Part A You want to nail a 1.9 kg board to the wall of a barn, as shown below. To position the board before nailing, vou push it against the wall with a horizontal force F to keep it from sliding to the ground. The coefficient of static friction betwee the board and the wall is 0.64. The least force you can apply and still hold the board in place is (enter your answer with two significant figures) Fnet =ma tmax = HN W = mg 29 N Submit Previous Answers v Correct
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- A crate of mass 100.0 kg rests on a rough surface inclined at an angle of 37.0with the horizontal. A massless rope to which a force can be applied parallel to the surface is attached to the crate and leads to the top of the incline. In its present state, the crate is just ready to slip and start to move down the plane. The coefficient of friction is 80of that for the static case. (a) What is the coefficient of static friction? (b) What is the maximum force that can be applied upward along the plane on the rope and not move the block? (c) With a slightly greater applied force, the block will slide up the plane. Once it begins to move, what is its acceleration and what reduced force is necessary to keep it moving upward at constant speed? (d) If the block is given a slight nudge to get it started down the plane, what will be its acceleration in that direction? (e) Once the block begins to slide downward, what upward force on the rope is required to keep the block from accelerating downward?A body with a mass M placed on a tilted surface at an angle of 0 (see figure) We applied a horizontal force F = Mg on the body as shown. a) Assume that the frictional force between the body and the surface is large so that the body remains in place. Find the FN Vertical Force and the Friction Force? b) In terms of the static coefficient of static friction oh what is the range of angle 0 at which the object remains static?A loaded penguin sled weighing 75.0 N rests on a plane inclined at angle θ = 17.0° to the horizontal (see the figure). Between the sled and the plane, the coefficient of static friction is 0.290, and the coefficient of kinetic friction is 0.160. (a) What is the minimum magnitude of the force F→, parallel to the plane, that will prevent the sled from slipping down the plane? (b) What is the minimum magnitude F that will start the sled moving up the plane? (c) What value of F is required to move the sled up the plane at constant velocity?
- Consider Figure P2-10 on P. 37 of your textbook showing two forces applied to a truss. Assume the 400 N acts along the + x-axis. a) Find the magnitude of the resultant force acting at point B. b) What is the angle © between the resultant force and the + x-axis?Piles of snow on slippery roofs can become dangerous projectiles as they melt. Consider a chunk of snow at the ridge of a roof with a slope of 32 degrees. a.) What is the minimum value of the coefficient of static friction that will keep the snow from sliding down? Express your answer using two significant figures. b.) As the snow begins to melt, the coefficient of static friction decreases and the snow finally slips. Assuming that the distance from the chunk to the edge of the roof is 5.0 m and the coefficient of kinetic friction is 0.10, calculate the speed of the snow chunk when it slides off the roof. Express your answer to two significant figures and include the appropriate units. c.) f the roof edge is 12.5 m above ground, estimate the speed of the snow when it hits the ground. Express your answer to two significant figures and include the appropriate units.A massive block was pulled at an angle of 30o in a horizontal rough surface by a force of magnitude F enough for the block to move. If we set the +x-axis at the right, which of the following statements is true about the forces acting on the block? Explain answer. A. The direction of the frictional force experienced by the block is to the leftB. The normal force’s direction is 30 degrees above the +x-axisC. The block will not experience friction since F is just enough to move the block D. The direction of the weight of the block is about 210 degrees from the x-axis.
- A loaded penguin sled weighing 61.0 N rests on a plane inclined at angle θ = 23.0° to the horizontal (see the figure). Between the sled and the plane, the coefficient of static friction is 0.260, and the coefficient of kinetic friction is 0.120. (a) What is the minimum magnitude of the force ?→�→, parallel to the plane, that will prevent the sled from slipping down the plane? (b) What is the minimum magnitude F that will start the sled moving up the plane? (c) What value of F is required to move the sled up the plane at constant velocitya 15kg box rest on a horizontal surface. (a) What is the minimum horizontal force that is required to cause the box to begin to slid if the coefficient of static friction is 0.35? (b) What is the acceleration of the system if a person pushes the box with a force of 90N if the coefficient of kinetic friction is equal to 0.20?Unlike most of the other muscles in our bodies, the masseter muscle in the jaw, as illustrated in the figure, is attached relatively far from the joint, enabling very large forces to be exerted by the back teeth. This is shown in the figure below, where a person is biting down on a bullet placed between the back teeth. (FM= 210 N and rR = 4.1 cm.) (a) Using the information in the figure, calculate the magnitude of the force exerted by the teeth on the bullet. (b) Calculate magnitude of the force on the joint.
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