### How much work is finished by gravity

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Q. The acoustical system is driven by speaker emitting a 432Hz note. If destructive interference occurs at a particular instant, by what least amount amount must the difference of two path lengths in the U-shaped tube be increased so as to hear constructive interference?

Q. A crate of mass 14.00 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline that makes an angle of 19.50° with the horizontal. The coefficient of kinetic friction is 0.40, and the crate is pulled 5.25 m.
How much work is finished by gravity?

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