Hi I have parts A, B, C, D done but need help solving part E, thank you. SECTION

Question

Hi I have parts A, B, C, D done but need help solving part E, thank you.

SECTION 2 A simple pendulum is shown a mass of F 2.6 kg suspended from the ceiling by means of a string of length G 2 q m. Assume that the acceleration due to gravity is g 10 m/s2, and that there is no friction or air resistance. (a) Suppose you were to release the pendulum from rest, starting from an angle 0 H. 4S.Y o with respect to the vertical, as shown. What will be the speed of the pendulum at the instant it swings through its lowest point (that is, when it's m/s momentarily hanging vertically)? Answer: (b) Assuming the same situation as in part (a), what will be the speed of the pendulum at the instant it reaches an angle of 30 above the vertical? Answer: m/s

Explanation / Answer

Use work energy theorem for this part, change in total energy = work done by friction

m(v^2)/2 - mgl(1-cos(theta)) = 1 joule

(3.6*2.2^2)/2 - 3.6*9.81*2.9(1-cos(theta)) = 1

Theta =23.07

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