Recent content by fabbo

Thats really interesting - I always assumed it would be those galaxies closest to us that are most accurate to determine distance with. Can red-shift be used to determine how far away something is? What other methods are used?

I am currently studying the Hubble Constant as part of my high school physics course. I'm aware that inaccuracies in determining this constant are largely due to difficulties in measuring distance between galaxies. I really just wanted some information, or to be directed to some web sites that...

Well its not really a homework question but I have looked through the tutorials and am still at a loss. Homework Statement During weak interactions the particle exchanged is either W- W+ or Z0. The thing is, I get confused which weak interactions involve W- and which involve W+. I know...

I find it really hard to write half equations from the given redox reaction. I'm ok when H+ and water are not involved but when they are I get stuck. Eg. for this reaction: IO3- + 5I- + 6H+ ----------> 3I2 + 3H2O How would you go about splitting it up as I features as a reactant twice?

a bit confused :s

do you use the natural frequency of the spring or look at the time period and root mass?

The problems with space... Just pondering how you would measure an object's density when in space or a vacuum... Was thinking attach it to a spring and use the spring constant but would a spring work in an area with a low gravitational field strength? What are other people's ideas?

sorry to be a pain but if there's anyone who can help with this question it would be great

I've completed this question and have an answer but I am unsure if my method is correct. The question reads: A space exploration mission has discovered a new planet with a single moon. The distance between the centres of the planet and its moon is found to be 250000km and the period of...

looking at a similar problem but a bit confused on how webren gets Tsinθ = m (v^2/r) ?

there's no other information - that's why I am confused. I asked my teacher and he said it is solve - able...

does anyone have any ideas?

The mass defect when an alpha particle formed is 0.03u. This is 27.945MeV and 1.75 x 10[SIZE="1"]26J. How can this be used to calculate the mass of the tritium formed?

Ok, I've been puzzling over this question - any thoughts? A possible fusion process has deuterium nuclei combining to form an unknown nucleus plus one excess neutron. Write out an equation for this process. Identify the unknown nucleus. Use the following data to determine why deuterium is...

does this mean the change is 0.8 - - 1 giving 1.8kg/m/s?