The graph below plots the temperature and luminosity of stars on the main sequence.
which of these stars had an initial mass greater than the initial mass of the sun?
star 1 and star 2
star 3 and star 4
star 1 and star 4
star 2 and star 3

Wind and moving water provide energy. question 1 options: chemical mechanical thermal none of the above

A6.0-μf air-filled capacitor is connected across a 100-v voltage source. after the source fully charges the capacitor, the capacitor is immersed in transformer oil (of dielectric constant 4.5). how much additional charge flows from the voltage source, which remained connected during the process?

During cooling, the kinetic energy of the molecules falls. why does this happen? a. the motion of the molecules increases. b. the motion of the molecules slows down. c. the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.