1. The problem statement, all variables and given/known data Hello, i got three different assignments i need help with right now, my teacher overestimated me and my physics skills, so i'm kind of lost on these three: (i'm european so i work with meters) 1: A planets radius is 10 000 km. the gravitationalacceleration is g0 = 15 m/s^2 on the planets poles. The gravitationalacceleration on the equator is ge = 0 m/s^2 How fast does the planet rotate? 2: A cyclist is riding his bike in a circle, his speed is v = 72 km/h and the radius of the circle is r = 25 m what's the angle alpha? http://sv.tinypic.com/view.php?pic=xgjqef&s=8#.Vhp9zytbfo0 3: a piece of garbage is hanging from a line. the mass of the garbage is m = 20 kg The line forms the angle alpha = 5 degress (watch my picture) the the tension of the line? http://sv.tinypic.com/view.php?pic=14l5ra&s=8#.Vhp_MStbfo0 3. The attempt at a solution 1: i'm clueless. 2: clueless 3: i'm thinking of dividing the counter force into two vectors, one vertical and one horizontal. and then somehow achieve an answer. I'm on thin ice please help godsspeed.