Physics

Problem

An unequal-arm beam balance has left and right arm lengths of

20\,\text{cm}

and

25\,\text{cm}

respectively. An unknown mass is placed on the

20\,\text{cm}

arm, and a standard mass of

100\,\text{g}

is placed on the

25\,\text{cm}

arm to obtain balance. What is the value of the unknown mass? a)

80\,\text{g}

150\,\text{g}

125\,\text{g}

100\,\text{g}