The uniform semicircular bar of radius r = 80 mm and mass m = 4.0 kg rotates freely about a horizontal axis through the pivot O. The bar is initially held in position 1 against the action of the torsional spring and then suddenly released. Determine the spring stiffness kT which will give the bar a counterclockwise angular velocity ω = 4.1 rad/s when it reaches position 2, at which the spring is undeformed.

answer; i believe the correct answer is (40,000 j) good luck

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radial fractures in a piece of glass look most like which of the following?

a. spokes of a wheel

b. a circle

c. a zig zag

d. none of the above

the correct answer is a. spokes of a wheel

hope this (: