I just want to talk about a few things. 1. W960! 2. A possible answer to the black hole question.
1. W960!
It's been 3 weeks since I got the phone, and therefore have had enough time to get used to it. It's basically a business phone with a touch screen, no D-pad, a little laggy, but great overall. Here's a picture:
Well, it has WLAN, which is a definite PLUS+. The touchscreen also allows me to get to places without much navigation. The walkman player is PRETTY(:
Well, basically I love it. My sister got W760 [chris' phone, yup!]. It's really nice too. It doesn't have WLAN, yea, but it does have a motion sensor! It's a very user-friendly phone. Mine really take some getting used to, but once you do, it does whatever you want. It's just that you can't drop it,unlike my G502, which will probably be the hardiest and best [overall] phone I will ever use in my life. It has all that you need on a phone on an everyday basis. You can drop it with no worries. It's just that mine had a software problem that couldn't be fixed, and the SE people couldn't do anything and wouldn't replace the set. Well, I was promised a new phone so I got W960. If I had a choice, I would choose Nokia 6120 over W960, but it wasn't available. Well, now it's my job to pester my dad to get that!
2. A possible answer to the black hole question.
I had a 2 hour long conversation with Sharne about this the other day. I definitely learnt something.
Here is an illustration to show how density and mass make a difference in warping space. I do not know how the density is represented in equations [I did not study Einstein's equations], but here it is in image. This is what Einstein said. If you have two drums, one being pierced by a needle and one being pressed with a ball, both with a force of 10N, you can see that the needle will make a bigger warp than the ball. So a more dense sphere will warp space more than a less dense ball.
Today, Gloria sent me a message telling me that she found something in the physics textbook [I have no idea how I missed this!].
There big sphere is the Sun, with its current size. It exhibits gravity X on object Y at distance Z from its CENTRE. But if the Sun shrunk to the size of the smaller sphere, the gravity between object Y at distance Z from the sphere's centre is still X! But when the object comes within the area that the large Sun once occupied, the warp on space is much more significant and this is the tremendous gravity of the black hole. The escape velocity increases as you get nearer and nearer to the sphere, until finally, it exceeds light speed. That's the event horizon of the black hole, beyond which NOTHING can escape. That's the dark part of the black hole, which is essentially, black.
Newton's F = Gmm/r^2 was an approximate equation, suitable for relatively low-gravity situations. But when it comes to strong gravitational fields, such as a black hole, relativity equations do much better. So although Newton's equation does not include density, perhaps that's why I got so confused. Einstein's equations are too confusing for me to analyse at this point.
So basically, it's just that density does play a part when you are within the area that the big star once occupied before its collapse into a black hole, that's when you feel its immense strength. But beyond that, it feels like it would have if it had never collapsed. Still, it's not possible not get crushed when you're so close to the star! Even if you were standing just outside the area that was once occupied by the star, it's still extremely strong because it's as though you're standing 1cm away from the star!
Well, I hope I gave you something to think about. Merry Christmas and Happy New Year!
JAYASHRI(:
GROUND RULE:
LOVE YOUR PHYSICS TEXTBOOK!
[Paul Hewitt, Conceptual Physics 10th Ed. Pearson International Edition.]
