A short, hollow cast iron cylinder with a wall thickness of 1 cm is to carry a compressive load of 10 tonnes. If the working stress in compression is 800 kg/cm2, the outside diameter of the cylinder should not be less than
a) 0.5cm
b) 5 cm
c) 2.5cm
d) 4.5 cm
a) 0.5cm
b) 5 cm
c) 2.5cm
d) 4.5 cm