Question
Question: A meter scale is balanced at its mid point if a 20N weight is balanced at 20 cm mark and a 30 N weig...
A meter scale is balanced at its mid point if a 20N weight is balanced at 20 cm mark and a 30 N weight is hanged at x cm mark. Calculate the value of x.
A
20 cm
B
70 cm
C
30 cm
D
80 cm
Answer
70 cm
Explanation
Solution
m1g = 20N ; m2g = 30N ̃ m1gl1 = m2gl2
\ 20×30 = 30l2 ; \ l2 = 20 cm ;
\x= (50+20) = 70 cm