come on please help me with pendulums?

Question

1. What effect does doubling the length of the pendulum cord have on its period?

2. What effect does reducing the length of the pedulum cord by one-helf have on its period?

3.Determine the length of pendulum cord needed in order to result in a period (T) of precisely 5 seconds.

Answer 1

T = 2π√(L/g)

1. Increases the period by a factor of √2.
2. Decreases the period by a factor of √2.
3. L = gT²/(4π²) = 9.8*56.206 m /4π² = 6.206 m

Answer 2

The answer is available on many web sites about pendulums. Use the equation to get the number you need.