James

Would the time dilation caused by the gravity from the black hole not be counteracted by the acceleration associated from orbit?

Well I was going through the following wiki page:

http://www.google.co.uk/url?url=http://en.wikipedi...

...and was completely stumped when it started integrating v w.r.t p to get KE. Shouldn't it be the other way round? I can't even follow what's happening in the equation. Could someone plz give me a quick talk through?

(You don't need to explain what integration by parts is lol).

I'm on my first year of a Physics course at York Uni, and and am finding myself increasingly drawn to the type of jobs that normally suit engineers, e.g. working at McLaren or BAE. I've heard companies are starting to turn to physicists more often these days because they have a different way of thinking, but it would be nice to hear some further opinions.

What's the incentive? I like McLaren because I'm British. People may support Ferrari because they've always liked their cars... but what's to like about red bull? Do you find their drink so inspirational that you've fallen in love with he company? Do you have an obsession with the colour purple? Or are you just a glory supporter? o.O

I was wondering if there is a difference in visual quality between playing a 1080p film on a 720p motor compared to a 720p film natively, (and perhaps also on 1280 x 800)

a) if they are the same size,

b) if they are the same bitrate per pixel.

Thanksssssh

The volume of gas in the cylinder slowly increases by a factor of three while it's pressure decreases from 9x10^5 to 10^5 Pa. How much work is done during the expansion?

A diagram shows that the volume increases from 1m^3 to 3m^3

Thanks

I know the answer, but not how to get it.

Thanks

Once I get cos^2 x = 0.04 I don't know what to do since the cosine is squared.

Thanks

Got a lovely one here for you:

Find the solution of the differential equation that satisfies the given condition, in simplified explicit form is possible -

x(dy/dx)+4=Y^2 When Y=3, x=1

The correct answer should be Y=2(5+x^4)/(5-x^4)

Thanks

They apparently use anodes to accelerate electrons, but it stands to reason that as soon as the electrons move past it, they will just be decelerated again... they're still attracted to it! Is the anode mainly for focusing while a cathode accelerates them, or does their speed mean once it's past the anode they are less affected by it? (due to relativity or something)

Thanks.

Thank youuu

Ok, A2 mechanics lesson, and we're doing kinetic and potential energy. In one question we found speed from energy. Lets say it was 2000N, & 2Kg, so v=44.7m/s. We were then told the particle was already moving at 5m/s, before the force was applied. I immediately added 5 to 44.7 to get 49.7m/s, but apparently you have to use 2000 + 0.5 x 2 x 5^2 = 0.5 x 2 x v^2 to get 51.2m/s. If you think about it, this way of thinking makes no sense when you think about the grand scheme of things - relative speeds in the universe etc. You could say the earth is moving at such a speed which would mean it would be much more difficult to reach the same speed traveling west than east... what's going on!

It's supposed to be impossible for someone to get electrocuted by touching power lines as long as they're not grounded, so how did hot hot air balloon manage it? Was it a discharge of static, or could it have been caused by touching two lines simultaneously?

I keep getting 2/3 but according to the mark scheme it's 1/3

Thanks

Given that y = (1+sinx)/cosx, show that dy/dx = 1/(1-sinx)

I tried the Quotient rule and ended up with (1+sinx)/(1-sin^2x) :-/

Thanks in advance

I understand the definition of Lenz's Law perfectly, but it simply doesn't make sense in my mind. The current seems to be induced in the complete wrong direction! It's like turning a water wheel so it should push the water in the river "upstream" (although lets say there isn't actually an existing flow of water downstream), but instead it gets accelerated downstream! You could also think of it like compressing a spring. If you push it, there IS a corresponding force in the opposite direction - that makes sense, and the water wheel would experience the same thing - but the spring still moves in the direction you pushed it. Could someone please give me a piece of mind and explain the reasoning to me!

Thank You.

I'd like to create a bootable dvd from it but I'm not sure if the app store will charge me since it isn't in my past purchases.

Thanks.