What are the TWO conditions for a system to be in mechanical equilibrium?

What happens to the velocity of the car when the upward pull of the cable is greater than the downward pull of gravity as the car rises toward the top?

What is the freezing point of radiator fluid that is 50% antifreeze by mass? kf for water is 1.86 ∘c/m.

Does heating a metal wire increase or decrease its electrical resistance? why?