An object will not lose its blank as it moves away from earths surface, but it will lose blank

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

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?