7-36 Find the smallest angle 0 for which a sufficiently large force P would cause the uniform log AB of weight W to tip about A. P -Hj=0.2 A 20°
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- A 30 ft ladder, weighing 100 lbs having its center of mass one-third of the way up from the bottom, rests against a smooth wall so that it makes an angle of 60° with the ground. If the coefficient of friction between the ground and the ladder is 0.4, how high can a 150-lb man go before the ladder slips?A ladder leans against a frictionless vertical wall. If the ladder is uniform, has a mass of 5kg, and 2.5m long, then what is the friction on the bottom of the ladder when it sits at an angle of 75◦ with a 85kg person standing 1m from the top?A uniform plank of length 2.00m and mass 30.0kg is supported by three ropes, as indicated by the blue vectors in figure p8.27. Find the tension in each rope when a 700-N person is d=0.500m from the left end.
- If points A and B are located on the same rigid body, (Vb/a)=0 true or false?A ladder of uniform density and mass m rests against a frictionless vertical wall, making an angle of 60.0° with the horizontal...A uniform ladder 18 ft long and weighing 120 lbs rests against a smooth wall. The angle between the ladder and the ground is 70°. The coefficient of friction between the ground and the ladder is 0.25. How far up the ladder can a 180 lb man walk before the ladder slips?
- A uniform 1.0-N meter stick is suspended horizontally at the middle. A 2.0-N weight is suspended from the 10-cm position on the stick. Where should you place a 500 grams of mass in order to keep the meter-stick horizontal?A wooden door 2.1 m high and 0.90 m wide is hung by two hinges 1.8 m apart. The lower hinge is 15 cm above the bottom of the door. The center of mass of the door is at its geometric center, and the weight of the door is 260 N, which is supported equally by both hinges. Find the horizontal force exerted by each hinge on the door.A person is sitting with one leg outstretched and stationary, so that it makes an angle of 30 degrees with the horizontal, as the drawing indicates. The weight og the leg below the knee is 44.5N, with the center of gravity located below the knee joint. The leg is being held in this position because of the force M applied by the quadriceps muscles, which is attached 0.100m below the knee joint (see the drawing). Obtain the magnitude of M.
- A uniform stick AB can be balanced on a knife edge 10 cm from one end when a weight of 200N is hung from that end. When the knife edge is removed 5cm further from that end, the 200 N weight has to be moved to a point 8.75 cm from the knife edge to obtain a balance. Find the length of the stick and it's weight.A uniform ladder 6m long weighs 225N. It leans against a smooth vertical wall, making an angel of 53° with the horizontal ground. If the coefficient of friction between the foot of the ladder and the ground is 0.34, how far up the ladder can a 650N woman climb before the ladder starts to slip?A sculpture is 4.00 m tall and has its center of gravity located 1.80 m above the center of its base. The base is a square with a side of 1.10 m. To what angle, theta, can the sculpture be tipped before it falls over?