YEAH!It's been an interesting week. Back at uni, waking up at a respectable time. My timetable is actually quite good though. No really long days. And so far my classes have been interesting so that'll keep me awake too. There has been an area of my thoughts in the past few weeks which I have endeavoured to keep out of my blog, appart from the subtle things between the lines as per usual. But I just want to say that I have been feeling quite happy with myself and actually smiling a whole lot more than usual. Hopefully one day I'll elaborate on this, though I'm sure most of you know by now since word travels faster around here than an ethiopean with a cheeseburger. :P
Perhaps in a fortnight I'll be able to say something here. Who knows. Here's to hoping.
I've got interesting homework for theoretical (physics) in which we have to estimate the answer to strange questions without actually looking things up. These questions are known as
Fermi Questions.
Some examples include:
What frequency of radiation is used in TV transmission?
How long would it take a solar sail powered spaceship to travel to mars?
How long does it take a deceased human body to reach room temperature?
How large a moon can you jump off of?
According to my calculations the largest moon which you could jump off of has a radius of 4.5 kilometers. Any larger than that and the gravity would hold you on, even though very loosely. Perhaps a 5km radius you could jump 3km off of the surface but would eventually sail back to it instead of floating off into space. This is of course based on several assumptions. That the highest I can jump on earth is moving my centre of mass up by about 60cm. That a typical moon is made of similar rocks to what we have here which have a density of about 3 times that of water so 3000kg per cubic metre.
Hmm I'm going to look up to see if anybody
real has done this calculation before to see how realistic my guess was? :)
Ok, seems like they havent. Or haven't put it anywhere easy to find from google.
I'm really curious how to estimate the TV one. I gather it's possible based on how much information needs to be transmitted to a tv for the picture to be clear but i'm not entirely sure how much, and how much can be sent by different frequency of radio waves.