Agear of inner and outer radii 25 mm and 125 mm, respectively is shrunk onto a hollow shaft of outer radius 25.05 mm. both members are made of steel with e = 200 gpa, v = 1/3, and rho = 7.8 kn. s^2/m^4. if the assembly is to rotate, calculate

(a) the speed in rpm at which the interface pressure becomes zero, and
(b) the maximum stress at this speed. you may neglect the radial displacement of the shaft.

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature

Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan