Question

The length of seconds pendulum is 100cm. To have half of this value the length is to reduced by

Answer 1

Answer:

T1

=2s; l

1

=100cm; T

2

=1.4s; l

2

=?

T

2

T

1

=

l

2

l

1

∴

1.4

2

=

l

100

Squaring both sides, we get:

1.96

4

=

l

2

100

⇒l

2

=

4

100×1.96

=49.0 cm