Hi, I need help on 3 questions that will be given in the attachment with the equation. It is about pendulums, look at the attachment for all the information. Please help and thanks in advance
For part (d), you're given the time, and you want to find the length, so plug in 10 for T:
$\displaystyle 10 = 2\pi \sqrt{\frac{L}{9.8}}$
Divide both sides by 2π, square both sides, and multiply both sides by 9.8 to find L.
For part (e), is the weight of the pendulum mentioned anywhere in the equation? What does that tell you?