From Bernoulli\'s energy conservation equation, if you have a large water tank w
ID: 1836950 • Letter: F
Question
From Bernoulli's energy conservation equation, if you have a large water tank which is filled with water and attach a hose to a hole in the bottom of the tank, you should be able to spray water only as high as the surface of the water in the tank. You try this with a 1/4" diameter hose and you find that the stream of water does not go high enough to come even close to the surface of the water at the top of the tank. This happens because:
Bernoulli's equation works only for a hole in the tank, not a hose.
energy is lost due to interactions of the water with the walls of the hose.
energy is lost to the external electric field.
energy is lost to the external magnetic field.
2.
In the last question, if the 1/4" hose is replaced by a 1" hose, then the water begins to spray much higher. This happens because
the larger hose makes the tank lose water faster.
the larger hose means that more of the water can move through the hose without coming into close contact with the hose walls.
the larger hose adds energy to the water allowing the water to go higher.
there is a pump which pressurizes the water and so it goes higher.
3. To see the effect of magnus forces in Soccer, look at
http://youtube.com/watch?v=RRqS-dKXHEM
If you are facing the goal, in order to get the ball to curve to the left which side of the soccer ball as it spins should be approaching you?
top
bottom
left
right
4. In the previous question, as you see the ball go into the goal curving left, which way should air be deflected by the spinning ball?
right
left
up
down
the larger hose makes the tank lose water faster.
the larger hose means that more of the water can move through the hose without coming into close contact with the hose walls.
the larger hose adds energy to the water allowing the water to go higher.
there is a pump which pressurizes the water and so it goes higher.
3. To see the effect of magnus forces in Soccer, look at
http://youtube.com/watch?v=RRqS-dKXHEM
If you are facing the goal, in order to get the ball to curve to the left which side of the soccer ball as it spins should be approaching you?
top
bottom
left
right
4. In the previous question, as you see the ball go into the goal curving left, which way should air be deflected by the spinning ball?
right
left
up
down
Explanation / Answer
1) energy is lost due to interactions of the water with the walls of the hose.
As water jets out of the hose, water losses some energy due to the collisions at the hose exit and the water cannot raise to the original height.
2) the larger hose means that more of the water can move through the hose without coming into close contact with the hose walls.
The collisions at the walls of the hose will be les with a wider hose and the loss of energy is less and can raie higher.
3) right, The ball spining in vertical diredction as kick on the rigth side it wil curvw to the left. The spn in vertical direction help the ball mantain its path and reflect.
4) right, as the air deflects right the ball will move to the left.
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