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A 2 cm cube o some substance has its upp...

A 2 cm cube o some substance has its upper face displaced by 0.15cm due to a tangential force of 0.3 N Calculate the rigidity modulus of the substance.

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Side of cube, `a=2.0cm=2xx1-0^(-2)m`
`therefore"Area,"A=4xx10^(-4)m^(2)`
Displacement of upper layer =0.15cm
`=0.15xx10^(-2)m`
Tangential force,`F=0.30N`
Rigidity modulus,`eta=(F)/(A)*("x")/(Delta"x")`
`=(0.30)/(4xx10^(-4))(2xx10^(-2))/(0.15xx10^(-2))`
`thereforeeta=(0.60xx10^(4))/(0.60)=1xx10^(4)N//m^(2)`
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