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A prismatic block of mass m is kept on a...

A prismatic block of mass `m` is kept on a groove . The bottom line of the groove makes an angle `theta` with horizontal . The angle between the flat surface 1 and 2 making the groove is `phi` If the groove is symmetrical with the normal to the inclined plane containing the bottom line of the groove

a. Find the coefficient of friction `mu_(0)` between the block and groove so that the block begins to slide.
b. If `mu gt mu_(0)` find the friction force on the block.
c. If `mu lt mu_(0)` find the acceleration of the block.

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