#$&*
course phy 242
6/7/2013 around 1:30 pm
You are going to do the following (don't do it yet; predict first what will happen):Punch a hole the side of the bottle, near the bottom.
Insert a piece of tubing into the hole to direct the flow of water from the bottle.
Fill the bottle with water.
Set it on a tabletop or on the counter next to the sink (or on the ledge of a bathtup, etc.--any setup will do as long as the bottle rests on a level surface, and the escaping stream has at least 15 cm to fall before it hits something).
Let the water run out, with the stream falling freely to the surface below.
What do you expect will happen? Answer the following:
Will the water stream tend to travel longer and longer distances before striking the surface below, shorter and shorter distances, or will the distance tend to increase at times and decrease at times? Why do you think the distance traveled by the stream will behave as you say?
****
The water stream will tend to travel shorter and shorter, it will behave this way because as the pressure of the water decreases there will be less pressure through the tube to push out the water. Also through another view, the potential energy of the water is decreasing as the stream travels through the tube.
#$&*
Will the speed of the escaping water increase, decrease, or sometimes increase and sometimes decrease? Explain your thinking.
****
The speed of the escaping water will decrease as the bottle will get empty of water, this is again due to the pressure of the water at the top , as the water decreases the potential energy decreases and the kinetic energy increases so therefore mgh(initial )+ 0 = ½ mv^2(final) +0 so mgh= ½ mv^2 , therefore as the height of the water decreases , the potential energy decreases and so must the speed in the ½ mv^2 since they are equal.
#$&*
Clearly the water level will decrease. Will it decrease more and more quickly, more and more slowly, or sometimes more quickly and sometimes more slowly? Explain your thinking.
****
It will decrease more and more slowly, due to the less pressure cause by less amount of water in the bottle.
#$&*
Now set up and prepare to take some measurements:
Punch or cut a hole about 1/8 inch (.3 cm) in diameter in the side of the bottle, at a point where the side of the bottle is vertical, within a few centimeters of the bottom of the bottle. If you cut the hole, a triangle about 1/8 inch on a side is about right.
Your initial materials will include short open pieces of tubing, one whose diameter is the same as that of the 'cap' on the bottlecap and tube, the other having the same diameter as the tube. Insert the larger of these pieces into the hole. The piece should fit fairly tightly in the hole, so when the bottle is filled much more of the water that flows from the bottle will flow through the tube rather than around it. You can test this by filling the bottle, placing your thumb over the end of the tube, and seeing how much water leaks out. Then move your thumb and verify that the water flows out much more rapidly.
Mark three points on the bottle, one at the top of the cylindrical section of the bottle, one halfway between the first mark and the hole, and one halfway between the second mark and the hole. Measure the three distances, relative the the hole, with reasonable accuracy.
You will set the bottle it a vertical position and release your thumb. You will time the fall of the water level, reporting the clock times at which the water reaches the first mark, and each subsequent mark.
You will report the vertical positions of the three lines, relative to the hole, and the observed clock times. Your data will be used to determine the duration of each of three intervals:
During the first interval the water level falls from the highest mark to the second-highest.
During the second interval the water level falls from the second mark to the third.
During the third interval the water level falls from the third mark to level of the hole. The water will be considered to have reached the level of the hole when it starts falling from the bottle in separate drops rather than a stream or a continuous series of drops.
Before you actually perform the experiment make some additional predictions:
Which of the four intervals will last the longest, and which will be the shortest?
****
The last interval from which it goes from the third mark to the level hole will take the longest and the second interval going from second mark to the third mark will be the shortest.
#$&*
List the predicated intervals in order, from the longest to the shortest, and explain your thinking:
****
Third mark to the hole, first mark to the second mark, second mark to the third mark. The first has the longer height to flow the water out but it must be considered that it does have the highest potential energy so therefore it will take it a medium amount of time, the second interval has the shorter height than that of the first interval but it still has a higher potential energy than that of the third interval. The third interval has the least potential energy and the least height so it will take longer time to finish the water flow.
#$&*
Did you predict the order of the four intervals correctly?
****
I believe that the order of the four intervals is correct.
#$&*
Now run your first trial. (You will also run a second trial, in which the short piece of thinner tubing is inserted into the larger piece to narrow the flow).
Report your data, and explain what it means. If you used the TIMER include a copy of the display of times (you can just copy and paste the display into a document).
****
Length(inches) Time Interval(seconds)
2.1 11.2
1.05 7.2
1.05 16.2
The above data was gained from the using of iphone timer. The data demonstrates that from the second mark to the third mark it takes the least time while from the third mark to the hole takes the longest as predicted above. This proves that potential energy as well as kinetic energy of the system runs the flow of the water.
#$&*
Determine, as accurately as you can using a clock or watch with a second hand, the clock times at which the water reaches the first mark, the second, the third and the clock time at which the flow from the hole reduces to the point where it leaves the hole in distinct drops.
Run your second trial, in which the short piece of thinner tubing is inserted into the larger piece to narrow the flow.
Report your data, and explain what it means. If you used the TIMER include a copy of the display of times (you can just copy and paste the display into a document).
****
Length (inches) Time Interval (seconds)
2.1 8.4
1.05 6.5
1.05 5.3
As seen from the data above, as the piece of the inner tubing is inserted into the larger piece to narrow the flow, the water flows faster because there is a higher pressure. From the formula Pressure = Force/ area, we can see that as the area of the tube decreased the pressure increased as shown by the equation.
#$&*
Determine, as accurately as you can using a clock or watch with a second hand, the clock times at which the water reaches the first mark, the second, the third and the clock time at which the flow from the hole reduces to the point where it leaves the hole in distinct drops.
"
Self-critique (if necessary):
------------------------------------------------
Self-critique rating:
#$&*
course phy 242
6/7/2013 around 1:30 pm
You are going to do the following (don't do it yet; predict first what will happen):Punch a hole the side of the bottle, near the bottom.
Insert a piece of tubing into the hole to direct the flow of water from the bottle.
Fill the bottle with water.
Set it on a tabletop or on the counter next to the sink (or on the ledge of a bathtup, etc.--any setup will do as long as the bottle rests on a level surface, and the escaping stream has at least 15 cm to fall before it hits something).
Let the water run out, with the stream falling freely to the surface below.
What do you expect will happen? Answer the following:
Will the water stream tend to travel longer and longer distances before striking the surface below, shorter and shorter distances, or will the distance tend to increase at times and decrease at times? Why do you think the distance traveled by the stream will behave as you say?
****
The water stream will tend to travel shorter and shorter, it will behave this way because as the pressure of the water decreases there will be less pressure through the tube to push out the water. Also through another view, the potential energy of the water is decreasing as the stream travels through the tube.
#$&*
Will the speed of the escaping water increase, decrease, or sometimes increase and sometimes decrease? Explain your thinking.
****
The speed of the escaping water will decrease as the bottle will get empty of water, this is again due to the pressure of the water at the top , as the water decreases the potential energy decreases and the kinetic energy increases so therefore mgh(initial )+ 0 = ½ mv^2(final) +0 so mgh= ½ mv^2 , therefore as the height of the water decreases , the potential energy decreases and so must the speed in the ½ mv^2 since they are equal.
#$&*
Clearly the water level will decrease. Will it decrease more and more quickly, more and more slowly, or sometimes more quickly and sometimes more slowly? Explain your thinking.
****
It will decrease more and more slowly, due to the less pressure cause by less amount of water in the bottle.
#$&*
Now set up and prepare to take some measurements:
Punch or cut a hole about 1/8 inch (.3 cm) in diameter in the side of the bottle, at a point where the side of the bottle is vertical, within a few centimeters of the bottom of the bottle. If you cut the hole, a triangle about 1/8 inch on a side is about right.
Your initial materials will include short open pieces of tubing, one whose diameter is the same as that of the 'cap' on the bottlecap and tube, the other having the same diameter as the tube. Insert the larger of these pieces into the hole. The piece should fit fairly tightly in the hole, so when the bottle is filled much more of the water that flows from the bottle will flow through the tube rather than around it. You can test this by filling the bottle, placing your thumb over the end of the tube, and seeing how much water leaks out. Then move your thumb and verify that the water flows out much more rapidly.
Mark three points on the bottle, one at the top of the cylindrical section of the bottle, one halfway between the first mark and the hole, and one halfway between the second mark and the hole. Measure the three distances, relative the the hole, with reasonable accuracy.
You will set the bottle it a vertical position and release your thumb. You will time the fall of the water level, reporting the clock times at which the water reaches the first mark, and each subsequent mark.
You will report the vertical positions of the three lines, relative to the hole, and the observed clock times. Your data will be used to determine the duration of each of three intervals:
During the first interval the water level falls from the highest mark to the second-highest.
During the second interval the water level falls from the second mark to the third.
During the third interval the water level falls from the third mark to level of the hole. The water will be considered to have reached the level of the hole when it starts falling from the bottle in separate drops rather than a stream or a continuous series of drops.
Before you actually perform the experiment make some additional predictions:
Which of the four intervals will last the longest, and which will be the shortest?
****
The last interval from which it goes from the third mark to the level hole will take the longest and the second interval going from second mark to the third mark will be the shortest.
#$&*
List the predicated intervals in order, from the longest to the shortest, and explain your thinking:
****
Third mark to the hole, first mark to the second mark, second mark to the third mark. The first has the longer height to flow the water out but it must be considered that it does have the highest potential energy so therefore it will take it a medium amount of time, the second interval has the shorter height than that of the first interval but it still has a higher potential energy than that of the third interval. The third interval has the least potential energy and the least height so it will take longer time to finish the water flow.
#$&*
Did you predict the order of the four intervals correctly?
****
I believe that the order of the four intervals is correct.
#$&*
Now run your first trial. (You will also run a second trial, in which the short piece of thinner tubing is inserted into the larger piece to narrow the flow).
Report your data, and explain what it means. If you used the TIMER include a copy of the display of times (you can just copy and paste the display into a document).
****
Length(inches) Time Interval(seconds)
2.1 11.2
1.05 7.2
1.05 16.2
The above data was gained from the using of iphone timer. The data demonstrates that from the second mark to the third mark it takes the least time while from the third mark to the hole takes the longest as predicted above. This proves that potential energy as well as kinetic energy of the system runs the flow of the water.
#$&*
Determine, as accurately as you can using a clock or watch with a second hand, the clock times at which the water reaches the first mark, the second, the third and the clock time at which the flow from the hole reduces to the point where it leaves the hole in distinct drops.
Run your second trial, in which the short piece of thinner tubing is inserted into the larger piece to narrow the flow.
Report your data, and explain what it means. If you used the TIMER include a copy of the display of times (you can just copy and paste the display into a document).
****
Length (inches) Time Interval (seconds)
2.1 8.4
1.05 6.5
1.05 5.3
As seen from the data above, as the piece of the inner tubing is inserted into the larger piece to narrow the flow, the water flows faster because there is a higher pressure. From the formula Pressure = Force/ area, we can see that as the area of the tube decreased the pressure increased as shown by the equation.
#$&*
Determine, as accurately as you can using a clock or watch with a second hand, the clock times at which the water reaches the first mark, the second, the third and the clock time at which the flow from the hole reduces to the point where it leaves the hole in distinct drops.
"
Self-critique (if necessary):
------------------------------------------------
Self-critique rating:
#*&!
#$&*
course phy 242
6/7/2013 around 1:30 pm
You are going to do the following (don't do it yet; predict first what will happen):Punch a hole the side of the bottle, near the bottom.
Insert a piece of tubing into the hole to direct the flow of water from the bottle.
Fill the bottle with water.
Set it on a tabletop or on the counter next to the sink (or on the ledge of a bathtup, etc.--any setup will do as long as the bottle rests on a level surface, and the escaping stream has at least 15 cm to fall before it hits something).
Let the water run out, with the stream falling freely to the surface below.
What do you expect will happen? Answer the following:
Will the water stream tend to travel longer and longer distances before striking the surface below, shorter and shorter distances, or will the distance tend to increase at times and decrease at times? Why do you think the distance traveled by the stream will behave as you say?
****
The water stream will tend to travel shorter and shorter, it will behave this way because as the pressure of the water decreases there will be less pressure through the tube to push out the water. Also through another view, the potential energy of the water is decreasing as the stream travels through the tube.
#$&*
Will the speed of the escaping water increase, decrease, or sometimes increase and sometimes decrease? Explain your thinking.
****
The speed of the escaping water will decrease as the bottle will get empty of water, this is again due to the pressure of the water at the top , as the water decreases the potential energy decreases and the kinetic energy increases so therefore mgh(initial )+ 0 = ½ mv^2(final) +0 so mgh= ½ mv^2 , therefore as the height of the water decreases , the potential energy decreases and so must the speed in the ½ mv^2 since they are equal.
#$&*
Clearly the water level will decrease. Will it decrease more and more quickly, more and more slowly, or sometimes more quickly and sometimes more slowly? Explain your thinking.
****
It will decrease more and more slowly, due to the less pressure cause by less amount of water in the bottle.
#$&*
Now set up and prepare to take some measurements:
Punch or cut a hole about 1/8 inch (.3 cm) in diameter in the side of the bottle, at a point where the side of the bottle is vertical, within a few centimeters of the bottom of the bottle. If you cut the hole, a triangle about 1/8 inch on a side is about right.
Your initial materials will include short open pieces of tubing, one whose diameter is the same as that of the 'cap' on the bottlecap and tube, the other having the same diameter as the tube. Insert the larger of these pieces into the hole. The piece should fit fairly tightly in the hole, so when the bottle is filled much more of the water that flows from the bottle will flow through the tube rather than around it. You can test this by filling the bottle, placing your thumb over the end of the tube, and seeing how much water leaks out. Then move your thumb and verify that the water flows out much more rapidly.
Mark three points on the bottle, one at the top of the cylindrical section of the bottle, one halfway between the first mark and the hole, and one halfway between the second mark and the hole. Measure the three distances, relative the the hole, with reasonable accuracy.
You will set the bottle it a vertical position and release your thumb. You will time the fall of the water level, reporting the clock times at which the water reaches the first mark, and each subsequent mark.
You will report the vertical positions of the three lines, relative to the hole, and the observed clock times. Your data will be used to determine the duration of each of three intervals:
During the first interval the water level falls from the highest mark to the second-highest.
During the second interval the water level falls from the second mark to the third.
During the third interval the water level falls from the third mark to level of the hole. The water will be considered to have reached the level of the hole when it starts falling from the bottle in separate drops rather than a stream or a continuous series of drops.
Before you actually perform the experiment make some additional predictions:
Which of the four intervals will last the longest, and which will be the shortest?
****
The last interval from which it goes from the third mark to the level hole will take the longest and the second interval going from second mark to the third mark will be the shortest.
#$&*
List the predicated intervals in order, from the longest to the shortest, and explain your thinking:
****
Third mark to the hole, first mark to the second mark, second mark to the third mark. The first has the longer height to flow the water out but it must be considered that it does have the highest potential energy so therefore it will take it a medium amount of time, the second interval has the shorter height than that of the first interval but it still has a higher potential energy than that of the third interval. The third interval has the least potential energy and the least height so it will take longer time to finish the water flow.
#$&*
Did you predict the order of the four intervals correctly?
****
I believe that the order of the four intervals is correct.
#$&*
Now run your first trial. (You will also run a second trial, in which the short piece of thinner tubing is inserted into the larger piece to narrow the flow).
Report your data, and explain what it means. If you used the TIMER include a copy of the display of times (you can just copy and paste the display into a document).
****
Length(inches) Time Interval(seconds)
2.1 11.2
1.05 7.2
1.05 16.2
The above data was gained from the using of iphone timer. The data demonstrates that from the second mark to the third mark it takes the least time while from the third mark to the hole takes the longest as predicted above. This proves that potential energy as well as kinetic energy of the system runs the flow of the water.
#$&*
Determine, as accurately as you can using a clock or watch with a second hand, the clock times at which the water reaches the first mark, the second, the third and the clock time at which the flow from the hole reduces to the point where it leaves the hole in distinct drops.
Run your second trial, in which the short piece of thinner tubing is inserted into the larger piece to narrow the flow.
Report your data, and explain what it means. If you used the TIMER include a copy of the display of times (you can just copy and paste the display into a document).
****
Length (inches) Time Interval (seconds)
2.1 8.4
1.05 6.5
1.05 5.3
As seen from the data above, as the piece of the inner tubing is inserted into the larger piece to narrow the flow, the water flows faster because there is a higher pressure. From the formula Pressure = Force/ area, we can see that as the area of the tube decreased the pressure increased as shown by the equation.
#$&*
Determine, as accurately as you can using a clock or watch with a second hand, the clock times at which the water reaches the first mark, the second, the third and the clock time at which the flow from the hole reduces to the point where it leaves the hole in distinct drops.
"
Self-critique (if necessary):
------------------------------------------------
Self-critique rating:
#*&!#*&!
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