Answer:183.94 N
Explanation:
Given
Time Period 
mass of child 
Radius 
Velocity 
Now Centripetal Force will be Balanced by Frictional Force
Centripetal Force 
therefore Friction Force is 183.94 N
Answer:
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D. I hope my answer helps you!
Answer:
D) Repeating the experiment several times and comparing the results
Explanation:
Replication of experiments allows scientists to see patterns and trends in the results of the experiments. It helps the scientist performing the experiment to see if there is precision in the results gotten and to test the integrity of the data. The results of several repetitions of the experiment can be compared and tested for consistency.
Performing this experiment severally will make the scientist know whether the dissolved oxygen contents gotten in each of the tanks are close to each other. If the results are wide apart, then the data lacks integrity and should not be used.
