- 47

- 0

Hi,I have a problem here and would appreciate it if someone could help me out. I seem to know just one Question out of the 5 q's and seem to have difficulty in trying to figure out the answer. I feel so dumb right now.

Here it is.

http://img62.imageshack.us/img62/4361/physicsdn2.jpg [Broken]

Jennifer

Here it is.

http://img62.imageshack.us/img62/4361/physicsdn2.jpg [Broken]

**A cylindrical shaped pipe can carry water from a very large elevated container on the left to a lower container on the right. The area of the wider portion of the pipe containing the point b has a cross sectional area of 7.80 X 10^-3 m^2 and the narrower section containing points c and d has a cross sectional area of 3.14 x 106-4 m^2.**

Point C is at a height of y2=2m above point d. A water valve closes the elevated container at point a and thus there is initially only water in the upper container and none in the pipe. The rectangular block has dimensions 10cm x 3cms x 3cms and mass of 0.075KG and it rests on the bottom of the lower container before any water enters the lower container

Q1.If the pressure at the surface is 1atm,what is the absolute pressure at point a which is at a depth of y1=2 meters below the surface of the water in the tank?

Ans. I have no clue.

Now the valve at point A is opened.

Q2. Consider the pressure at points b and c. At which of these points is the pressure least?

Ans. I am sure it is B

Q3. If the speed of the water at point b is 6m/sec,whats the speed at point c?

Q4. Determine the speed at point D where the water initially enters the lower container.

Q5. As the water level rises in the lower container,the block eventually begins to float. What is the height h of the water level at the instant the block is lifted off the bottom of the container,ie. the block begins to float?

Point C is at a height of y2=2m above point d. A water valve closes the elevated container at point a and thus there is initially only water in the upper container and none in the pipe. The rectangular block has dimensions 10cm x 3cms x 3cms and mass of 0.075KG and it rests on the bottom of the lower container before any water enters the lower container

Q1.If the pressure at the surface is 1atm,what is the absolute pressure at point a which is at a depth of y1=2 meters below the surface of the water in the tank?

Ans. I have no clue.

Now the valve at point A is opened.

Q2. Consider the pressure at points b and c. At which of these points is the pressure least?

Ans. I am sure it is B

Q3. If the speed of the water at point b is 6m/sec,whats the speed at point c?

Q4. Determine the speed at point D where the water initially enters the lower container.

Q5. As the water level rises in the lower container,the block eventually begins to float. What is the height h of the water level at the instant the block is lifted off the bottom of the container,ie. the block begins to float?

Jennifer

Last edited by a moderator: