a more acute angle to the deck so that it can be easily tightened for more control and loosened for better turning. Not only do the best longboard skateboard provide you with torsion trucks that operate differently and more efficiently than regular trucks, but the longboard also has torsion trucks to make the turns easier. Depending upon your needs, you can choose the best longboard skateboard, since these days a variety of longboard skateboards are easily accessible online.

The wheels of longboards are also a vital factor in deciding as to which longboard would prove to be the best longboard skateboard since different styles of skateboarding demand different sizes and hardness of wheels. Mostly longboard skateboards have larger wheels that have to spin slower to maintain the speed than compared to smaller wheels. Larger wheels can also roll over cracks in the street owing to its incredible size which otherwise would crack or break in the case of smaller wheels. The best longboard skateboard would surely include larger wheels, but may vary in hardness. To ride at a fast speed you would need to have a better grip so that you don't loose your balance. Select the best longboard skateboard with large and soft wheels if it suits your skateboarding style, otherwise you can go in for longboards with large and hard wheels that prove to be the best longboard skateboards for vert skating, as it involves higher speed which with hard wheels can be maintained on the ramps as well.

Lastly, bearings of longboard skateboards also need to be considered when selecting the best longboard skateboard, as this is the part of the skateboard that decides the efficiency of wheels. Longboard skateboard can have bearings either made of steel or of ceramic which may cost more, but has many advantages like light weight, resistant to rust, durable and creates less friction when skateboarding. When looking for longboard skateboards consider all the essential factors, so that you can select the best longboard skateboard for you and your skateboarding style. Enjoy skateboarding!

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Rotor stress calculations?

How do you visualize and calculate stress in rotating masses?

You forgot to tell us the density.
Also, I don't know what RCF = 1.12r (RPM/1000) squared means.

Assume a solid disk with no central hole

Max tensile stress (at center)
= (rho omega^2/8) (3+ nu) r^2

Assume rho = 8000 Kg/m^3 for stainless steel

omega = 25000 x 2 pi / 60 = 2618 rad/sec

E/G = 2(1+nu)
2(1+nu) = 193/77 = 2.506
nu = 0.253

Max stress = (8000 x 2618^2 / 8 ) (3.253) r^2
= 2.23 x 10^10 r^2 Pa

2.23 x 10^10 r^2 = 515 x 10^6
r = 0.152 m

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