What is the area of a circle of radius 28.77 m ? Express your answer using four significant figures and include the appropriate units.

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

Gunpowder residue is most likely to show up where on a shooters hands

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.