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haruspex's latest activity
haruspex
replied to the thread
How to calculate the velocity of water streaming into the boat?
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For the same reason we do not add ##h_1## to ##h_2## to find the depth just below the hole.
Today, 4:39 PM
haruspex
replied to the thread
How to calculate the velocity of water streaming into the boat?
.
The first equation looks right, but you then dropped a factor of 2.
Today, 4:20 PM
haruspex
replied to the thread
Force between charged particle and conducting cylinder
.
I agree with the words but cannot relate them to your equations. Which of those terms is the external field? (Why would that term...
Today, 6:38 AM
haruspex
replied to the thread
Force between charged particle and conducting cylinder
.
So what field must the induced charge produce in the cylinder?
Today, 5:15 AM
haruspex
replied to the thread
Force between charged particle and conducting cylinder
.
I think the apparent contradiction is explained by the small part of the field that emanates from the sides of the cylinder. But you...
Today, 4:25 AM
haruspex
replied to the thread
Force between charged particle and conducting cylinder
.
If you are looking at the conducting case, what is the net field in the conductor? What does that tell you about the induced charges?
Today, 3:53 AM
haruspex
replied to the thread
Confused about interefence patterns
.
Suppose that at first the polarisation of waves from X is in the plane of the page. Imagine an ant looking at X from B. In the diagram...
Today, 2:02 AM
haruspex
replied to the thread
How to calculate the velocity of water streaming into the boat?
.
Relative to the sinking boat, but it is stationary relative to the surrounding water. Yes, but only until the water has entered the...
Yesterday, 9:24 PM
haruspex
replied to the thread
How to calculate the velocity of water streaming into the boat?
.
That would mean the hole might as well be the full width of the boat, in which case it would sink immediately.
Yesterday, 7:18 PM
haruspex
replied to the thread
Two objects joined by a rectilinear cable rotating
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It says the cable is "rectilinear", i.e. straight.
Yesterday, 7:13 PM
haruspex
replied to the thread
How to calculate the velocity of water streaming into the boat?
.
The pressure below the hole is ##(h_2)\rho g +p_a## and the pressure just above it is ##(h_1)\rho g +p_a##.
Yesterday, 4:41 PM
haruspex
replied to the thread
Two objects joined by a rectilinear cable rotating
.
The problem description makes no sense to me. I cannot come up with a diagram that matches the numbers, and it looks like @Guillem_dlc...
Yesterday, 4:37 PM
haruspex
replied to the thread
How to calculate the velocity of water streaming into the boat?
.
The rate of flow of water into the boat is determined by ##\Delta h##, that in turn determines the rate of sinking, and ##\Delta h##...
Yesterday, 4:33 PM
haruspex
replied to the thread
How to calculate the velocity of water streaming into the boat?
.
There is a pressure a little way outside the hole and a lower one a little way inside. That pressure difference accelerates the water...
Yesterday, 3:37 PM
haruspex
replied to the thread
How to calculate the degrees of freedom of a simple multi-body system?
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Yes, that works. It leads to the conclusion that, adding back a differential and steering, the answer to the original question is 3...
Thursday, 4:21 PM
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