Preview this course - (23 preview lessons)เริ่มเรียน เฉลยแบบฝึกหัด
4-4. Determine the distance s to which the 90-kg painter can climb without causing the 4-m ladder to slip at its lower end A. The top of the 15-kg ladder has a small roller, and at the ground the coefficient of static friction is 0.25. The mass center of the painter is directly above her feet.