Physics 260, Problem Set 3
due:
Tuesday, October 4 at Noon
Please place your completed problem sets in the “Physics 260” box in the physics department
mailroom (Rutherford 103b). You are encouraged to discuss these problems with your colleagues,
but you must write up your own solutions; the solutions you hand in should reﬂect your own work
and understanding. Late problem sets will be penalized 10% per day late, unless an extension has
been obtained from me or a TA
before
the due date.
Reading
: Chapters 2 and 3 of Bernstein et al.
1. Consider a disc which is spinning around its center with constant frequency. Let
R
and
ω
denote the radius of the disk and the angular frequency of rotation as measured by an
observer A who is sitting at rest at the origin of the disk.
(a) What is the circumference of the disk, as measured by this observer A? Does the ratio
of the circumference to the radius equal 2
π
? This means that the geometry is
non
Euclidean
.
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 Spring '10
 DavidHanna
 Physics, Energy, Special Relativity, Particle, rest energy Erest

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