Hot air balloon a is rising upward a rate of 5.0 m/s. a passenger aboard balloon a observes balloon b rising upward at a relative rate of 7.5 m/s. what is the velocity of balloon b relative to the ground? assume that up is positive.

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

graph slopes whilst gas cools, then it is flat whilst conensation to liquid happens, the coolong liquid then graphs as a slope when it solidifies graph is flat

latent heat