# Recent content by RabbitWho

1. ### I Odds ratio and percentages... absolute beginner

The fact that a number can increase in size in this self-referential way is neat. You number people and the things you do.
2. ### I Odds ratio and percentages... absolute beginner

Oh wait wait wait.. So the way odds ratio differs from percentage is that it is ALWAYS in reference to something else? Is that it? So 1 is ALWAYS the same as the thing its in reference to, and anything above 1 tells you how much it has changed... So if the GAD odds ratio for people with MD...
3. ### I Odds ratio and percentages... absolute beginner

Imagine that the chances in the USA of adult men having GAD are on average 1 in 100. But what of the subset of adult men who already have MD? What are the chances that such men will have GAD as well as MD? An odds ratio tells us about the increase in the chance that such men will have GAD...
4. ### Finding the force of repulsion between two point charges

Homework Statement [/B] Find the force of repulsion between two point charges of +1C and +3C if they are placed 1 m apart in a vacuum. On which charge is the greater force? ε=8.9x10-12 π = 3.14 d = 100 cm q1 = 1 q2 = 3 Homework Equations F= 1/4πε0 Q1 Q2/d2 The Attempt at a Solution The...
5. ### Finding the force of repulsion between two point charges

cool Ah! Sorry, this was a big mistake. I was looking at the sample method, where they were using microunits This is confusstipating because in the sample the book has an example with 50 cm and uses 50 as d in the sample method, not 0.5.. But ok! cool :) Ah yes thank you. Was confusing...
6. ### Suggestion Floating menu bar

I don't have to read the icons so they are the smallest size possible. I don't know how to do that. It was just a suggestion, forget about it. I really don't think the menu has any purpose other than to take up space, if I wanted any of those functions I could scroll up to them. But obviously I...
7. ### Suggestion Floating menu bar

I need to be able to see what I a reading, which I can't if I zoom out.
8. ### Suggestion Floating menu bar

What is the purpose of that floating menu bar on top, it is quite cumbersome for me on my small screen with its big writing. You know in the 90s there were frames on every website and we got rid of them because they were universally hated. Now that we all have wide-screen computers and...
9. ### Finding the force of repulsion between two point charges

Hello! So this is going into physics because it is a physics problem, but it is maths that is the real problem. So if you came here to help someone with physics and not maths I'm sorry. 1. Homework Statement Find the force of repulsion between two point charges of +1C and +3C if they are...
10. ### B Vocabulary: What do you call spinning on the opposite axis?

So imagine you have two disks, and from your perspective one is spinning on its vertical axis and the other one is spinning on its horizontal axis. What do you call that? And what would it mean to "spin at the opposite polarity" if such a sentence makes any sense at all? Thank you! Sorry if...
11. ### Find the mass of a metal block with heat capacity 60JK

ah I get it! I have to divide a million by 600, and I understand why, too. Thank you! :)
12. ### Find the mass of a metal block with heat capacity 60JK

OK so 600JK -1 (600 joules per kilo per Kelvin) is necessary to change the temperature by ` 1 MJ of heat is lost... Is that 1 megajoules ? so that is 1 million joules? The answer at the back says that the change in temperature is 1667 degrees Celsius.. I am sorry I can't see how to get that...
13. ### Find the mass of a metal block with heat capacity 60JK

Homework Statement A metal block of heat capacity 60 J K -1 loses 1MJ of heat energy to its surroundings. Find the decrease in its temperature. Homework Equations Q = m c Δ θ Heat energy added = mass x specific heat capacity x rise in temperature heat energy lost = blah blah blah x drop in...
14. ### Finding the angle of refraction

Ah! Thank you, that was a silly mistake. Let me see if I can do it now 0.413 = dNa Sin 20 degrees = 0.3420 sin r [sin theta diamond] / 0.3420 = 0.413 I think I am still going wrong somewhere because I can't see how to get 55.9 degrees out of what I have o.O Sorry about this
15. ### Finding the angle of refraction

it has to be and, doesn't it? Because all it says is "the refractive index", and the normal one to give is light travelling from air (or a vacuum) into the medium.