Question

SECTIONB (4+4+4+4-16) A ladder carried by a fire truck is 20.0m long. The ladder weighs 3400 N and its center of gravity is at its center. The ladder is pivoted at one end A about a pin ( fig). You can ignore the friction torque at the pin. The ladder is raised into position by a force applied by a hydraulic piston at C. Point C is 8.0m from A, and the force F exerted by the piston makes an angle of 40° with the ladder. What magnitude must F have to just lift the ladder off the support bracket at B? Start with a FBD diagram of the ladder. 1. 2. A circular steel wire 1.00m long must stretch no more than 0.25cm when a tensile force of 500 N is applied to each end of the wire. What minimum cross-sectional area is required for the wire? given: Yanel-2.0x 10' Pa.)