What are black dwarfs?
a) cooled off white dwarfs that no longer glow visibly
b) pulsars that have slowed down and stopped spinning
c) the lowest mass main sequence stars
d) objects that are not quite massive enough to be stars
e) the end result of massive star evolution

Calculate the amount of heat produced when 18000 coulombs of charge is transferred in one hour through a potential difference of 50v

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Which is an example of an exothermic process?