A flash of red light and a flash of blue light enter a glass cube perpendicular to its surface at the same time. After passing through the block, the pulse exits first.

Depending on how the continental plates move it can cause a continental scale shift.

Pe = 1/2k(x)^2  and .05n/m = .05x10^-9m = x 

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.