Question

The length of second's pendulum is 80cm. What should be the
length, if time period is 1.6 sec?​

Answer 1

Answer:

Given

length of seconds pendulum = 80cm

Time period = 1.6 seconds

Time period

T = 2π √l/g

Now , squaring on both sides

T² = 4π ( l / g )

T²g = ( 4π² ) l

T²g / 4π² = l

l = T²g / 4π²

Here ,

length = 80cm

g = 9.8

π = 3.14

length = 80cm