- #1
jaychouf4n
- 6
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Homework Statement
1a . By dividing a uniform narrow bar of length l into a number of small masses, find the moment of inertia of the bar rotating about an axis perpendicular to the bar and passing through its end
1b. use the parallel axis theorem and the result above to find the moment of inertia about an axis parallel to that above passing through the centre of mass of the bar
1c. calculate the moment of inertia of the turbine blade. Each blade has mass m and length l
2. a car with its door open moves off from rest with an acceleration of 10ms-2. how long will it take the door to close
Homework Equations
The Attempt at a Solution
I think i got 1 a) right
I=m(l/10)^2+m(2l/10)^2...+ml^2
=m/100(l^2+(2l)^2...(10l)^2)
=385l^2/100
For the rest I have not really any idea, so any tips would be great
thx thanks =D