Asound wave of wave length .8 m and a velocity of 330 m/s is produced for .5 s what is the frequency of the wave

An object of dimensions 50 cm x 40 cm x 0.20 cm has a mass 60g. find its density in g/cm3 and kg/ m3

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Marvin records scientific data about lake superior. for which property has marvin forgotten to use an si unit of measurement? shore length high temperature low temperature annual precipitation