A worker is pulling down the rope as shown.If the pulleys in the system are frictionless, andthe coefficient of static friction between thecrate and the floor is μs= 0.3, determine thesmallest force the worker must exert on therope in order to move the 100 kg crate, and theangle θ at this moment. 4) A worker is pulling down the rope as shown.If the pulleys in the system are frictionless, andthe coefficient of static friction between the3540°crate and the floor is µs = 0.3, determine thesmallest force the worker must exert on therope in order to move the 100 kg crate, and theangle 0 at this moment.

From Lami's theorem, (when three forces act at a point) T1sinα=T2sinβ=Wsinγ

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 357 40 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 0 at this moment.

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 357 40 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 0 at this moment.

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 7.55P: A wedge is used to prop up the 6000-lb block of marble. The wedge angle is =30, and the angle of...

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Question

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 μ_s= 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.

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
35
40°
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 0 at this moment.

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