The 1.12-kg uniform slender bar rotates freely about a horizontal axis through o. the system is released from rest when it is in the horizontal position θ = 0 where the spring is unstretched. if the bar is observed to momentarily stop in the position θ = 56°, determine the spring constant k. for your computed value of k, what is magnitude of the angular velocity of the bar when θ = 40°.

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented