Rotating CoLT: Fluid Statics & Dynamics

Instructions: Split students into groups of 2-3. Hand out copies of this sheet and have each group discuss. Afterwards, discuss all together.

1. Assume there is anicecube in aglass of water. When theicecubemelts, will the water level have risen, fallen, or remained the same? Why?

2. In the presence of air, the small iron ball and large plastic ball balance each other. When air is evacuated will the larger ball rise, fall or remain in place?

3. An incompressible fluid is flowing to the right in a pipe that has three segments of different cross-sectional areas A1, A2, and A3. If A1 > A3 > A2, rank the order of the water levels in the tubes from highest to lowest. Explain why.

A1A2 A3

4. A flask of water rests on a scale that reads 100 N. Then, a small block of unknown material is held completely submerged in the water. The block does not touch any part of the flask, and the person holding the block will not tell you whether the block is being pulled up (keeping it from falling further) or pushed down (keeping it from bobbing back up). What is the new reading on the scale (greater, less, same)?