Chapter 15, Problem 72P

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.

Q13. As shown in the image below, the 54 kg-crate is initially at rest, and at a distance d= 6.0 m from the top of the spring. Then it slides down the inclined plane. If the coefficient of kinetic friction between the crate and the inclined plane is uk = 0.22, determine the compression of the spring, x, when the crate momentarily stops (as the spring reaches maximum compression). The spring has spring constant k = 1.3 kN/m and initially the spring is unstretched. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point, and proper SI unit. Take g = 9.81 m/s². d k 45° Your Answer: Answer units

The boy of mass 46 kg is sliding down the spiral slide at a constant speed such that his position, measured from the top of the chute, has components r = 1.5 m, 0 = (0.7t) rad, and z = (-0.5t) m, where t is in seconds. Neglect the size of the boy. Part A Determine the r, 0, z components of force F which the slide exerts on him at the instant t = 2 s using scalar notation. Fr, Express your answers in newtons to three significant figures separated by commas. Fe, F = 195| ΑΣΦΑ Z vec r = 1.5 m Submit Request Answer www. ?

The 1.1-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.

Q13. As shown in the image below, the 86 kg-crate is initially at rest, and at a distance d = 8.2 m from the top of the spring. Then it slides down the inclined plane. If the coefficient of kinetic friction between the crate and the inclined plane is μ = 0.23, determine the compression of the spring, x, when the crate momentarily stops (as the spring reaches maximum compression). The spring has spring constant k = 1.8 kN/m and initially the spring is unstretched. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point, and proper SI unit. Take g = 9.81 m/s². Your Answer: 45° Answer d units

The 110-lb boy at A is suspended from the cable that passes over the quarter circular cliff rock. What horizontal force must the woman at A exert on the cable in order to let the boy descend at constant velocity? The coefficients of static and kinetic friction between the cable and the rock are μs=0.4 and μk=0.35, respectively.

The 15-kg block A slides on the surface for which μk = 0.3.The block has a velocity v = 12 m/s when it is s = 3 m from the 11-kg block B. The unstretched spring has a stiffness k = 1200 N/m . Take e = 0.6. The coefficient of friction is the same for both blocks. a) Determine the maximum compression of the spring due to the collision. xmax = ?

The 860-kg motorized unit A is designed to raise and lower the 700-kg bucket B of concrete. Determine the average force R which supports unit A during the 6.2 seconds required to slow the descent of the bucket from 3.6 m/s to 1.0 m/s. Analyze the entire system as a unit without finding the tension in the cable. A B Answer: R = i kN

The 81-kg crate is subjected to the forces shown. If it is originally at rest, determine the distance it slides in order to attain a speed of v = 8 m/s. The coefficient of kinetic friction between the crate and the surface is uk = 0.27. Forces with respect to 45° and 30° are 611 N and 398 N, respectively