4-79. The man has a mass of 40 kg. He plans to scale the vertical crevice using the method shown. If the coefficient of static friction between his shoes and the rock is u) = 0.4 and between his backside and the rock, = 0.3, determine the smallest horizontal force his body must exert on the rock in order to do this. 4-79. The man has a mass of 40 kg. He plans to scalethe vertical crevice using the method shown. If thecoefficient of static friction between his shoes and therock is= 0.4 and between his backside and the rock,= 0.3, determine the smallest horizontal force hisbody must exert on the rock in order to do this.0.2 m-1.25 mProb. 4-79561N

Mass of mass=40kg To find horizontal force exerted by man on the rock

The man has a mass of 40 kg. He plans to scale the vertical crevice using the method shown. If the coefficient of static friction between his shoes and the rock is u) = 0.4 and between his backside and the rock, = 0.3, determine the smallest horizontal force his body must exert on the rock in order to do this.

The man has a mass of 40 kg. He plans to scale the vertical crevice using the method shown. If the coefficient of static friction between his shoes and the rock is u) = 0.4 and between his backside and the rock, = 0.3, determine the smallest horizontal force his body must exert on the rock in order to do this.

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 7.20P: The 3600-lb car with rear wheel drive is attempting to push the 4500-lb crate. The center of gravity...

See similar textbooks

Similar questions

A truck is traveling at 40 mph when the brakes are applied on all of its wheels, causing it to skid at about 33 feet before stopping. If the vehicle has a weight of 18 kips. Determine the constant horizontal force developed on the coupling at m, and the frictional force developed between the tires of the vehicle and the road during this time. The total mass of the trailer is 7 kips. Draw the fbd thank you
The 5000-N concrete block is adjusted its positionusing a 5° wedge under the action of force F. If thecoefficient of static friction between all contacts is0.3, determine the least force F required to movethe block. Answer: F = _____________
The three bars have a weight of WA = 20 lb, WB =40 lb, and WC = 60 lb, respectively. If the coefficientsof static friction at the surfaces of contact are asshown, determine the smallest horizontal force Pneeded to move block A.
3. Determine whether the 10 kg block shown is in equilibrium, and find the magnitude and direction of the friction force when P = 40 N and 0 = 20⁰. μ = 0.30 M = 0.25 20°
The mine car and its contents have a total mass of 7.1 Mg and a center of gravity at G . If the coefficient of static friction between the wheels and the tracks is μs = 0.34 when the wheels are locked, find the following: 1 The normal force acting on the front wheels at B is Blank 1 kN when the brakes at both A and B are locked. 2 The normal force acting on the rear wheels at A is Blank 2 kN when the brakes at both A and B are locked. 3 The friction force acting on the front wheels at B is Blank 3 kN when the brakes at both A and B are locked. 4 The friction force acting on the rear wheels at A is Blank 4 kN when the brakes at both A and B are locked. 5 With the given information above, does the car move? Answer with Yes or No only. Blank 5
Determine the smallest force the man must exerton the rope in order to move the 80-kg crate Also,what is the angle θ at this moment? Thecoefficient of static friction between the crate andthe floor is μs = 0.3.
The 3600-lb car with rear wheel drive is attempting to push the 4500-lb crate. The center of gravity of the car is at G, and the coefficients of static friction are 0.6 at B and 0.2 at C. Determine if the crate will slide. (The car pulling the crate is analyzed in Prob. 7.19.)
The 5000-N concrete block is adjusted its positionusing a 5° wedge under the action of force F. If thecoefficient of static friction between all contacts is0.3, determine the least force F required to movethe block.F =
Find the minimum force P required for impending motion of the block up the inclined surface, given: Mblock = 65 kg, θ = 52 °, μ = 0.4
A worker is pulling down the rope as shown. If the pulleys in the system are frictionless, and the coefficient of static friction between the crate and the floor is μs= 0.3, determine the smallest force the worker must exert on the rope in order to move the 100 kg crate, and the angle θ at this moment.
The mine car and its contents have a total mass of 7.1 Mg and a center of gravity at G . If the coefficient of static friction between the wheels and the tracks is μs = 0.34 when the wheels are locked, find the following: 1 The normal force acting on the front wheels at B is _______ when the brakes at both A and B are locked. 2 The normal force acting on the rear wheels at A is ________when the brakes at both A and B are locked. 3 The friction force acting on the front wheels at B is ________ when the brakes at both A and B are locked. 4 The friction force acting on the rear wheels at A is _________ when the brakes at both A and B are locked. 5 With the given information above, does the car move? Answer with Yes or No only. Blank 5
The wheel is subjected to a torque of M = 50 N If the coefficient of 0 kinetic friction between the band and brake and the rim of the wheel is 4k=0.3, determine the smallest horizontal force P that must be applied to the lever to stop the wheel.