Angular deceleration of a circular saw blade

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The discussion revolves around calculating the angular deceleration of a circular saw blade. A participant initially used a formula that resulted in an incorrect value of 0.399 instead of the expected 7.88 rad/s². Clarification was sought regarding the value of angular velocity (w) used in the calculation. It was confirmed that the angular velocity was given in revolutions per second, which may have contributed to the confusion. Accurate conversion of units is essential for correct calculations in angular motion.
Tikki
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Homework Statement
If a circular saw blade is spinning at a rate of 6.57 revolutions per second, what is the magnitude of the (constant) angular acceleration that needs to be applied on the saw blade to bring it to rest in 17.2 revolutions?
Relevant Equations
theta = no of revs * 2pi
w^2=2a(theta)
I tried the formula I showed up there but got 0.399 instead of 7.88rad/s^2.
 
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What number did you use for w?
 
kuruman said:
What number did you use for w?
6.57rads/s
 
Tikki said:
6.57rads/s
wait a min?
 
Tikki said:
wait a min?
Yup, it is given in revolutions per second.
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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