- #1

jaychouf4n

- 6

- 0

## 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