Jet, I am getting a little suspicious of what you are up to. This is your fourth question this week and they all sound like basic aviation school questions. Getting unstuck on occasion on the one hand, and freeloading brain cells from the internet to avoid having to think are two different things. Try to solve the problems yourself first, and then if you have some doubts then make a question aimed at exploring what the area of uncertainty is. Homework problems are not unwanted nuisances, they are an opportunity to learn things that will save your butt later. You need to work them.