A person is pushing on a uniform block of wood as shown in the figure and parameter table. The block of wood has mass 140 kg and a coefficient of static friction of Hs, w = 0.3. Assume the person only exerts a horizonatal force on the block of wood, and their shoes have a coefficient of static friction Hs,p = 0.4. What is the minimum mass the person needs to be able to move the block? Also, what is the maximum value of 4a, w that the wood could have and still slide instead of tip if pushed at the same location?

A person is pushing on a uniform block of wood as shown in the figure and parameter table. The block of wood has mass 140 kg and a coefficient of static friction of Hs, w = 0.3. Assume the person only exerts a horizonatal force on the block of wood, and their shoes have a coefficient of static friction Hs,p = 0.4. What is the minimum mass the person needs to be able to move the block? Also, what is the maximum value of 4a, w that the wood could have and still slide instead of tip if pushed at the same location?

Mechanics of Materials (MindTap Course List)

9th Edition

ISBN:9781337093347

Author:Barry J. Goodno, James M. Gere

Publisher:Barry J. Goodno, James M. Gere

Chapter2: Axially Loaded Members

Section: Chapter Questions

Problem 2.8.12P: A bungee jumper having a mass of 55 kg leaps from a bridge, braking her fall with a long elastic...

See similar textbooks

Similar questions

A bungee jumper having a mass of 55 kg leaps from a bridge, braking her fall with a long elastic shock cord having axial rigidity EA = 2.3 kN (see figure). If the jumpoff point is 60 m above the water, and if it is desired to maintain a clearance of 10 m between the jumper and the water, what length L of cord should be used?
The ladder in the figure rests on a horizontal surface (point A) and a vertical wall (point B). The coefficient of static friction between the ladder and the horizontal surface is ??, while the friction of the ladder with the vertical wall is negligible. Assuming that the center of gravity of the ladder is at half its length, determine the minimum value of ??, to ensure that the ladder remains at rest.
two boxes each of weight 75lb are stacked as shown in the figure .If the coefficient of static friction between the boxes is ps =0.8 and between the box anf floor is us =0.5,Find the minimum force P to cause motion.
Q3/ A screw-jack is used to lft a load of 4 kN. The screw of the screw-jack is square threaded with two threads to 1 cm. If the co-efficient of friction between the nut and screw is 0,095 and outer diameter of screw s 6 cm, find the force required atthe end of the handle of length 50 cm to ift the load. (20 M)
A 125 kg wheel with a radius of 2.50 m is being pulled up an incline by a 550 kg horse. There is a 45.0 cm high protrusion in the incline, as shown in the figure. a)What is the tension in the rope when the wheel is just beginning to lift off the incline to go over the protrusion? b)What is the minimum possible coefficient of static friction between the horse and the incline for the horse to be able to pull the wheel over the protrusion?
3. A square threaded bolt of mean diameter 24 mm and pitch 5 mm is tightened by screwing a nut whose mean diameter of bearing surface is 50 mm. If the coefficient of friction for the nut and bolt is 0.1 and for the nut and bearing surfaces 0.16, find the force required at the end of a spanner 0.5 m long when the load on the bolt is 10 kN.
A vertical shaft rotated with n revolutions moves by pressing a slot with the force F as shown in the figure. Find the power spent on friction.u = 46, n = 690 (rev / min), R = 23mm, r = 46/5, μk = 0.46, F = 138N
Flat belt 100mm wide and 8mm thick transmits power between two pulleys, running at 1600 m/min. The mass of belt is 0.9kg/m length, the angle of lap in the smaller pulley is 165o and the coefficient of friction between the belt and pulleys is 0.3, If the maximum permissible stress in the belt is 2MN/m2, find the maximum power transmitted.
You pull on a large box using a rope as in Fig. 5.21a, except the rope is at an angle of 15.0° below the horizontal. The weight of the box is 325 N, and the coefficient of kinetic friction between the box and the floor is 0.250. (a) What must be the tension in the rope to make the box move at a constant velocity? (b) What is the normal force that the floor exerts on the box?
In the figure below there are two blocks, connected by a bar with frictionless pins. Block A weighs 2200 N. The coefficient of friction of all surface is 0.17. The connecting bar is homogeneous and weighs 150 N, what is the minimum weight of B in order to prevent slipping motion?
A 110-kg uniform ladder is tied at its bottom on the wall using a wire shown in the figure. The floor is frictionless, while the wall is rough. The maximum tension on the wire is 180 N. (a) What is the normal force exerted by the wall on the ladder? (b) What is the frictional force exerted by the wall to the ladder?
2 A ladder 5 m long and weighing 260 N is placed against a vertical wall at an inclination of 30 ^ 0 with wall. A wan weighing 780 N climbs the ladder. When he is at a distance of 1.64 m along the ladder from lower all contact surfaces? end, the ladder slips. What is the coefficient of friction assuming it to be same for