A lumberjack is traveling down a river with a number of trees he has cut down. H

Question

A lumberjack is traveling down a river with a number of trees he has cut down. He is bored and cannot sing because he lost his voice, so he decides to start running on one of the non-rotating in the water. The log can be treated as a disk (moment of inertia 1/2 MR^2). The log has a radius of 45.0 cm and a mass of 8.0 times 10^2 kg. His foot exerts a tangential force on the log 4.2 times 10^2 N while in contact with the log. The frictional torque due to the water is 20.N m. What is the magnitude of the torque the lumberjack exerts on the log? What is the magnitude of the angular acceleration of the log? After 5 seconds what is the magnitude of the angular speed of the log? After 5 seconds what is the energy of the rotating log (assuming it spins in place because he is running in a direction opposite the current)?

Explanation / Answer

Point estimate is the width of the confidence interval.

i.e. Width = Upper limit - Lower limit

= 5.1% - 2.5%

= 2.6%

The Point Estimate is 2.6%

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