1. The problem statement, all variables and given/known data As a result of friction, the angular speed of a wheel changes with time according to d θ/d t = ω_0 e^(−σ t) , where ω0 and σ are constants. initial angular speed = 5.45 rad/s σ =.23913 Determine the number of revolutions the wheel makes after 2.33 s . Answer in units of rev. 3. The attempt at a solution I know I have to take the integral which is: θ = - w_0/(σ *e^(-σ *t)) My numbers are initial velocity= 5.45 rad/sec, sigma= .023913, and time=2.33 seconds. so when I solved I got -13.0589 radians and divided it by 2pi to get revolutions, which gave me -2.07839. I thought the answer would be 2.07839 because revolutions can't be negative but it is not right, should i use the negative or am i doing something wrong?