A uniform board of length L and mass M lies near a boundary that separates two regions. In region 1, the coefficient of kinetic friction between the board and the surface is , and in region 2, the coefficient is 2. The positive direction is shown in the figure. (Figure 1) Figuro h ▼ Part A Find the net work W done by friction in pulling the board directly from region 1 to region 2. Assume that the board m constant velocity. Express the net work in terms of M, g, L, ₁, and 2- ► View Available Hint(s) W = Submit 15| ΑΣΦ ?

Find the work done in the figure below. The magnitude of F= 36 N. The displacement is d= -4.0 m/ and 0 = 120°. y d Enter to 2 significant figures W = 72 F -X X Making sense: Do you predict positive, negative or zero work? Does your answer support the prediction?

Current Attempt in Progress a In the figure, a horizontal force F of magnitude 18.0 N is applied to a 3.03 kg book as the book slides a distance d = 0.51 m up a frictionless ramp at angle 0 = 30°. (a) During the displacement, what is the net work done on the book by Fa, the gravitational force o the book, and the normal force on the book? (b) If the book has zero kinetic energy at the start of the displacement, what is its speed a the end of the displacement? Use g=9.81 m/s². ar (a) Number i (b) Number Units Units Psychology 8 +7

Write the expression for the work done by a constant force F applied at an angle q with respect to the displacement Dx of the object. Write the equation for the work done by a constant force over a displacement Dx in the same direction as the force. Identify every variable in each of the equations. please answer both questions

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A 3 kg block is pushed along a horizonal surface by a constant force of magnitude 46 N that is acting 30⁰ above the horizontal. The blocks moves a distance of 1.3 m and the coefficient of kinetic friction is 0.25. Determine the c.)the work done by gravity and d.) the work done y normal force.   Show solution and graph(FBD).

itemt 2 A block of mass m is released from rest at the top of an incline that makes an angle a with the horizontal. The coefficient of kinetic friction between the block and incline is 4k. The top of the incline is a vertical distance h above the bottom of the incline. Part A Derive an expression for the work W; done on the block by friction as it travels from the top of the incline to the bottom. Express your answer in terms of the variables u, m, g, h, and a. Iνα ΑΣφ ? W; = Submit Request Answer Part B When a is decreased, does the magnitude of W; increase or decrease? O When a decreases, the magnitude of W, stay the same. When a decreases, the magnitude of W, increases. O When a decreases, the magnitude of W decreases. Submit Request Answer Provide Feedback MacBook Air DII DD 80 ODO F11 FV F10 F9 F7 FB F6 F5 esc F3 F4 F2 F1 & #3 2$ 3 4 6. 7 8. 1 2

An object of mass m can only move on the +z axis. It is subjected to a force in the +z direction given by F(x) = the origin. a. How much work does this force do if the object moves from z = a b. If at a the block had an initial velocity of magnitude vo in the +z direction, what is its velocity at b if no other force is acting on the object? am where a is a constant and z is the distance from to z = b?

A rope that weighs 0.5 lb/ft is attached to a bucket filled with cement plaster that weighs 22 lbs. The bucket is initially at the ground. The work required to lift the bucket up to a point 10 ft from the ground is ot p S.O. f(y) dy a Compute a + b + f(6)

A person pushes a cart to the right with a force of 8 N at an angle of 0=40 degrees as shown in the diagram. The cart moves a horizontal distance by 10.0m, what is the work done by the force of gravity? (B) if the cart is moving at a constant velocity, determine the work done by the force of friction. C lastly, calculate the net work on the cart