Chapter 13, Problem 70P

The disk D, which has weight W = 15 lb, starts from rest on an incline when the constant moment M is applied to it. The disk is attached at its center to a wall by a spring of constant k = 7 ft/lb. The spring is unstretched when the disk is at its starting position. The disk rolls down the incline without slipping. Take R = 5 ft, 0 = 25° and g = 32.2 ft/s². Use for the moment of inertia of the disk about G, IG: Figure D Part B R M mR² wwww 1 of 1 Part A - Draw a free body diagram of the disk. Indicate which forces and/or couples do work on the disk. Determine the value of the moment M for the disk to stop after rolling down a distance d = 5 ft down the incline. You must use the work-energy theorem to solve this question.

The 1.9-kg slider is released from rest in position A and slides without friction along the vertical-plane guide. Determine the normal force exerted by the guide on the slider (a) just before it passes point C, (b) just after it passes point C, and (c) just before it passes point E. The normal forces are positive if they point up and/or to the left, negative if they point down and/or to the right.

The slotted arm OA rotates about a fixed axis through O. At the instant under consideration, θθ = 34°, θ˙θ˙ = 43 deg/s, and θ¨θ¨ = 10 deg/s2. Determine the magnited of the force F applied by arm OA and the magnitude of the force N applied by the sides of the slot to the 0.3-kg slider B. Neglect all friction, and let L = 0.88 m. The motion occurs in a vertical plane.

3. The 50-lb block rests on the rough surface for which the coefficient of kinetic friction is u, = 0.2. A force F acts on the block in the direction shown. If the spring is originally unstretched (s determine the power developed by the force the instant the block has moved s = 100 lb 0) and the block is at rest, 1.5 ft. F. 30° k = 20 lb/ft

The slotted arm OA rotates about a fixed axis through O. At the instant under consideration, 0 = 37,0 = 44 deg/s, and 0 = 23 deg/s². Determine the magnited of the force F applied by arm OA and the magnitude of the force N applied by the sides of the slot to the 0.5-kg slider B. Neglect all friction, and let L = 0.84 m. The motion occurs in a vertical plane. Answers: F= N= i i -L m N B N 79⁰

The 10-lb collar starts from rest at A and is lifted by applying a constant vertical force of F = 25 lb to the cord. Part A: If the rod is smooth, determine the power developed by the force at the instant θ = 60 degress

The 35-kg crate is subjected to a force inclined to 70° respect to vertical plane having a constant direction and a magnitude F = 150 N. When s = 20 m, the crate is moving to the right with a speed of 10 m/s. Calculate for normal reaction and its speed when s = 30 m. The coefficient of kinetic friction between the crate and the ground is mk = 0.35.

Please do it fast

The 50-kg package at Point A is rolling on a smooth ramp, where the ramp has two circular arcs AB and CD. Section BC is a straight path, and the radius of CD is r = 25 m. The heights of the ramp at g and b are given as a = 15 m and b = 30 m. At point 4, the package is initially at rest and then rolls freely along the ramp until it reaches point D and lands onto a cart. The air resistance and rolling resistance are ignored. a. Determine the datum line and draw Free Body Diagram (FBD) at point B, C, and D. b. Using the principle of conservation of energy, determine the normal component of acceleration at point B. c. Determine the normal force exerted by the ramp on the package at point B.