(5) The device shown consists of a disk that is rotated by a shaft. The disk is positioned very close to a solid boundary. Between the disk and boundary is viscous oil. (a) If the disk is rotated at a rate of I rad/s, what will be ratio of the shear stress in the oil at r=2 cm to the shear stress at =3 cm? (2 pt) (b) If the rate of rotation is 2 radis, what is the speed of the oil in contact with the disk at r=3 cm? (2 pt) (e) If the oil viscosity is 0.01 N-sm' and the spacing y= 2 mm, what is the shear stress for the conditions noted in part (b)? (2 pt) (d) What torque is required to rotate the disk at a rat viscosity and conditions as in part (cy? (4 pt) of 2 rad's, with D=8 cm, and with the same Disk Oil.