Raising a Ladder a ladder carried by a fire truck is 20.0 m long. The ladder weighs 2800 N and its center of gravity is at its center. The ladder is pivoted at one end (A) about a pin (Hg.
(Hg. 11.22); 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 8.0 m 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 B1 Start with a free-body diagram of the ladder?
8.0 m -120 ш- Уao 40° в
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IDENTIFY Apply 7 0 to the ladder SET UP Take the axis to be at point 4 The free bod…View the full answer
Take 2 forks and place them on one another in such a way that we can place the coin in between the prongs. Now try to place the coin with forks on the edge of the glass. It will take you some time to adjust the coin on the edge. This requires a little practice to adjust the coin on the edge of the glass. With a little effort, we will see the coin sitting on the edge calmly. If you look closely you will see it wobbling a little bit. The mass is in the handles of the forks so as a low center of mass it stables as it looks.
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