Homework Statement
Two questions here, but it's mainly terminology I don't understand;
1(a). Calculate the proper motion of the Galactic Centre (GC) with respect
to the sun (and measured relative to the ‘stationary’ distant galaxies
and quasars) in units of arcsec/yr, assuming that the...
Homework Statement
I=\frac{p_{ave}}{4\pi r^{2}} is derived on the assumption that the transmitting medium does not absorb energy. It is known that the absorption of sound in dry results in a decrease in energy of about 8 dB/km. The intensity of sound at a distance of 120 m from a jet engine is...
Homework Statement
The motion of short wavelength (about 1 cm or less) ripples on water is controlled by the surface tension S. The phase velocity of such ripples is given by;
V_{p}^{2}=2\pi S/\rho \lambda
where ρ is the water density, and λ is the wavelength.
(a) Which of the formulae is...
So, we're playing snooker...
Homework Statement
A (uniform) snooker ball of radius r, at rest on a table, is struck by a cue at a point a distance h above the table. Assume the cue tip is traveling horizontally, in a plane through the centre of the ball. As a result, the ball begins to move...