1.A 1-m diameter cylindrical mass, M, is connected to a 2-m widerectangular gate. The gate is to open when the water level,h, drops below 2.5 m. Determine the required value forM. Negate friction at the gate hinge and the pulley.
2.If the man at B exerts a force of P = 30 lb on his rope, determine the magnitude of the force F the man at C must exert to prevent the pole from rotating, i.e., so the resultant moment about A of both forces is zero. Please work this out step by step so I can look at the steps and learn how to do this problem and ones similar to them.
3.A 4-ft tall, 8-in wide concrete (150lb/ft3) retainingwall is built. During a heavy rain, water fills the spacebetween the wall and the earth behind it to a depth, h. Determine the maximum depth of water possible without the walltipping over. The wall simply rests on the ground without being anchored to it.