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.? **
the flow rate of the exiting water decreases as time passes
** Is the velocity of the water surface increasing, decreasing, etc.? **
the velocity of the water surface decreases as time passes
** 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? **
You would use continuity equation to find the velocity if you had the other values
** Explain how we know that a change in velocity implies the action of a force: **
any change in motion require an applied force. Gravity is the force working on this water system. Friction is also working here.
** 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 is changing at a slower and slower rate
** What do you think a graph of depth vs. time would look like? **
The curve will start high & left, slope downward decreasing at a decreasing rate. Curve opening upward
** 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
** What do you think a graph of this horizontal distance vs. time would look like? **
The curve will start high & left, slope downward decreasing at a increasing rate. Curve opening downward
** The contents of TIMER program as you submitted them: **
1 0 0
2 3.0261 3.026001
3 5.928 2.901978
4 9.094 3.166016
5 12.386 3.291992
6 15.896 3.51001
7 19.8901 3.994019
8 23.868 3.977905
9 28.672 4.804077
10 34.257 5.584961
11 40.825 6.567993
12 49.982 9.156982
** The vertical positions of the large marks as you reported them, relative to the center of the outflow hole **
16.85
15.44
14.03
12.62
11.21
9.80
8.39
6.98
5.57
4.16
2.75
1.34
** Your table for depth (in cm) vs clock time (in seconds) **
0,16.85
3.0261,15.44
5.928,14.03
9.094,12.62
12.386,11.21
15.896,9.8
19.8901,8.39
23.868,6.98
28.672,5.57
34.257,4.16
40.825,2.75
49.982,1.34
** 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 rate
** Your description of your depth vs. t graph: **
The curve will start high & left, slope downward decreasing at a decreasing rate. Curve opening upward, but only slightly sloped
** Your explanation and list of average average velocities: **
Used excel to compute the difference in distance divided by the difference in time
** The midpoints of your time intervals and how you obtained them: **
0
1.51305
4.47705
7.511
10.74
14.141
17.89305
21.87905
26.27
31.4645
37.541
45.4035
Used excel to compute the average time of the clock time and the previous clock time to get the midpoint clock time
** Your table of average velocity of water surface vs. clock time: **
0,0
1.51305,0.466
4.47705,0.486
7.511,0.445
10.74,0.428
14.141,0.402
17.89305,0.353
21.87905,0.354
26.27,0.294
31.4645,0.252
37.541,0.215
45.4035,0.154
** Your description of your graph of average velocity vs clock time: **
The curve will start high & left, slope downward at a steady rate.
** Your explanation of how acceleration values were obtained: **
Used excel to compute the difference in velocity divided by the difference in time
** Your acceleration vs clock time table: **
0,0.0
0.466,0.154
0.486,0.007
0.445,-0.013
0.428,-0.005
0.402,-0.008
0.353,-0.012
0.354,0.000
0.294,-0.013
0.252,-0.007
0.215,-0.006
0.154,-0.007
** According to the evidence here, is acceleration increasing, decreasing, staying the same or is in not possible to tell? **
my data indicates that the acceleration of the water is constant, with the exception of the first couple fo intervals.
The acceleration of the water surface is constant because the acceleration due to gravity is contant.
Calculated average acceleration is -6.29 m/s^2
Your accelerations are on the order of a hundredth of a cm / s^2, and that's about right for this data. It's unclear how you arrived at -6.29 m/s^2.
Gravity force applied is -9.81 m/s^2
The difference is due to the restriction of flow (due to friction) through the out oriface
** **
2 hr
&#Good responses. See my notes and let me know if you have questions. &#