A student throws a set of keys vertically upward to his fraternity brother, who is in a window 4.20 m above. The brother's outstreched hand catches the keys 1.80 s later. (a) With what initial velocity were the keys thrown

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?

Which is the most accurate name for the covalent compound p2o3?

Acertain sound is recorded by a microphone. the same microphone then detects a second sound, which is identical to the first one except that the amplitude of the pressure fluctuations is larger. in addition to the larger amplitude, what distinguishes the second sound from the first one? it is perceived as higher in pitch. it is perceived as louder. it has a higher frequency. it has a longer wavelength.