4. If the same pendulum in number 3 completes a cycle in 2.0 s in an unknown planet, calculate the (a) acceleration due to gravity on the planet; (b) frequency of the pendulum on the planet; (c) maximum velocity of the pendulum on the planet. 5. A 450 gram-uniform rod has a length of 40 cm and acts as a physical pendulum. An 800-kg sphere is attached at the other end of the rod. Determine the frequency of the rod