flow experiment_data

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 would decrease as the water flows out of the cylinder.

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?

with the diameter of the cylinder and hole you can find the C.S. area for the cylinder and hole. then with the velocity of the exiting water you can find the velocity of the water surface. to find the velocity you take (V_exit times A_exit)/A_cylinder and that will find the velocity of the water surface.

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

because if the velocity is not changing then the water depth will moving at the same rate as the water exiting. and the C.S. area of the hole and the cylinder are not the same so that can not happen. a force is what makes the water move faster coming out of the hole.

I think the nature of the force is the pressure that the water has on the hole because the hole is so small and their is so much water wanting to come out of 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

the depth is changing a a slower and slower rate

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

the slope will decerease as the clock time increases. the graph will look like a y=1/x(squared) 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?

the horizontal distance traveled by the stream decreases as time goes on

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

i think the distance changes at a decreasing rate

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

i think the graph will look like the depth vs. clock time graph. it will also look like a y=1/x(squared) graph

The contents of TIMER program as you submitted them:

2.7 cm tube length

1.19

1.86

1.84

1.89

2.20

2.25

2.73

2.71

3.48

3.89

6.13

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

1.73

3.46

5.19

6.92

8.65

10.38

12.11

13.84

15.57

17.30

19.03

20.78

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

0,20.78

1.19,19.03

3.05,17.30

4.89,15.57

6.78,13.84

8.98,12.11

11.23,10.38

13.96,8.65

16.67,6.92

20.15,5.19

24.04,3.46

30.17,1.73

Is the depth 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

Your description of your depth vs. t graph:

the graph is decreasing at an exponitional rate. like a y=1/x(squared)

Your explanation and list of average average velocities:

I take (v2-v1)/(t2-t1) to find the average velocity

-1.47

-.93

-.94

-.92

-.78

-.77

-.63

-.64

-.50

-.44

-.28

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

i took the (t1+t2)/2

.595

1.525

1.85

1.865

2.045

2.225

2.49

2.72

3.095

3.685

5.01

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

.595,-1.47

1.525,-.93

1.85,-.94

1.865,-.92

2.045,-.78

2.225,-.77

2.49,-.63

2.72,-.64

3.095,-.50

3.685,-.44

5.01,-.28

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

if i use the negative number for the velocity then the graph is increase to zero and the slope is decreaseing as the clock time is incereasing. Some of the numbers are not in the line but spread out around a line that would best fit the points.

Your explanation of how acceleration values were obtained:

i took the (average velocity)/(clock time)

-2.47

-.61

-.51

-.49

-.38

-.35

-.25

-.24

-.16

-.12

-.06

Your acceleration vs clock time table:

.595,-2.47

1.525,-.61

1.85,-.51

1.865,-.49

2.045,-.38

2.225,-.35

2.49,-.25

2.72,-.24

3.095,-.16

3.685,-.12

5.01,-.06

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

if you dont include the first acceleration time then the data shows that the acceleration of the water surface is decreasing.

i think the acceleration of the water surface is actually decreasing as the data shows. 13:04:16 01-29-2006