number 10 10. You just can\'t stop playing whatever iteration of Warcraft is pop
ID: 1460671 • Letter: N
Question
number 10
10. You just can't stop playing whatever iteration of Warcraft is popular these days You create a grinding stone, which is a large, spinning stone wheel that can be used to sharpen axes, swords, or whatever sharp, pointy-thing you want sharpened (I'm told that you need Blacksmithing and 3x Heavy Stone). The stone may be thought of as a cylindrical disk of radius 0.350 m. If a constant force of 250 N is applied tangentially and produces an angular acceleration of 0.750 radians/s^2, what is that mass of the stone wheel? (The moment of inertia for a cylindrical disk, or ahem. s wheel, is I=1/2MR^2.)Explanation / Answer
10)
Let M is the mass of spinning stone.
Moment of Inertia of the disk, I = (1/2)*M*R^2
= (1/2)*M*0.35^2
= 0.06125*M
Torque, T = F*R*sin(90)
= 250*0.35
= 87.5 N.m
angular acceleration, alfa = 0.75 rad/s^2
we know, Torque = I*alfa
87.5 = 0.06125*M*0.75
==> M = 87.5/(0.06125*0.75)
= 1905 kg <<<<<--------Answer
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