A disk of radius R rotates at an angular velocity 2 inside a disk-shaped container filled with oil of viscosity u, as shown in Fig. PI.59. Assuming a linear velocity profile and neglecting shear stress on the outer disk edges, derive a formula for the viscous torque on the disk.

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Q: 35 MPa 14.6 ksi 25 MPa 9.3 ksi 75° 650 7.4 ksi FIGURE P12.7 FIGURE P12.8

A: Given Details:

Q: 10' 10' B 30 kips A 14' w = 2 kips/ft + -14'- C

A:

British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.