4. 19) Two unequal masses m and 2m are attached to a thin bar of negligible mass

Question

4. 19) Two unequal masses m and 2m are attached to a thin bar of negligible mass that rotates about an axis perpendicular to the bar. When m is a distance 2d from the axis and 2m is a distance d from the axis, the moment of inertia of this combination is L If the masses are now interchanged, the moment of inertia will be (Points : 5) 5. 20) A disk starts from rest and rotates with constant angular acceleration. If the angular velocity is w at the end of the first two revolutions, then at the end of the first eight revolutions it will be (Points : 5)

Explanation / Answer

1) w = 10 + (3*5) = 10 + 15 = 25

option E

2) option C

3) option B

4) I = m*4*d^2 + 2*m*d^2 = 6md^2

I' = 2m*4*d^2 + m*4*d^2 = 12m*d^2 = 2I

option D

5)

w = sqrt(2*alfa*s)

w' = sqrt(2*alfa*2s) = sqrt(2)*w

option A

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