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10 Nov 2019

2- A pendulum of mass M and length L is released from rest froman angle of 90° with respect to the vertical. Thegravitational potential energy is zero at the lowestpoint. Ignore friction. Data: M=O.4 Kg, L=0.5 m, g=9.8rm/s2•

d) Find the tension at A, B and at the initialposition.

e)Now consider the problem with friction. If the work of thefriction force was one fifth of the initial energy, what would bethe value of the speed at the lowest point of thetrajectory? (be careful with the sign of W!)

I really need help with this question. This picture shouldclarify the problem above.

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Nestor Rutherford
Nestor RutherfordLv2
13 Apr 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A 25 kg child on a 2m long swing is released from rest when the ropes of the swing make an angle of 30 with the vertical. (a) neglecting friction, find the child's speed at the lowest position . (b) If the actual speed of the child at the lowest postion is 2.00 m/s, what is the mechanical energy lost due to friction?

A system consists of a vertical spring with force constant k = 1190N/m, length L = 1.80 m, and object of mass m = 5.40 kg attached tothe end. The object is placed at the level of the point ofattachment with the spring unstretched, at position yi = L, andthen it is released so that it swings like a pendulum.

(a) Write Newton's second law symbolically for the system as theobject passes through its lowest point. (Note that at the lowestpoint, r = L - yf. Do this on paper. Your instructor may ask you toturn in this work.)

(b) Write the conservation of energy equation symbolically,equating the total mechanical energies at the initial point andlowest point. Do this on paper. Your instructor may ask you to turnin this work.)

(c) Find the coordinate position of the lowest point.
m

(d) Will this pendulum's period be greater or less than the periodof a simple pendulum with the same mass m and length mass L?
longer
shorter


(e) Explain your answer.

A system consists of a vertical spring with force constant k = 1190N/m, length L = 1.80 m, and object of mass m = 5.40 kg attached tothe end. The object is placed at the level of the point ofattachment with the spring unstretched, at position yi = L, andthen it is released so that it swings like a pendulum.

(a) Write Newton's second law symbolically for the system as theobject passes through its lowest point. (Note that at the lowestpoint, r = L - yf. Do this on paper. Your instructor may ask you toturn in this work.)

(b) Write the conservation of energy equation symbolically,equating the total mechanical energies at the initial point andlowest point. Do this on paper. Your instructor may ask you to turnin this work.)

(c) Find the coordinate position of the lowest point.
m

(d) Will this pendulum's period be greater or less than the periodof a simple pendulum with the same mass m and length mass L?
longer
shorter


(e) Explain your answer.

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