Stars are classified on the HR diagram by two characteristics. What are they? A- temperature in color
B- Luminosity and brightness
C- temperature and luminosity​

How would doubling the made of an object change the objects potential energy

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?

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.