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- Show that, as explained in the text, a force F exerted on a flexible medium at its center and perpendicular to its length (such as on the tightrope wire in Figure 5.26) gives rise to a tension of magnitude T=F/2sin() .A block of mass m is pulled along a rough horizontal floor by an applied force P as shown. The normal force N is :A block of mass M is pulled by a force T at an angle theta about the horizontal and moves at constant speed over a rough surface (with friction) .The magnitude of the friction force is:
- A block of weight w is suspended from a rope tied to two other ropes at point O. One rope ishorizontally attached to a wall and the other is fastened to the ceiling. The angle betweenceiling and the rope is 60°. What are the tensions in each of the ropes? Assume the weights ofthe ropes and the knots are negligible. If the weight of the block is 100 N, what is the tension inthe ceiling rope?Suppose the tension in both of the cables is measured to be 50 N and that the angle thateach cable makes with the horizontal is known to be 30 degrees. What is the weight of thesign?A hiker who has broken his forearm rigs a temporary sling using a cordstretching from his shoulder to his hand. The cord holds the forearmlevel and makes an angle of 40.0° with the horizontal where it attachesto the hand. Considering the forearm and hand to be uniform, with atotal mass of 1.30 kg and a length of 0.300 m, find (a) the tension inthe cord and (b) the horizontal and vertical components of the force, f>,exerted by the humerus (the bone of the upper arm) on the radius andulna (the bones of the forearm).
- Calculate the static coefficient of friction, if the block's mass is 5 Kg and the angle is 20°In comparing two unequal forces on a rigid body, is it possible to have the larger force produce lesstorque than the smaller force?a. Yes b. NoEnter an expression for the magnitude of the force of the bottom-most parcel on the center parcel valid for any value of the vertical acceleration, ay, using only the parameters provided in the palette
- A 375-lb block rests on a rough plane inclined 35o with the horizontal. If thecoefficients of friction between the block and the plane are 0.58 for static and 0.3 for kinetic respectively, determine whether or not the block is at rest.If a box on a horizontal surface has an externally applied horizontal force less than the maximum static frictional force, the box has a motion relative to the surface equal to?A block of mass M is sitting on a surface inclined at angle θ. Given that the coefficient of static friction is μs between block and surface, what is the maximum angle θ so that the block doesn't slide?