A rod is bent into an L shape and attached at one point to a pivot. The rod sits

Question

A rod is bent into an L shape and attached at one point to a pivot. The rod sits on a frictionless table and the diagram is a view from above. This means that gravity can be ignored for this problem. There are three forces that are applied to the rod at different points and angles: , , and . Note that the dimensions of the bent rod are in centimeters in the figure, although the answers are requested in SI units (kilograms, meters, seconds). The length X is 7 cm and Y equals 4 cm. The forces are in newtons. The moment of inertia for the L beam is 7 kg
1.What is the clockwise moment about the pivot if F2 equals 20 newtons?
2.What is the angular acceleration of the L beam? F3 = 0 newtons
3. Find the time to rotate 1.4 revolutions. F3 = 0 newtons
4.If F1 equals 9 newtons and F2 equals 0, what is the magnitude of F3 if the beam is in rotational equilibrium?

Explanation / Answer

T1= T2 for equilibrium r x F1 = r x F2 (.03m)(12) = (.08m)(F2) F2 = 4.5 N ?? = at ?? = change in angular velocity a = angular acceleration t = time

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