A 34 cm -diameter conducting sphere is charged to 500 V relative to V=0 at r=∞? What is the surface charge density σ?
Express your answer using two significant figures.

At what distance from the center of the sphere will the potential due to the sphere be only 22 V ?
Express your answer using two significant figures.

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same

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.

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation