Exemple: 18-63. The uniform 80-lb garage door is guided at its ends on the track. If it is released from rest at 0 = 0, determine the door's angular velocity at the instant = 30°. The spring is originally stretched 1 ft when the door is held open, = 0°. Assume the door can be treated as a thin plate, and there is a spring and pulley system on each of the two sides of the door. Solution: 8 ft 8 ft k = 9 lb/ft

Exemple: 18-63. The uniform 80-lb garage door is guided at its ends on the track. If it is released from rest at 0 = 0, determine the door's angular velocity at the instant = 30°. The spring is originally stretched 1 ft when the door is held open, = 0°. Assume the door can be treated as a thin plate, and there is a spring and pulley system on each of the two sides of the door. Solution: 8 ft 8 ft k = 9 lb/ft

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

See similar textbooks

Similar questions

3. A yo-yo has a weight of 0.3 lb and a radius of gyration ko = 0.06 ft. If it is released from rest, determine how far it must descend in order to attain an angular velocity @ = 70 rad/s. neglect the mass of the string and assume that the string is wound around the central peg such that the mean radius at which it unravels is r = 0.02 ft.
F17-3. The 20-1b link AB is pinned to a moving frame at A and held in a vertical position by means of a string BC which can support a maximum tension of 10 lb. Determine the maximum acceleration of the frame without breaking the string. What are the corresponding components of reaction at the pin A? A 3 ft 4 ft 1B F3ft - Prob. F17-3
The 10-kg uniform cylinder is pin supported at its center O. The square isacted upon by a constant force F = 10N and a constant couple moment M = 10 Nm.If the disk starts from rest, determine1) The reactions at the pin O and the angular acceleration of the disk2) The number of revolutions it must take to attain an angular velocity of 10 rad/s
SOLVE USING PRINCIPLE OF WORK AND ENERGY
The shown spool has a mass of 450 kg and aradius of gyration Gk=1.2 m. It rests on thesurface of conveyer belt for which the coefficient offriction m= 0.5. If the conveyer acceleratesat2 1.2m / S and the spools rolls without slipping,determine the tension in the wire and the angularacceleration of the spool
At the instant shown, the spring is un-deformed. Determine the change in potential energy if the 20 kg disk (with radius of gyration kG = 0.5 m) rolls 2 revolutions without slipping. k= 200 N/m 3 m/s datum 0.3 m M = 2 Nm 30° O 1791 J O -1791 J O 1051 J O 1421 J O E) None of the above
The 3.8 kg block is descending at a rate of 1.2 m/s when the hydraulic cylinder BC exerts a force F=500 N on the brake arm. Determine the number of radians the wheel will rotate before the system comes to rest. The wheel has a mass of 25 kg and a radius of gyration about its center kO=300 mm. The coefficient of kinetic friction between the brake arm and the wheel is 0.25.
The system is made up of the 1-m, 6.7-kg uniform rod AB and the two uniform disks (each of 0.10 m radius and 2.2 kg mass). If the system is released from rest when 0- 55", when rod AB has just become horizontal, determine the angular velocity of rod ABin rad/s. Assume the disks roll without slipping. Your answer must include 2 places after the decimal point. Please pay attention: the numbers may change since they are randomized. Take g= 9.81 m/s?. 1m
The uniform 80 kg slender rod is at rest in the position shown when P = 450 N is applied. Determine the value of angular velocity, w2 the rod if L1 = 5.5 m and L2 = 6.5 m. A L L2 L1 B
The 21-kg uniform thin hollow square plate is pinned at point O, and its side L = 0.5 m. If it is subjected to the constant moment M = 78 N•m and is released from rest from the position as shown, determine its angular velocity w (in rad/s) when it has rotated 45°. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point. Take g = 9.81 m/s2. `L MV Your Answer: Answer
0₁ Oy || 5 Kronk is asked to pull the lever. He applies a force of 20 N, causing the 8 kg lever to have an angular rad velocity of 3 || 6 8 . Determine the angular acceleration of the lever and the reaction forces at O. Assume the lever is a slender rod and that the lever was originally propped up to be level horizontally. The prop was removed at the instant Kronk applied the force. α = 5 Kronk applies the force at a length 7 and the lever has length 1 = 0.2 m. Use negative if CW 1 N N 1 rad 8² F (0) -CCW
the disc rolls without slipping and at a given instant, its velocity and angular acceleration is as shown. Pin A is fixed to the disc. determine the reaction at pin A The exercise is shown in the attached image