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  1. R

    Calculating gear teeth

    Homework Statement I wonder if anyone can point me in the right direction as to where to start with this problem. There are 3 gears A sun gear which is in the centre with 45 teeth, pitch 15mm and revolves at 63rpm CW This drives an arm which connects the sun gear to a planet gear, the...
  2. R

    Fracture Mechanics

    Hi everyone, I have a problem that I hope someone can help me with, the question is. A mass of 500kg induces a tensile stress in a glass sheet restrained at the top. Given that the fracture strength of sound glass is 170MPa what is the maximum length of slit that can be tolerated without...