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Statement of a problem № 67

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A bar of mass m is pulled by means of a thread up an inclined plane forming an angle α with the horizontal (Fig. 1.13). The coefficient of friction is equal to k. Find the angle β which the thread must form with the inclined plane for the tension of the thread to be minimum. What is it equal to?

Solution:
A bar of mass m is pulled by means of a thread up an inclined plane forming an a

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