Something humans can use in geosphere

An object weighs 40n in air , weighs 20n when submerged jn water and 30n submerged in a liquid of unknown density .what is the density of the liquid?

The people of mozambique and zimbabwe would be most likely to be affected by a change in flow of which of these rivers? a) congo b) niger c) nile d) zambezi

Which of the following studies is linked most directly to the establishment of the national research act in 1974 and ultimately to the belmont report and federal regulations for human subject protection? a. the public health service tuskegee study of untreated syphilis in the negro male. b. stanford prison experiment (zimbardo).c. tearoom trade study (humphreys).d. the harvard t3 study.