Question

A pendulum whose length is 36cm has time period 1.25 find the time period of another pendulum whose length is 81 cm​

Answer 1

Answer:

T = 2pie✓l/g

T directly proportional to √ l

t1/t2= √ l1/l2

1.25/t2= √ 36/81

1.25/t2= 2/3

1.25*3/2= t2

1.875= t2