The stress across a surface element (yellow disk) is the force that the material on one side (top ball) exerts on the material on the other side (bottom ball), divided by the area of the surface.
Overview. The WR450F retails for $8,290, making it the sixth-most expensive 450cc 4-stroke enduro bike of 2013. It comes equipped with a 449cc engine, which is slightly larger than average for a 4-stroke motor.he WR450F retails for $8,290, making it the sixth-most expensive 450cc 4-stroke enduro bike of 2013.
At $92,500, the Confederate B120 Wraith is one expensive bike. To give you an idea, the true price of a BMW 5 series is around $45,000, so twice the cylinders and half the price of the Wraith. Its engine is actually surprisingly dinky. It has only two cylinders providing 125 hp.