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A sheep can climb up a wall with an 80° batter. The aim should be to cap the wall with a low vertical fence that will prevent the sheep...

A 4D sphere is a hypersphere. https://en.wikipedia.org/wiki/3-sphere#Properties

I have no permitted access to that link, but the 1959 book is available from...

No. I wrote "spreading radially", not "spreading rapidly".

The outlet of the fan has an area of π * 152 = 707 cm2. The circumference of the fan outlet is π * 30 cm = 94.25 cm. The area of the...

What is the axial separation, between the fan outlet, and the circular plate?

Two particles could define a rigid body. There will always be special cases that are inconvenient. I see no reason to restrict the...

A rigid body is a system of particles with fixed locations relative to each other.

No, we do not. Are you suggesting that a sharp corner or edge will provide a source of eddies, because some corner is not sufficiently...

questions8938, welcome to PF. You say they will jump, then you ask "how high"? Don't give up. It will depend on the type of sheep...

Yes. If there is a difference in the two circuit currents that pass through the RCD, then it will trip.

How do you tell the difference between a stoat and a weasel? 1. You can weaselly tell the difference, because the stoat is stoatally...

A stoatal disaster that could weaselly have been prevented.

In an RCD, the circuit wires pass the same way through a transformer core. If the currents are equal and opposite, their magnetic fields...

Yes it will trip.