1. The problem statement, all variables and given/known data I have this question to solve for hw : " An object of mass 10 kg is whirled around a horizontal circle of radius 4m" If the uniform speed of the object is 5m/s Calculate a) tension in string b) angle of inclination of string to the vertical. 2. Relevant equations 3. The attempt at a solution Here is what I tried: I thought of finding the length of the entire string so using 2pi*r I got 25.12. then using the sine inverse of that to get the angle i got 4(radius)/25.12 =.16 sine inverse which would give an angle of 9.2 degrees. then I used tension = mg/cos(theta) = 10 * 9.81/.99 = 99.1 N. I also tried to work out the angle a different way using k=.5mv2 to find energy which gave me 125 Joules and then i plugged that into the potential energy formula to give me the height so potential energy = mgh thus h= energy/g*m which gave me 1.27m. then i used CAH trignometry to give me .9 cos inverse = 26degrees. This was the method I used to solve a momentum question but I doubt it works in this case. Now I realize I made a mistake which is why Im coming here. I thought I had found the length of the string when i used 2pi*r but iI realized I actually just found the perimeter of the circle the radius made. Any help would be appreciated.