1 You are exploring a new planet, Chyspis, which you have determined has a radius of 7.2 x 10 m. With you, you have a string and a small object. You suspend the object from the string, and observe that small-amplitude pendulum swings have a period of 2.2 s. You then launch the object at an angle 25 above the horizontal from shoulder-height (1.40 m) with a velocity of 30 m/s; it hits the ground 60.36 m from you. Assume the ground is level and ignore atmospheric resistance. (a) Determine the mass of planet Chyspis. Hint: consider gravity. (b) Determine the length of the string you used in your pendulum.