The 1.34-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 = 53°, determine the spring constant k. for your computed value of k, what is magnitude of the angular velocity of the bar when θ = 31°.

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.