Home  |  About  | Last |  Submit  |  Contact

 Tweet

 Question Ladder Equilibrium ( Physics Help and Math Help - Physics Forums Introductory Physics )Updated: 2008-11-10 11:40:38 (1)
 Ladder Equilibrium 1. The problem statement, all variables and given/known data A uniform 5.0-kg ladder is leaning against a frictionless vertical wall, with which it makes a 15* angle. The coefficient of friction between ladder and ground is 0.26. Can a 65-kg person climb to the top of the ladder without it slipping? If not, how high can the person climb? If so, how massive a person would make the ladder slip? 2. Relevant equations 3. The attempt at a solution So, I choose the end of ladder that is touching the floor to be the axis. Now I want to find the sum of the torques, then set them equal to zero. What I don't quite get in the equation is the sin(90-15) in the first term in the following equation my professor gave me: sin(90-15)? Technically, it should be the angle between the r and F....but this doesn't make sense to me....or perhaps 15* is meant to be the other angle in the triangle? If anyone can help, it would be greatly appreciated. Thank you!
 Answers: Ladder Equilibrium ( Physics Help and Math Help - Physics Forums Introductory Physics )