The water side of the wall of an 80-m-long dam is a quarter circle with a radius of 8 m. If the water has a density of 1000 kg/m3 throughout, determine the hydrostatic force on the dam and its line of action when the dam is filled to the rim.

Iwas going to ask that quesytion  sorry dude i dont  know : (    : /

Jenny and fred both play a long note on their trombones. a stationary observer hears the sound increasing and decreasing repeatedly in loudness. which of these must be true? the sound waves from the two trombones have slightly different frequencies.the sound waves from the two trombones have the same frequency.the sound waves from the two trombones have slightly different amplitudes.the sound waves from the two trombones have the same wavelength.the sound waves from the two trombones have slightly different velocities.  lolthe answer is          the sound waves from the two trombones have slightly different frequencies.

What are the