9. 5.56/11.12 points| Previous Answers Gancoli? 6.P090 My Notes Ask Your Teacher

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9. 5.56/11.12 points| Previous Answers Gancoli? 6.P090 My Notes Ask Your Teacher A ball is attached to a horizontal cord of length L whose other end is fixed, as shown below. (a) If the ball is released, what will be its speed at the lowest point of its path? (Use the following as necessary: g and L.) (b) A peg is located a distance h directly below the point of attachment of the cord. If h-0.71 L, what will be the speed of the ball when it reaches the top of its circular path about the peg? (Use the following as necessary: g and L) 0.58gLx Submit Answer Save ProgressPractice Another Version

Explanation / Answer

B) By conservation of energy

0.5mv^2 = mgH where H =h-(L-h) = 0.71L-(L-0.71L)= 0.42L

v = sqrt(2gH)

= sqrt(0.84gL) answer

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