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Q. Suppose one speaker is driven at 578 Hz and the other at 561 Hz. What is the beat frequency in Hz? The average frequency in Hz?

Q. A 430 g block is at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.640, and the coefficient of kinetic friction is 0.300. A force of magnitude P pushes the block forward and downward as shown in the figure below. Assume the force is applied at an angle of 24.0° below the horizontal.

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