serious math help needed!! hello, first off i would like to say that im new here, and this being my first post, so if i did something wrong, don't flame me. im a designer by trait and im currently trying to build something but unfortunately its completely out of reach of my math skills, so thus why i seek help from all you professionals. what i need to find answeirs to are the following questions. however if what i post does not give enough info please let me know so that i can provide everything you need to figure out my problem. ok here goes: im building a homemade dynameter for my pocket bikes. unfortunately they do make these so im designing one my self. so what i need to find out is this: i have a 10" (outsidediameter) drum that wieghs 60lbs, i need to know if you can find the rpms of the motor spining it by how long it takes to spin the drum from 0 - 30mph. also i need to find the horse power the motor has by using this. so here it is. the drum (10" outside diameter) wieghs 60lbs what is the rpms of the motor spinning by moving it in the (TIME) it takes to go from 0-30mph. once the rpms are achieved can i find how much horse power the motor has? anybody who can help me out i would be more than appreciative to. thank you for reading this. puppet.