Why are satellites placed into orbit at least 150 km above earth’s surface?

to avoid air resistance
to match earth’s curvature
to create inertia
to increase friction

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.