Phy 232
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.
** Is the velocity of the water surface increasing, decreasing, etc.? **
I would expect the velocity 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? **
I think you could use them all in an equation which may be Bernoulli's Equation.
** Explain how we know that a change in velocity implies the action of a force: **
The change in velocity would mean that the action of the force happens in the beginning and then the velocity drops off.
** Does the depth seem to be changing at a regular rate, at a faster and faster rate, or at a slower and slower rate **
I think the pictures seem to be changing at a steady rate. It would be more helpful if you new at which moments the pictures were taken.
** What do you think a graph of depth vs. time would look like? **
I think it would be a linear graph.
** 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 because the force would be less.
** Does this distance change at an increasing, decreasing or steady rate? **
The distance would probably decrease at a steady rate.
** What do you think a graph of this horizontal distance vs. time would look like? **
I think it would look much like the above graph.
** The contents of TIMER program as you submitted them: **
1 19.6875 19.6875
2 20.75 1.0625
3 21.78125 1.03125
4 22.82813 1.046875
5 23.74219 .9140625
6 25.125 1.382813
7 26.33594 1.210938
8 27.66406 1.328125
9 29.25 1.585938
10 31 1.75
11 33.34375 2.34375
12 37.10938 3.765625
13 39.78125 2.671875
** The vertical positions of the large marks as you reported them, relative to the center of the outflow hole **
1.2
3.2
5.0
6.9
8.8
10.6
12.4
14.2
15.9
17.6
19.2
20.9
** Your table for depth (in cm) vs clock time (in seconds) **
0,20.9
1.06,19.2
2.09,17.6
3.13,15.9
4.04,14.2
5.42,12.4
6.63,10.6
7.95,8.8
9.54,6.9
11.29,5.0
13.63,3.2
17.39,1.4
20.06,0
** Is the depth changing at a regular rate, at a faster and faster rate, or at a slower and slower rate? **
The depth seems to be changing at a pretty steady rate until it gets near the final few marks.
** Your description of your depth vs. t graph: **
It descends to the left and it looks pretty much linear.
** Your explanation and list of average average velocities: **
0
1.60
1.55
1.63
1.30
1.49
1.36
1.19
1.09
0.77
0.48
0.52
I found this by taking the difference in the distance divided by the change in time.
** The midpoints of your time intervals and how you obtained them: **
0.53
1.58
2.61
3.59
4.73
6.03
7.29
8.75
10.42
12.46
15.51
18.73
** Your table of average velocity of water surface vs. clock time: **
0.53,0
1.58,1.60
2.61,1.55
3.59,1.63
4.73,1.30
6.03,1.49
7.29,1.36
8.75,1.19
10.42,1.09
12.46,0.77
15.51,0.48
18.73,0.52
** Your description of your graph of average velocity vs clock time: **
The graph is pretty much linear. Mine is actually basically a straight line. I think I did it right.
** Your explanation of how acceleration values were obtained: **
0
1.01
0.59
0.45
0.27
0.25
0.19
0.14
0.10
0.06
0.03
0.03
I took the average velocity divided by the midpoint clock time. I think this would be right or would you use the time interval instead of clock time?
** Your acceleration vs clock time table: **
0.53,0
1.58,1.01
2.61,0.59
3.59,0.45
4.73,0.27
6.03,0.25
7.29,0.19
8.75,0.14
10.42,0.10
12.46,0.06
15.51,0.03
18.73,0.03
** According to the evidence here, is acceleration increasing, decreasing, staying the same or is in not possible to tell? **
The accelerations seem to decrease. I think the acceleration of the water surface is constant.
** **
1 hour
gr43