A machine produces compression waves in a spring that is 120 cm long by pulsing twice every second. The back and forth movement of the pulse creates compressed sections of the spring that are 30 cm apart and travel toward the other end of the spring.

hail is a solid form of precipitation composed of large, layered ice particles called pellets that often have spherical shapes. this phenomenon occurs during thunderstorms in the could type known as cumulus

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answer; (arch); good luck

measure their densities same density, same sub