**Text Transcription:**Q.1) A 120 lb. block is raised by a massless screw-activated wedge as shown below. The single-threaded screw has a mean radius of 0.5 inch and advances 0.2 inch for each complete turn. The coefficient of kinetic friction for the screw threads is 0.35, and the coefficient of kinetic friction for all contact surfaces of the block and the wedge is 0.4. Calculate the moment M which must be applied to the handle of the screw to raise the block at a constant speed.**Diagram Explanation:**The diagram illustrates a setup where a 120 lb block rests on a wedge inclined at 15 degrees. The wedge is connected to a screw mechanism. As the screw turns, it moves the wedge horizontally, which in turn raises the block vertically. The problem requires calculating the moment (torque) needed to apply to the screw handle to lift the block at a constant speed, taking into account the friction between the surfaces involved.

Here we will apply the general torque equation.

Q.1) A 120 lb. block is raised by a massless screw-activated wedge as shown below. The single-threaded screw has a mean radius of 0.5 inch and advances 0.2 inch for each complete turn. The coefficient of kinetic friction for the screw threads is 0.35, and the coefficient of kinetic friction for all contact surfaces of the block and the wedge is 0.4. Calculate the moment M which must be applied to the handle of the screw to raise the block at a constant speed.

Q.1) A 120 lb. block is raised by a massless screw-activated wedge as shown below. The single-threaded screw has a mean radius of 0.5 inch and advances 0.2 inch for each complete turn. The coefficient of kinetic friction for the screw threads is 0.35, and the coefficient of kinetic friction for all contact surfaces of the block and the wedge is 0.4. Calculate the moment M which must be applied to the handle of the screw to raise the block at a constant speed.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Axial Load

When a bar of the uniform cross-section is acted by a load, such that the load acts along the longitudinal axis of the bar, such kinds of loadings are known as axial loadings. In general terms, a load is an external force acting on a component. An axial load acts perpendicular to the geometric cross-section of the component. Based on the direction of the application of the load, an axial load can be tensile or compressive. The analysis of bodies under the action of axial loads is generally studied under the branch of mechanics, known as statics.

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**Text Transcription:**

Q.1) A 120 lb. block is raised by a massless screw-activated wedge as shown below. The single-threaded screw has a mean radius of 0.5 inch and advances 0.2 inch for each complete turn. The coefficient of kinetic friction for the screw threads is 0.35, and the coefficient of kinetic friction for all contact surfaces of the block and the wedge is 0.4. Calculate the moment M which must be applied to the handle of the screw to raise the block at a constant speed.

**Diagram Explanation:**

The diagram illustrates a setup where a 120 lb block rests on a wedge inclined at 15 degrees. The wedge is connected to a screw mechanism. As the screw turns, it moves the wedge horizontally, which in turn raises the block vertically. The problem requires calculating the moment (torque) needed to apply to the screw handle to lift the block at a constant speed, taking into account the friction between the surfaces involved.

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