If in an elliptical orbit, rp/ra = 0.5, what is the eccentricity of the orbit?

Atown is considering building a biodiesel power plant that would burn biomass to generate electricity. which of the following correctly lists an advantage and a disadvantage of this project?

Dry ice is solid carbon dioxide that is used in the transport of food and medicine. dry ice becomes a gas at –78.5°c without becoming a liquid first.

Which type of microscope would allow the viewer to see ribosomes inside a cell?