a ball rolls off of a desk that is 0.97m off of the ground and strikes the floor 0.76m away from the desk. how far was it rolling before to falling off of the desk? (acceleration of gravity is 9.81)

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm(red) and 486 nm (blue). light from a hydrogen lamp illuminates a diffraction grating with 520lines/mm , and the light is observed on a screen 1.5m behind the grating. part a what is the distance between the first-order red and blue fringes? express your answer to two significant figures and include the appropriate units.

Which branches of natural science include the study of an organism that lived 10 million years ago

How to tell if a molecule is polar or nonpolar with electronegativity