A student group is conducting a lab to determine the variables that affect the period of a pendulum motion. The group identified three variables to test: the length of the pendulum, the mass of the pendulum bob, and the displacement angle of the swing. Answer the following questions about this experiment. -Explain how the period of the pendulum is measured. Identify the instruments that may be used to measure period, and comment on uncertainties in measurement. -The group first conducts an experiment to test the effect of the length of the pendulum. Identify the independent variable, the dependent variable, and the controlled variables in this experiment. -Sketch the expected shape of the period versus length graph. -Next, the group tests the effect of the mass of the bob on the period. Based on your knowledge of the pendulum, make all the necessary calculations and fill in the missing data in this table: Mass of Bob (g) Period (s) 10. 20. 30. 0.76 40. 50. Angle of swing= 20. 0 , and the Length of the pendulum= m -Because of budgeting issues, the students did not test the effect of the gravitational field on the period of the pendulum. Based on your knowledge of a pendulum, sketch the shape of the graph of period versus the square root of the gravitational field.