Problem 1: The 1.2-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 0 = 0 where the spring is unstretched. (a) Calculate the reactions at the support o and the acceleration of the center of gravity of the bar upon release. If the bar is observed to momentarily stop in the position 0 = 50° (b) determine the spring constant k. For your computed value of k, what is the angular velocity of the bar when 0 = 25°?

Problem 1: The 1.2-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 0 = 0 where the spring is unstretched. (a) Calculate the reactions at the support o and the acceleration of the center of gravity of the bar upon release. If the bar is observed to momentarily stop in the position 0 = 50° (b) determine the spring constant k. For your computed value of k, what is the angular velocity of the bar when 0 = 25°?

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter10: Virtual Work And Potential Energy

Section: Chapter Questions

Problem 10.60P: The weightless bars AB and CE, together with the 5-lb weight BE, form a parallelogram linkage. The...

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Question

B
Problem 1: The 1.2-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 0 = 0 where the spring is unstretched.
0.6 m
(a) Calculate the reactions at the support o and the
acceleration of the center of gravity of the bar upon
release.
If the bar is observed to momentarily stop in the position 0 = 50°
A
1.2 kg
0.6 m
(b) determine the spring constant k. For your computed value
of k, what is the angular velocity of the bar when 0 = 25°?
0.2 m

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