This document contains my responses to your work. I'm out of town and unable to post the response to your access page. I will post my comments when I return sometime this upcoming weekend.
My comments are bracketed by the HTML tags and
.
Your 'flow experiment' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** Your initial message (if any): **
** Is flow rate increasing, decreasing, etc.? **
I would expect the rate of flow to decrease as water flows from the cylinder
** Is the velocity of the water surface increasing, decreasing, etc.? **
I would expect the velocity of the water surface of the buoy to decrease
** 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 exiting water would increase as the diameter of the hole in the cylinder is larger, because the water would be exiting at a faster rate. The diameter of the cylinder would determine how much water could be help in the cylinder.
** Explain how we know that a change in velocity implies the action of a force: **
If the water in the exiting hole has been accelerated, it means that it is coming out of the hole at a faster rate which increases the velocity of the exiting water. We know that a change in velocity implies the action of a force because if the velocity changes, for example increase, we know that the force of the water exiting the hole has also increases. If the velocity decreases, then the action of a force of the water exiting the hole has decreased.
** Does the depth seem to be changing at a regular rate, at a faster and faster rate, or at a slower and slower rate **
the depth would increase at a slower rate because as the water depth becomes closer to the hole, the rate at which the water is exiting the hole will decrease and become slower
** What do you think a graph of depth vs. time would look like? **
As the depth would decrease, the time would increase because as the water is coming out of the hole, the depth decreases and the time it takes for the depth to decrease becomes larger as it does decrease in the cylinder
** 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? **
The horizontal distance decreases as time goes on
** Does this distance change at an increasing, decreasing or steady rate? **
it changes at a decreasing rate.
** What do you think a graph of this horizontal distance vs. time would look like? **
I think that if the time was on the x axis and the time was on the y axis, as the time increased, the distance would be decreasing.
** The contents of TIMER program as you submitted them: **
1 3289.359 3289.359
2 3290.75 1.390625
3 3292.469 1.71875
4 3294.266 1.796875
5 3296.375 2.109375
6 3298.531 2.15625
7 3300.953 2.421875
8 3303.547 2.59375
9 3306.047 2.5
10 3308.969 2.921875
11 3312.719 3.75
12 3317.010 4.291
** The vertical positions of the large marks as you reported them, relative to the center of the outflow hole **
1 cm
1.9 cm
3.5 cm
5.1 cm
6.6 cm
8.4 cm
9.8 cm
11.2 cm
12.8 cm
14.2 cm
15.6 cm
17.1 cm
** Your table for depth (in cm) vs clock time (in seconds) **
0, 17.1 cm
1.39, 16.6 cm
3.11, 14.2 cm
4.9, 12.8 cm
7.01, 11.2 cm
9.17, 9.8 cm
11.59,8.4 cm
13.68, 6.6 cm
16.6, 5.1 cm
19.61, 3.5 cm
23.36, 1.9 cm
27.65, 1 cm
** 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 that i gave above
The depth is changing at a slower and slower rate.
** Your description of your depth vs. t graph: **
The depth is on the Y axis and the clock time is on the X axis. As the time increases, the depth decreases.
** Your explanation and list of average average velocities: **
0
.73
.49
.35
.32
.26
.24
.23
.19
.20
.24
.25
These average velocities were obtained by dividing the change in time by the change in the depth and these velocities were found above.
** The midpoints of your time intervals and how you obtained them: **
** Your table of average velocity of water surface vs. clock time: **
0,0
1.39, .73
3.11, .49
4.9, .35
7.01, .32
9.17,.26
11.59, .24
13.68, .23
16.69, .19
23.36, .20
27.65, .24
** Your description of your graph of average velocity vs clock time: **
As the clock time would increase, the average velocity would decrease on the graph. Near the end, there were a couple of average velocities that do not go by this, and I think it might be because of uncertainty in the observations or because of a mistake while doing the experiment.
** Your explanation of how acceleration values were obtained: **
you would find the average acceleration by changing in velocity / clock times.
.52
.14
.08
.014
.027
.008
.003
.016
.003
.010
.009
** 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? **
inconclusive
decreasing
** **
about 1.5-2 hours
Good work on this experiment.