- 50

- 0

**1. Homework Statement**

A piston 10 is coaxially in diameter moves within a cylinder whose inner diameter is 10.006 in;

The annular space between piston and cylinder is filled with oil having a kinematic viscosity is 0.004 feet ^ 2 / s and specific gravity of 0.85

If the piston makes its way with a speed of 30 ft / min and the length of the piston within the cylinder is 10 feet, calculate the shear force and the friction opposing the motion of the piston

**2. Homework Equations**

(tangencial force) / area = (dynamic viscosity) (velocity/space betwteen the two surfaces)

**3. The Attempt at a Solution**

I can know the dynamic viscosity of the equation

**kinematic viscosity = dynamic viscosity/density**and the density it can be known from the specific gravit.

So if I draw a Diagram of piston, I have two tangent forces and the weight. But I know that (tangencial force) / area = (dynamic viscosity) (velocity/space betwteen the two surfaces) and the area of contact it can be calculated from 2(pi)(radio) (Lenght)???

Last edited by a moderator: