The following data is refers to a screw jack. The vertical load on the screw320kN Force applied at the lever end whose length=80cm The mean radius of the screw=2.5cm Pitch of the screw=1cm Co-efficient of friction between the screw thread and the nut=0.15 Determine the force on the lever end while raising the load and efficiency of the screw jack

The following data is refers to a screw jack. The vertical load on the screw320kN Force applied at the lever end whose length=80cm The mean radius of the screw=2.5cm Pitch of the screw=1cm Co-efficient of friction between the screw thread and the nut=0.15 Determine the force on the lever end while raising the load and efficiency of the screw jack

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 7.57P: The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a...

See similar textbooks

Similar questions

The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a mean radius of 75 mm. The static and kinetic coefficients of friction between the gear and the screw are 0.12 and 0.06, respectively. The input torque applied to the screw is C0=10Nm. Assuming constant speed operation, determine the output torque C1 acting on the gear.
Calculate the horizontal force P required to push the 85-lb lawn mower at constant speed. The center of gravity of the mower is at G, and the coefficients of rolling resistance are 0.12 for the front wheels and 0.18 for the rear wheels.
The block of weight W is pulled by the force P inclined at the angle to the horizontal. Find the smallest force P and the corresponding angle that would cause impending sliding of the block. The angle of static friction between the block and the ground is s.
The following data is referring to a screw jack. The vertical load on the screw = 20kN Force applied at the lever end whose length = 80cm The mean radius of the screw = 2.5cm Pitch of the screw =1cm Co-efficient of friction between the screw thread and the nut = 0.15 Determine the force on the lever end while raising the load and efficiency of the screw jack
The figure shows a pair of pin-jointed gripper-tongs holding an object weighing 2000 N. The coefficient of friction (u) at the gripping surface is 0.1. XX is the line of action of the input force and YY is the line of application of gripping force. If the pin- joint is assumed to be frictionless, the magnitude of force Frequired to hold the weight is F Pin Y- 2000 N 150mm ww 00
2. A square threaded screw of mean diameter 25 mm and pitch of thread 6 mm is utilised to lift a weight of 10 kN by a horizontal force applied at the circumference of the screw. Find the magnitude of the [Ans. 966 N] force if the coefficient of friction between the nut and screw is 0.02. A bolt with a squore threaded screw has mean diameter of 25 mm and a nitch of 23 mm It carries an
Consider a 14.5 kg rectangular block of length 0.40 m attached to a spring with a spring constant of 30.5 N/m. The coefficient of static friction between this block and the surface is 0.310.
A ladder of length 2L and mass M is positioned on level ground leaning against a wall such that the angle between the ladder and the horizontal is @. The coefficient of static friction between the ladder and the wall and between the ladder and the ground is jistatic = 0.66. The centre of mass of the ladder is halfway along it. For the ladder to be in mechanical equilibrium: Consider torques about the centre of the ladder. In which direction (into or out of the page) does the torque due to each of the 5 forces force act?Write down an equation for the sum of the torques about the centre or mass of the ladder and then use your equation for the torques to derive an expression for tan o in terms of the magnitudes of the forces acting
In an experiment to find the coefficient of static friction, two plates (e) made of the sam material, m, = 200 gm, and m,= 400 gm. Each plate is put on the top of the same inclined plane, and we start to increase the inclination angle (z Jeo Legb). e Select one: a. The coefficient of static friction determined using m, is lower b. The coefficient of static friction determined using m, is lower will slide at lower angle than m, c. m1 d. Both will slide at the same angle
The crate has a weight of 490 lb and a center of gravity at G rests on the floor for which the coefficient of static friction is equal to 0.3. If the force P = 300 lb is applied as shown in the figure below. The static friction force developed between the crate and the ground is. P. -2 ft2 ft- 4 ft 3 ft Figure 1 Select one: O a. 201-lb Ob. 300-lb OC. 240-lb Od.610 lb FUJTSU
A wedge assembly, composed of wedges X and Y, is designed to lift crate W whose weight is 1CDE N, as shown in the figure below. What will be the maximum force P that can be applied before movement begins if the coefficient of friction for all surfaces of contact is 0.0875? Draw all necessary free-body diagrams and indicate the direction of impending motion. This is not your it in any way property so do not use were your own. 1CDE N W This is not your own property so do not use it in any way as if it were your own. 1C P property sol The not it in any way if your ow Parameters 1℃° 1D ° 1E ° 1CDE N 13° 14° 15° 1345 N 1Dº of use 1Eº
A 200 lb block is in contact with a plane inclined at 30 degrees to the horizontal. A force P, parallel to and acting up the plane, is applied to the body. If the coefficient of static friction is 0.20, find: a. the value of P to just cause the motion to impend up the plane b. the value of P just to prevent motion down the plane c. the magnitude and direction of the friction force F if P= 80 lbs