PHY 202
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.? **
as time increases, 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? **
v(ws) = velocity water surface
v(ew) = velocity exiting water
d(c) = diameter cylinder
d(h) = diameter hole
[(v(ws))/(d(c))] = [(v(ew))/(d(h))]
** Explain how we know that a change in velocity implies the action of a force: **
with no action of a force, the velocity would remain constant. gravity
on the mass of the water causes the change in velocity as the mass of
the water decreases.
** 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 seems to be changing at a regular rate.
** What do you think a graph of depth vs. time would look like? **
the graph would be decreasing at a decreasing rate
** 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? **
decrease
** Does this distance change at an increasing, decreasing or steady rate? **
increasing rate
** What do you think a graph of this horizontal distance vs. time would look like? **
decreasing at an increasing rate
** The contents of TIMER program as you submitted them: **
1 0 0
2 2.609375 2.609375
3 4.929688 2.320313
4 7.460938 2.53125
5 10.11719 2.65625
6 16.21094 6.09375
7 19.625 3.414063
8 23.48438 3.859375
9 28.26563 4.78125
10 34.4375 6.171875
11 44.47656 10.03906
** The vertical positions of the large marks as you reported them, relative to the center of the outflow hole **
1.3
4.3
7.3
10.3
13.3
16.3
19.3
22.3
25.3
28.3
31.3
34.3
** Your table for depth (in cm) vs clock time (in seconds) **
0, 34.3
2.61, 31.3
4.93, 28.3
7.46, 25.3
10.12, 22.3
16.21, 19.3
19.63, 16.3
23.48, 13.3
28.27, 10.3
34.44, 7.3
44.48, 4.3
** Is the depth changing at a regular rate, at a faster and faster rate, or at a slower and slower rate? **
depth is changing at a slower and slower rate
** Your description of your depth vs. t graph: **
curved graph which is decreaseing at a decreasing rate
** Your explanation and list of average average velocities: **
I used the displacement from each timer click, and the time interval between those clicks and divided 'ds/'dt to find the average velocities.
1.15 cm/s
1.29 cm/s
1.19 cm/s
1.13 cm/s
0.49 cm/s
0.88 cm/s
0.78 cm/s
0.63 cm/s
0.49 cm/s
0.30 cm/s
** The midpoints of your time intervals and how you obtained them: **
** Your table of average velocity of water surface vs. clock time: **
** Your description of your graph of average velocity vs clock time: **
** 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? **
** **
90 minutes
&#Good responses. Let me know if you have questions. &#