Pendulum. A small rock with mass 0.20 kg is fastened to a mass less string by length 0.90 m to form a pendulum. The pendulum is swinging so as to create a maximum angle of 45° with the vertical. Air resistance is negligible.
1. What is the tension in the string as it passes during the vertical?
2. What is the speed of the rock when the string passes during the vertical position?
3. What is the tension in the string when it makes an angle of 45° with the vertical?