can you perform work against the centrifugal force? what about the Coriolis-force?

CQW wishes our readers a Merry Xmas and a happy New Year 2015, and we hope to welcome you back on the 14.Jan.2015. if you want to contribute to CQW, please drop us a mail at cosmologyquestionoftheweek["AT"]gmail["DOT"]com.

# cosmology question of the week

CQW is an educational resource for theoretical astrophysics and cosmology. we post a new question every week for students to get and for teachers to stay in shape.

## Wednesday, December 17, 2014

## Wednesday, December 10, 2014

### Eddington-limit for muons

the Eddington-limit is defined as the luminosity where gravity is balanced by radiation pressure. imagine now that an astrophysical object contains muons instead of electrons: would the Eddington-limit be higher or lower?

## Wednesday, December 3, 2014

### cosmic neutrinos in ICECUBE

CQW celebrates its third anniversary!

could you estimate how long one would need to wait for detecting a neutrino of the cosmic neutrino background in ICECUBE?

could you estimate how long one would need to wait for detecting a neutrino of the cosmic neutrino background in ICECUBE?

## Wednesday, November 26, 2014

### tidal stretching of Palomar 5

the globular cluster Palomar 5 orbits the Milky Way and is stretched by tidal forces. on what time-scale would the tidal arms reach all around the Milky Way?

## Wednesday, November 19, 2014

### a quantum of sunshine

the Planck-spectrum is dominated by Boltzmann-statistics at high energies and by Bose-statistics at low energies. could you estimate how much solar power we receive per unit area at Earth from the quantum-mechanical part of the Sun's spectrum?

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