Archive for September 25, 2012

Lay your sleeping head, my love..

Posted in Poetry with tags , on September 25, 2012 by telescoper

Lay your sleeping head, my love,
Human on my faithless arm;
Time and fevers burn away
Individual beauty from
Thoughtful children, and the grave
Proves the child ephemeral:
But in my arms till break of day
Let the living creature lie,
Mortal, guilty, but to me
The entirely beautiful.

Soul and body have no bounds:
To lovers as they lie upon
Her tolerant enchanted slope
In their ordinary swoon,
Grave the vision Venus sends
Of supernatural sympathy,
Universal love and hope;
While an abstract insight wakes
Among the glaciers and the rocks
The hermit’s sensual ecstasy.

Certainty, fidelity
On the stroke of midnight pass
Like vibrations of a bell,
And fashionable madmen raise
Their pedantic boring cry:
Every farthing of the cost,
All the dreaded cards foretell,
Shall be paid, but from this night
Not a whisper, not a thought,
Not a kiss nor look be lost.

Beauty, midnight, vision dies:
Let the winds of dawn that blow
Softly round your dreaming head
Such a day of sweetness show
Eye and knocking heart may bless,
Find the mortal world enough;
Noons of dryness see you fed
By the involuntary powers,
Nights of insult let you pass
Watched by every human love.

by W.H. Auden (1907-1973)


A (Physics) Problem from the Past

Posted in Cute Problems, Education, The Universe and Stuff with tags , , , , , on September 25, 2012 by telescoper

I’ve been preparing material for my new 2nd year lecture course module The Physics of Fields and Flows, which starts next week. The idea of this is to put together some material on electromagnetism and fluid mechanics in a way that illustrates the connections between them as well as developing proficiency in the mathematics that underpins them, namely vector calculus. Anyway, in the course of putting together the notes and exercises it occurred to me to have a look at the stuff I was given when I was in the 2nd year at university, way back in 1983-4. When I opened the file I found this problem which caused me a great deal of trouble when I tried to do it all those years ago. It’s from an old Cambridge Part IB Advanced Physics paper. See what you can make of it..

(You can click on the image to make it larger…)