Question 5 Given, at the instant 0 = 60°, the boy's center of mass G is momentarily at rest. The boy has a mass of 60 kg. Neglect his size and the mass of the seat and cords. Find: The boy's speed and the tension in each of the two supporting cords of the swing when e = 90°. V:5.13 ms' roviD 10 ft T- 373.25 N en bavom et A nerow Avbnia

Question 5 Given, at the instant 0 = 60°, the boy's center of mass G is momentarily at rest. The boy has a mass of 60 kg. Neglect his size and the mass of the seat and cords. Find: The boy's speed and the tension in each of the two supporting cords of the swing when e = 90°. V:5.13 ms' roviD 10 ft T- 373.25 N en bavom et A nerow Avbnia

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.48P: Find the smallest distance d for which the hook will remain at rest when acted on by the force P....

See similar textbooks

Similar questions

In a Porter governor, the mass of the central load is 18 kg and the mass of each ball is 2 kg. The toparms are 250 mm while the bottom arms are each 300 mm long. The friction of the sleeve is 14 N. Ifthe top arms make 45° with the axis of rotation in the equilibrium position, find the range of speed ofthe governor in that position.
The Block with a mass of 4-Kg is hung with a spring. The stiffness constant of the spring K = 10 N/cm. The block is at rest position at point A with a 4-cm stretched of spring. Block is pulled down immediately with a force F=100-N Calculate the velocity of block when it passes point B which is 5-cm away from point A. K. 10 N/cm. 4 kg. VA- O A 5.cm. F = 100-N ---- --- VB = ?
3. A box of mass m=15 kg at the packaging section of a factory comes to the top of a (0=37°) with speed vo and slides down where it is picked up for shipment. In order to avoid damage to the box a spring is used with force constant k=100N/m and the ramp maximum force Fmax=100N. The box slides a distance of -4 m down the incline before it hits the spring is 0.75. ramp as shown. The coefficient of kinetic friction between the box and entire a) Find the work done by the normal force and Vo gravity friction force on the box until it hits the spring. b) Find the maximum speed of the box at the top of the ramp if the box is to be picked up in the spring is www when maximum compression.
Q5: The man in fig2 pushes on the 70 kg crate with a force of F=150N.Determine the power supplied the man when t-4s.the coefficient of kinetic friction between the floor and the crate Initially the create is at rest and ux = 0.4 F = 150 N Figure 2.
Fial I The figure shows a body consist of two segments which are a rod AB and a disk with weights of 4-lb and 11-lb respectively. The body is attched with a spring. The roller 1 ft k = 8 lb/ft Datum at C allows the spring to remain vertical as the rod falls. B A The length of the unstretched spring is 0.85 ft. If the body is released from rest and rotates CW about point B, 1 ft 3 ft determine the following: (Assume the datum at point B) 0.25 ft 1. The potential energy of the spring when the body is horizontal. 2. The potential energy due to gravity when the body is horizontal. 3. The potential energy of the spring when the body is vertical. 4. The potential energy due to gravity when the body is vertical. 5. The angular velocity at the instant the body becomes vertical.
3. A box of mass m=15 kg at the packaging section of a factory comes to the top of a ramp (0=37°) with speed vo and slides down where it is picked up for shipment. In order to avoid damage to the box a spring is used with force constant k=100N/m and the maximum force Fmax=100N. The box slides a distance of l=4 m down the incline before it hits the spring is 0.75. as shown. The coefficient of kinetic friction between the box and entire ramp a) Find the work done by the gravity , normal force and friction force on the box until it hits the spring. b) Find the maximum speed of the box at the top of the ramp if the box is to be picked up spring is maximum compression. when the in www
The lower block of mass m2 = 3.2 kg is pulled on by a rope with a tension force of 28 N. The upper block has mass m1 = 1.8 kg. The coefficient of kinetic friction between the lower block and the surface is 0.32. The coefficient of kinetic friction between the lower block and the upper block is also 0.32. What is the acceleration of the 3.2 kg block?
When Crates A and B of mass ma = 38 kg and mB = 74 kg are released from rest, Crate A moves to the right = 0.2 ). The force P = 18 Newtons is always acting on Crate B. The linear spring on a rough surface (u: has a stiffness of k = 480 N and is initially stretched 0.5 meters before the system is released from rest. m Neglect the mass of the pulleys and cables and neglect friction in the pulley bearings. Determine the work done by the external force P (in Joules) when Crate A has moved a distance of 0.5 meters to the right. wwwwm
vino encuen 20 Q4.:Block A in Fig 2 weighs 50 N and block B weighs 35 N. The blocks are connected by a flexible inextensible cord which passes over a smooth pully at C. The coefficient of friction between the plane and the block A is 0.3. The blocks are initially at rest. Determine the tension in the cord and the velocity of A after it has travelled 5 m. (20 marks) loq silt B C Fig. 2 A 3 25 N 4
When Crates A and B of mass ma = 40 kg and mB = 72 kg are released from rest, Crate A moves to the right on a rough surface (uk has a stiffness ofk = 430 N and is initially stretched 0.4 meters before the system is released from rest. = 0.4). The force P = 17 Newtons is always acting on Crate B. The linear spring т Neglect the mass of the pulleys and cables and neglect friction in the pulley bearings. Determine the magnitude of the velocity of Crate A (in ") when Crate A has moved a distance of 0.6 meters to the right. Consider g = 10 m 82 * k www P
The slotted arm OA rotates about a horizontal axis through point O. The 0.21-kg slider P moves with negligible friction in the slot and is controlled by the inextensible cable BP. For the instant under consideration, 0 = 32°, w = 0 = 4.5 rad/s, 0 = 0, and r = 0.62 m. Determine the corresponding values of the tension T in cable BP and the force reaction R perpendicular to the slot. The force R is positive if the contact comes from the lower edge of the slot and negative if the contact comes from the top edge. T= r = 0.62 m Answers: R= 0.33 m- 4.38 1.09 B A Z Z N N
The slotted arm OA rotates about a horizontal axis through point O. The 0.21-kg slider P moves with negligible friction in the slot and is controlled by the inextensible cable BP. For the instant under consideration, 0 = 24,0 = 0 = 5.3 rad/s, 0 = 0, and r = 0.51 m. Determine the corresponding values of the tension T in cable BP and the force reaction R perpendicular to the slot. The force R is positive if the contact comes from the lower edge of the slot and negative if the contact comes from the top edge. r=0.51 m 0.31 m- B