Answered: Thank you . But where did you get 12…

Engineering

Mechanical Engineering

Thank you . But where did you get 12 from ?

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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2) Orthogonal Cutting: Consider a person who is shoveling snow from the sidewalk. This person can choose between two different shovel designs. Shovel A rides at a 5°angle off the normal to the sidewalk, while shovel B is oriented at a 30° angle (from the normal to the sidewalk). Either way, two inches of snow will be removed. Which shovel will require less pushing force? Please write your answer as the ratio of the force for shovel A to the force for shovel B. Assume the friction between the snow and the shovel is 1.0. Both shovels are the same width (into the page). The thickness of the removed snow riding up the face of the shovel is as shown in the figures. In both cases, the snow has the same physical properties (strength, stiffness, etc.). 2 in snow 3 in ground Shovel A 5 degrees shovel Pushing force 2 in snow ground 30 degrees /2.75 in shovel Shovel B Pushing force
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1. If a machinist wanted to drill a % inch hole in a piece of machine steel using a high speed steel drill. At what speed in revolutions per minute should he operate the drill press? 2. Find the revolutions per minute of an 8 mm drill if it is used to cut an aluminum workpiece using a high carbon steel drill. 3. The rpm setting of the drill press is set to 600 rpm. What is the maximum diameter in inches of a high speed drill if it is used to drill a tool steel material? 4. A drill press has the following rpm settings; 350, 600, 1100, & 1600. What rpm setting must be used if a 15 mm high speed steel drill is used to cut brass workpiece? 5. A machine operator drills a hole of a 3/8 inch diameter to a stainless steel using a carbon steel drill. He sets the drill press rpm setting to 900 rpm. Is he operating at correct setting? If not, then what must be the correct rpm setting considering that the machine has the following rpm settings of 300, 600, 900, 1200, and 1800?
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many hours did the carpenter work on the job? 6. What is the area of a rectangular floor that is 7'-3" long and 4'-2" wide? 7. There are 15 risers in a set of stairs running from the basement to the first floor. Each riser is 7 1/4" high. What is the distance between floors? 8. The distance between two floors is 9'-0 1/2". If 14 risers are to be used in a set of stairs, what is the height of each riser?
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Write TRUE is the statement/s is True. If the statement is false, identify the word/s that makes the sentence incorrect and write its corresponding correct answer. 1. High cutting temperature is undesirable because it reduces tool life, produces hot chips and can cause inaccuracies in tool dimension due to thermal expansion. 2. Cubic boron nitride does chemically react with iron and nickel. 3. Nose wear is usually caused by rubbing of the tool along the machined surface of the workpiece.