Time Remaining: 02:52:53 Hide previous 8 of 11 net Problem 7.20 Part A A very sm

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Time Remaining: 02:52:53 Hide previous 8 of 11 net Problem 7.20 Part A A very small 100-g object is attached to one end of a massless 10 cm rod that is pivoted w without friction about the opposite end The rod is held vertical, with the object at the top, and released, allowing the rod to swing What is the speed of the object at the instant that the rod is horizontal? O 0.71 m's O 2.8 mis O 2.1 m/s O 4.0 m's O 1.4 m/s Submit My Answers Give Up Provide Feedback O . E https//session, masteringphysics.com/myct/itemView assignmentProblemiD-471004958 http://ess on mastering hysics.com / myct/ite meassignmentProble m D-47100495&

Explanation / Answer

When the rod is horizontal, the mass has descended by height h = L =10 cm = 0.1 m

So, the potential energy lost in the process,

Up = mgh = mgL

Now, this energy is converted to Kinetic energy,

So, mgL = 0.5*mv^2

So, v = sqrt(2gL) = sqrt(2*9.8*0.1) = 1.4 m/s <-----------answer

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