3m 5m A B 4m Figure 2 4. A thin horizontal beam of negligible mass is hinged at one end A and supported at the other end B by a string, shown in Figure 2. The string can withstand a maximum tension of 30 N. A possum of mass m = 3 kg walks out along the beam. How far along the beam can the possum go before the string breaks?

A crane of mass m1 = 3 000 kg supports a load of mass m2 = 10 000 kg as shown in Figure P10.36. The crane is pivoted with a frictionless pin at A and rests against a smooth support at B. Find the reaction forces at (a) point A and (b) point B. Figure P10.36

F, y mg AF f.y F, fx e Axis The ladder in the picture has a mass of 39 kilograms and a length 3 meters. What is the normal force pushing the ladder up from the floor? This force is labeled Ff y in the picture. FN N. %D Assume that the ladder's weight is evenly distributed, so it can be treated as a single force through the middle. If the ladder is at a 69° angle from the ground, what is the torque exerted by the weight (using the floor as the pivot point)? N.m The torque from the ladder must be balanced by the torque caused by the normal force on the wall, labeled Fw in the picture. Calculate this force. Fw - N. The normal force from the wall must be balanced by the friction force from the floor, labeled Ff x.in the picture. Determine the minimum coefficient of friction to keep the

Figure P8.27. Find the tension in each rope when a 700.-N worker stands 1.00 m from one end? e2cm lon ropes, as indicated by the blue vectors in 27. VA uniform plank of length 2.00 m and mass 30.0 ke by three ropes, as indicated by the blue vectors in supported Figure P8.27. Find the tension in each rope when a 700 N person is d = 0.500 m from the left end. er of gravig fo 12, modeling rethooran 8 B of model 10.26 T, T2 0.250 Theatthe le 40.0° lid or boln vibbud ns bano sdi svode m81 o + d » 3. 2.00 m di In bas rirob be ss gairda Figure P8.27 goil sdrto idgiod oh bail rel 2 00 bou d 28. A hungry bear weighing 700. N walks out on a heam in