Question

If the length of second pendulum is increased by 4% what will be the new time period

Answer 1

we know that effective length of second pendulum is 1 metre and its time period is 2 sec...

New effective length=1m+25% of 1m
=1.25 m

We know from relation :-
t=
$2\pi \sqrt{1.25 \div 9.8}$
which will be equal to 2.242 seconds