Answer:
2
Explanation:To find the solution we must first make the transformations to international units,
In this way:
Inches of length (L) to feet =
So we can identify the area by hour:
Once the area is identified, we now identify the number of passes required,
Passes required = Area x number of passes
We transform speed to international units
So we can identify the covered area
where
m = drum widht
p = efficiency
In this way we obtain the number of rollers given by:
No. of Rollers = Passes required / covered area
No of rollers = 48136/40269
No of rollers = 1.19, that is, 2
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Answer with Explanation:
Stress is defined as the force acting per unit area on a material.
Mathematically
where
is the stress , is an infinitesimal force that acts on an infinitesimal area
When a body is under stress it's dimensions change and this change in dimensions is known as strain.
Mathematically
where
strain in the object
is the change in any dimension of the body
Now in the above relation of stress, the area involved also changes when the body is loaded as the load produces strain which changes the dimensions of the body.
Now while calculating the stress if we use the original area of the cross section of the body prior to loading the stress that we calculate is the engineering stress and the strain associated with it is the engineering strain.
On the other hand if we use the true cross section of the body when it is loaded the stress that we calculate is the true stress and the strain associated with it is the true strain.
Mathematically they are related as
Thus the true stress is found to be larger than engineering stress.
Answer:
The correct option is;
c. Leaving the chuck key in the drill chuck
Explanation:
A Common safety issues with a drill press leaving the chuck key in the drill chuck
It is required that, before turning the drill press power on, ensure that chuck key is removed from the chuck. A self ejecting chuck key reduces the likelihood of the chuck key being accidentally left in the chuck.
It is also required to ensure that the switch is in the OFF position before turning plugging in the power cable
Be sure that the chuck key is removed from the chuck before turning on the power. Using a self-ejecting chuck key is a good way of insuring that the key is not left in the chuck accidentally. Also to avoid accidental starting, make sure the switch is in the OFF position before plugging in the cord. Always disconnect the drill from the power source when making repairs.