haruspex's latest activity
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haruspex replied to the thread Variable mass system : water sprayed into a moving container.My approach was: When the cart has moved s from the cannon, how much water has the cannon ejected? How much of that has reached the... -
haruspex replied to the thread I've come across another fluid pressure problem I don't understand.Then you drew the triangle representing the valve the wrong way up.
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haruspex replied to the thread I've come across another fluid pressure problem I don't understand.I do not understand the function of the check valve here. It is drawn as though allowing flow upwards, which means admitting air if the...
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haruspex replied to the thread Minimum mass of a block.In your fifth equation, the one ending …16-1)=0, check where that -1 comes from. It should be something else. Also, having obtained a...
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haruspex replied to the thread Spherical capacitor RC system -- determine steady state charges.I repeat: And your working, of course.
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haruspex replied to the thread Acceleration of a wedge: What forces act on the wedge?.No. You have confused yourself by drawing the forces on the wedge and the block in the same diagram. Draw two separate FBDs.
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haruspex replied to the thread Acceleration of a wedge: What forces act on the wedge?.The simplest way to think of it is to include the portion of the rope in contact with the pulley as being part of the wedge+pulley...
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haruspex replied to the thread Minimum mass of a block.Really?
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haruspex replied to the thread Minimum mass of a block.What has the spring to do with it? When the system is released from rest, is the spring relaxed, at equilibrium with its suspended...
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haruspex replied to the thread Spherical capacitor RC system -- determine steady state charges.Please post your result and the official result if known.
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haruspex replied to the thread Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations.Then I misinterpreted your last diagram. I now presume it is a top view. That being so, a given movement of the piston raises twice...
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haruspex replied to the thread Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations.The lower portion is not raising any water, only moving it sideways.
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haruspex replied to the thread Errors and significant figures.Just a follow-up on the equation I gave in post #18… I felt it was surprisingly inelegant, then I realised it could be rewritten as...
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haruspex replied to the thread Errors and significant figures.Part of the problem is that there are two common systems which many (most) conflate. Either imply the uncertainty from the number of...
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When I was a practicing EE, none of this ever made sense to me. These problems rarely mention the probability distribution of the data...
