Home > Physics > Classical Mechanics: Lecture 35 Notes

Classical Mechanics: Lecture 35 Notes

Overview

Last lecture!  It’s essentially 44 minutes of Lewin talking about his old research.  Walter definitely has a gesture with his right hand stroking his hair and cupping his mouth.  He may have a tremor in the right hand, which manifests itself sometimes.

Details

X ray astronomy needs to be done near the top of the energy.

Power x rays/Power visible = 10^-7

Very little of the solar output is in the form of x ray radiation.

Px/P opt = 1000

…from a particular star.  What is this object?

Rockets would be launched from White Sands, NM and fly for 5 minutes, scanning for x rays.

Balloons would go up to 140,000 feet.  The balloons were 500 feet across.  Inflate in the morning or the late evening.

50 million cubic feet was the largest balloon.  It was also 600 feet across.

X rays fluctuate for 2.3 minutes, the rotation period of a neutron star.

mMG/R = .5 m v2

10 million degrees, the spectrum shifts to being focused on x rays.

MIT used to have its own satellite, SAS1, in 1976.

3He4 = C12 + hv

This reaction happens when helium hits the surface of a neutron star.

Lots of interesting stuff today, a round-about manner of learning physics.

Review

PE = U = mgh

PV = nRT

PV = NkT

KE = K = .5 mv2

P = mv

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