An aluminum cube, $2\mathrm{.}0$ cm on a side, and an iron cube, $1\mathrm{.}0$ cm on a side, are connected by a thin, rigid rod $($negligible mass$)65$ cm long. The device is immersed in water in two different ways $($Figure $1).$ The density of water is $1000k\frac{g}{m^3},$ the density of aluminum is $2700k\frac{g}{m^3},$ and the density of iron is $7800k\frac{g}{m^3}.$

Part A

To balance the rod horizontally on your finger underwater, how far from the iron block is your finger?

Express your answer with the appropriate units.

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Request Answer

Part B

You place the rod vertically as shown in part b of $($Figure $1)$ and release it$.$ If the two cubes fall perfectly vertically, estimate their resulting vertical acceleration.

Express your answer with the appropriate units.

$a=$

Part C

Choose the likely alignment of the two cubes $($if they are not perfectly vertically aligned$).$

Al cube would tend to stay above the Fe cube.

Fe cube would tend to stay above the Al cube.

The cubes would keep a horizontal alignment.