If you need help with a current homework (or alike) problem please go here: https://www.physicsforums.com/forums/homework-and-coursework-questions.152/ This forum stores all the unanswered requests from the Introduction Physics Homework forum pre 2015. We created this warehouse for a couple reasons: Members are always asking for practice problems and for challenges Unanswered homework threads provide no value and can actually harm. Nearly 50% of traffic to PF lands on homework threads. If a guest lands on a thread with no replies it looks poorly and the guest is not helped. PF becomes a knowledge base when a thread is older than a few months. Members are free to work on these older homework threads. Know that none of these problems are relevant to the OP because of their age. So it's best not to ask the OP questions because they likely won't respond, but they may. The point is that you should work with what you are provided to solve the problems without the OP's input. Members are encouraged to collaborate with others within the thread. Creative and alternate methods are also encouraged. Full solutions are acceptable. To keep this forum list fresh we will be transferring threads with replies back into the main homework forum. There it will be valuable when guests land on it or when members find it via search. On the other hand threads that overtime do not receive any interest will be removed completely. Keep in mind this list has not been thoroughly vetted. Some threads may have issues that require it to be removed. Please report them. Also note that pre 2009 there was no homework template.