flow experiment_data

Your initial message (if any):

Is flow rate increasing, decreasing, etc.?

I would expect the flow to decrease with the decreasing of water pressure.

Is the velocity of the water surface increasing, decreasing, etc.?

I'm not sure if the surface's velocity changes. I know the velocity of water pushing out the exit hole decreases as water level decreases. I would say it would remain the same.

How would the velocity of the water surface, the velocity of the exiting water, the diameter of the cylinder and the diameter of the hole be interrelated?

The velocity of the water exiting the cylinder is directally proportional to the diameter of the hole which it has to flow out of.

The larger diameter of the exit hole, the faster the water would exit that hole. The smaller the exit hole the more pressure the water places on it to get out, so I'd say the smaller the diameter of the exit hole, the faster the velocity of the escaping water.

Explain how we know that a change in velocity implies the action of a force:

According to Newton, a object in motion will stay in motion at a constant until some other force acts upon it.

Does the depth seem to be changing at a regular rate, at a faster and faster rate, or at a slower and slower rate

Mass of the water and gravity accelerate the water from inside the cylinder to outside.

Slower and slower rate.

What do you think a graph of depth vs. time would look like?

It would drop off rapidly at first but start to even out as time went on.

Does the horizontal distance (the distance to the right, ignoring the up and down distance) traveled by the stream increase or decrease as time goes on?

It would decrease

Does this distance change at an increasing, decreasing or steady rate?

decreasing

What do you think a graph of this horizontal distance vs. time would look like?

The distance would be greater at first and then start to drop off as time does on.

The contents of TIMER program as you submitted them:

.8cm length exit hole.

250 - 0

230 - .80

210 - 1.23

190 - .77

170 - 1.28

150 - 1.13

130 - 1.23

110 - 1.37

90 - 1.45

70 - 1.76

50 - 2.00

30 - 3.27

The vertical positions of the large marks as you reported them, relative to the center of the outflow hole

23.5 centimeters to the exit tube.

About 2.2 or so cm difference inbetween 250-230 & 230-210...

Your table for depth (in cm) vs clock time (in seconds)

0,23.5

.8,21.3

1.23,19.1

.77, 16.9

1.28, 14.7

1.13, 12.5

1.23, 10.3

1.37, 8.1

1.45, 5.9

1.76, 3.7

2.00, 1.5

3.27, -.7 but this was just an estimate, this should actually be zero.

Is the depth changing at a regular rate, at a faster and faster rate, or at a slower and slower rate?

My data supports the answers I gave in that the water went rapidly at first and then slowed down over time. Slower and slower rate.

Your description of your depth vs. t graph:

Clock time would always been increasing but the depth would decrease very rapidly at first and have a big slope but as time goes on and water depth decreases you would have a smaller and smaller slope.

Your explanation and list of average average velocities:

Between each measurement there are 20 centimeters difference which is .2m.

.8=.2m/.8sec=.25m/sec

1.23=.2m/1.23sec=.1626m/sec

.2597m/sec

.15625m/s

.17699m/s

.1626m/s

.14598m/s

.1379m/s

.1136m/s

.1m/s

.0611m/s

The midpoints of your time intervals and how you obtained them:

What exactly are you looking for here?

Your table of average velocity of water surface vs. clock time:

Your description of your graph of average velocity vs clock time:

Average velocity vs. clock time.

The x axis would be increasing since its time and the average velocity would be decreasing more slowly towards the end.

Your explanation of how acceleration values were obtained:

Your acceleration vs clock time table:

According to the evidence here, is acceleration increasing, decreasing, staying the same or is in not possible to tell?

13:04:24 01-29-2006