A pendulum can be used by space explorers as a simple way of measuring the strength of the gravitational field (g) on the surface of other worlds. Suppose the pendulum they are going to use completes one vibration in 1.50 4 0101 seconds on the surface of Earth. On the surface of a world in another solar system, the space explorers make the following measurements for the period of vibration of the pendulum: 0.83, 0.84, 0.88 seconds. 212 a. What is the strength of the gravitational field on the surface of that world? Include the uncertainty in the result. b. How would you reduce the uncertainty in the result? c. Which of the three kinds of experiments is this? How do you know? What important features of this kind of experiment are missing