A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. When a 41.5-gram mass is attached at the 28.5-cm mark, the fulcrum must be moved to the 39.2-cm mark for balance. What is the mass of the meter stick

The value is  

Explanation:

From the question we are told that

    The first  position of the fulcrum  is  x = 49.7 cm

    The mass  attached is

    The position of the attachment is    

    The second position of the fulcrum is  

Generally the sum of clockwise torque =  sum of anti - clockwise torque

So  

Here CWT  stands for clockwise torque

So

=>  

=>    

vapour or gas assuming atmospheriv pressure