A Rope Is Tied to a Large Crate,which Is Sitting

question 20

Multiple Choice

A rope is tied to a large crate,which is sitting on a flat surface.The coefficient of static friction between the crate and the ground is 0.9.If a person is to pull on the rope with the minimum force needed such that the crate begins to slide,the angle between the rope and the ground should be

• A)greater than 0 degrees but less than 90 degrees.
• B)0 degrees (rope is horizontal).
• C)90 degrees.

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