How long does the string have to be in order to produce a first harmonic
of 220 Hz on a guitar? The speed of
the wave is 435 m/sec.

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.

it breaks and dirupture other materials and other sencews from the bottom