What is the mass of a 7.91 cm3 peice of lead having a density of 11.34

How does the viscosity of magma change as magma cools?

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions

What is the typical rotational frequency frot for a molecule like n2 at room temperature (25∘c)? assume that d for this molecule is 1å=10−10m. take the total mass of an n2 molecule to be mn2=4.65×10−26kg. you will need to account for rotations around two axes (not just one) to find the correct frequency. express frot numerically in hertz, to three significant figures.