Approach. Read problem carefullyWrite down all the symbols for all the relevant quantities using standard notation (can be in the form of an equation)Write down the symbol for the unknown Write down relevant equations that connect the unknown to the given quantities. See if you have sufficient information to solve the problemSolve the problem using symbols(Check if result is physically correct by considering appropriate limits)Plug in the values of the symbols to obtain the answer to 3 significant figures. Include units. .