You are traveling upward in a hot air balloon. Explain to me what changes as you go through each layer of the atmosphere. Mention things like temperature, pressure, adjustments you will have to make to survive, etc.​

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.