18-55. The slender 15-kg bar is initially at rest andstanding in the vertical position when the bottom end A isdisplaced slightly to the right. If the track in which it movesis smooth, determine the speed at which end A strikes thecorner D. The bar is constrained to move in the verticalplane. Neglect the mass of the cord BC.5m4 m4 m

The instantaneous center would be at point C and the final position when the end A strikes D will be…

Answered: 18-55. The slender 15-kg bar is…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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17-35. The sports car has a mass of 1.5 Mg and a center of mass at G. Determine the shortest time it takes for it to reach a speed of 80 km/h, starting from rest, if the engine only drives the rear wheels, whereas the front wheels are free rolling. The coefficient of static friction between the wheels and the road is u, wheels for the calculation. If driving power could be supplied to all four wheels, what would be the shortest time for the car to reach a speed of 80 km/h? 0.2. Neglect the mass of the G 0.35 m A -1.25 m- В -0.75 m
18-66. The end A of the garage door AB travels along the horizontal track, and the end of member BC is attached to a spring at C. If the spring is originally unstretched, determine the stiffness k so that when the door falls downward from rest in the position shown, it will have zero angular velocity the moment it closes, i.e., when it and BC become vertical. Neglect the mass of member BC and assume the door is a thin plate having a weight of 200 Ib and a width and height of 12 ft. There is a similar connection and spring on the other side of the door. 12 ft B 5 ft 15 5t 7 ft 2 ft 6 ft 'D
17-35. The sports car has a mass of 1.5 Mg and a center of mass at G. Determine the shortest time it takes for it to reach a speed of 80 km/h, starting from rest, if the engine only drives the rear wheels, whereas the front wheels are free rolling. The coefficient of static friction between the wheels and the road is us wheels for the calculation. If driving power could be supplied to all four wheels, what would be the shortest time for the car to reach a speed of 80 km/h? 0.2. Neglect the mass of the 0.35 m A -1.25 m-- 0.75 m
17-35. The sports car has a mass of 1.5 Mg and a center of mass at G. Determine the shortest time it takes for it to reach a speed of 80 km/h, starting from rest, if the engine only drives the rear wheels, whereas the front wheels are free rolling. The coefficient of static friction between the wheels and the road is µs wheels for the calculation. If driving power could be supplied to all four wheels, what would be the shortest time for the car to reach a speed of 80 km/h? 0.2. Neglect the mass of the G 0.35 m В -1.25 m- -0.75 m
*17-44. The uniform bar of mass m is pin connected to the collar, which slides along the smooth horizontal rod. If the collar is given a constant acceleration of a, determine the bar's inclination angle 0. Neglect the collar's mass.
*17-36. The desk has a weight of 75 lb and a center of gravity at G. Determine the initial acceleration of a desk when the man applies enough force Fto overcome the static friction at A and B. Also, find the vertical reactions on each of the two legs at A and at B. The coefficients of static and kinetic friction at A and B are u, = 0.5 and ug = 0.2, respectively. 30° 1 ft 2 ft 2 ft- 2 ft-
17-31. A car having a weight of 4000 lb begins to skid and turn with the brakes applied to all four wheels. If the coefficient of kinetic friction between the wheels and the road is µz = 0.8, determine the maximum critical height h of the center of gravity G such that the car does not overturn. Tipping will begin to occur after the car rotates 90° from its original direction of motion and, as shown in the figure, undergoes translation while skidding. Hint: Draw a free-body diagram of the car viewed from the front. When tipping occurs, the normal reactions of the wheels on the right side (or passenger side) are zero. 2.5 ft 2.5 ft
17-35. The sports car has a mass of 1.5 Mg and a center of mass at G. Determine the shortest time it takes for it to reach a speed of 80 km/h, starting from rest, if the engine only drives the rear wheels, whereas the front wheels are free rolling. The coefficient of static friction between the wheels and the road is u, = 0.2. Neglect the mass of the wheels for the calculation. If driving power could be supplied to all four wheels, what would be the shortest time for the car to reach a speed of 80 km/h? G 0.35 m A -1.25 m-- -0.75 m
17-43. Determine the acceleration of the 150-lb cabinet and the normal reaction under the legs A and B if P = 35 lb. The coefficients of static and kinetic friction between the cabinet and the plane are Hy = 0.2 and pz = 0.15, respectively. The cabinet's center of gravity is located at G. 4 ft 3.5 ft B.
17-106. The uniform bar of mass m and length L is balanced in the vertical position when the horizontal force P is applied to the roller at A. Determine the bar's initial angular acceleration and the acceleration of its top point B. 17-107. Solve Prob. 17–106 if the roller is removed and the coefficient of kinetic friction at the ground is µg. в L.
17-70. The 100-lb uniform rod is at rest in a vertical position when the cord attached to it at B is subjected to a force of P = 50 lb. Determine the rod's initial angular acceleration and the magnitude of the reactive force that pin A exerts on the rod. Neglect the size of the smooth peg at C. 4 ft A 3 ft P = 50 lb B 3 ft
The torsional spring has a stiffness of 24 N-m/rad and is undeflected when the 6.6-kg uniform slender bar is in the upright position. If the bar is released from rest in the horizontal position shown, determine its angular velocity w as it passes the vertical position. Friction is negligible. K 0.68 m Answer: W = i rad/s

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