Recent content by AaronKnight

Can someone please explain what neutrino mixing angles are and how they relate to neutrino mass.

In the relevant equations sections ϕ=-Gdm/R should be dϕ=-Gdm/R

Homework Statement Show that the gravitational field due to a horizontal uniform thin disc (thickness D, radius R and density r) at a distance h vertically above the centre of the disc has magnitude 2πGρd(1-h/(R2+h2)1/2) A pendulum clock in the centre of a large room is observed to keep...

Thank you, I think I have managed to solve it now.

Homework Statement A uniform solid sphere of mass m and radius a has moment of inertia 2/5ma2 about any diameter. Material is removed from the sphere to make a concentric spherical cavity of radius a/2. What is the mass of the resulting hollow ball ? Show that its moment of inertia about a...

Thank you, it was the last step of writing r2 in terms of the mass and density that I was missing out.

Homework Statement A raindrop is falling through a cloud, collecting water as it falls. If the raindrop has mass m and velocity v, show that mg = vdm/dt +mdv/dt. Assume that the drop remains spherical and that the rate of accretion is proportional to the cross-sectional area of the drop...

Is it possible to find out how much the universe grew by during the period of inflation after the big bang?

Due to the universe being 13.7 billion years old means that we can only see light that has taken that long to reach us. Could matter-antimatter annihilations occur further away than that so the gamma radiation hasnt reach us yet to detect?

Is it possible that a far off galaxies that we are unable to reach are made up of anti-matter? How do we know that they are made up of matter?