If you need any help in Physics or Mathematics

Page

Next Last

akhl

@akhl

Dazzler

Posted: 17 years ago

Hi to all of my friends at IF😊

If you need any help in Physics or Mathematics, e.g, if you want to understand some concept, want help in solving any problem or any other kind of help, then let me know.
There is a web site specifically for this purpose. It is completely free to use. I frequently answer questions posted in that site. That site is not at all in competition with IF. So, I hope it is OK if I put the URL here. But, I will wait for green signals from mods.

Quote

Frequent Posters

@gk_09

Alumni

+ 6

Posted: 17 years ago

Akhl, if you can PM me the site and Ill let you know.

Quote

Looks like you are new here. Register for free, learn and contribute.

shivani

@Miss.Colorfull

Rocker

+ 2

Posted: 17 years ago

how is physics like is it hard n do u need to be gud at math to take physics in high skool cuz i am thinking about taking physics or chemistry

Quote

akhl

@akhl

Dazzler

Posted: 17 years ago

Physics is a very very interesting subject. It has always been my most favourite subject. Some students find it difficult because they try to memorize formulas without understanding the concepts. If you pay attention in understanding the concepts, then you will find it very easy and very interesting. You should be good in Maths to be good in solving numericals in Physics and also in deriving formulas.

You can contact me for any help in Physics or Mathematics.

Quote

Neha

@Neha-KSGian

Voyager

Posted: 17 years ago

Akhl, if you can PM me the site

Quote

Sehar Sheikh

@Sehar_Sheikh

Dazzler

Posted: 17 years ago

i hate physics. I dont understand a word of it...i think its coz of the teacher who teachs us...i dont understand even a single wrd of him....

Quote

Burns n Trolls

@shahsb_26

Stunner

+ 9

Posted: 17 years ago

I don't have physics as my subject but maths i dooo.... so but would like to know the site can u please gimme the link?

Quote

ask me

@laney

Dazzler

Posted: 17 years ago

ok I have got a maths problem! Please can you explain it to me how to solve it, our teacher wont explain it to me because I am doing my As and he says I should be knowing this! lol I knew it when I did my gcse but know I just cant remember the technique!

Question:

There are 12 steps. I descend one step at a time or two at a time. In how many different ways can I come downstairs?

--------------------------------

I think it is either 20 or 26? Please help me out!

thanks in advance

Quote

akhl

@akhl

Dazzler

Posted: 17 years ago

Problem: There are 12 steps. I descend one step at a time or two at a time. In how many different ways can I come downstairs?

Solution:

Let f(n) = no of ways in which n steps can be descended.

One step can be descended in only one way - descend that step.

Therefore, f(1) = 1

Two steps can be descended in two ways - one way is to descend one step at a time and another way is to descend both steps at once.

Therefore, f(2) = 2

If you have to descend n steps, then you can choose any of the following two options

1. Descend one step. After that you have to descend n - 1 steps.

2. Descend two steps at once. After that you have to descend n - 2 steps.

Therefore, no. of ways to descend n steps = no. of ways to descend n - 1 steps + no. of ways to descend n - 2 steps.

Or,

f(n) = f(n - 1) + f(n-2)

If we write the sequence of the values of f(n), then we get a sequence in which first term = 1 because f(1) = 1, second term = 2 because f(2) = 2 and after that each term is the sum of previous 2 terms. (Note: In case you are interested, it is Fibonacci sequence .)

There are 12 steps. Therefore, write the sequence for 12 terms.

f(1) = 1

f(2) = 2

f(3) = f(1) + f(2) = 1+2 = 3

f(4) = f(2)+f(3) = 2+3 = 5

f(5) = f(3)+f(4) = 3+5 = 8

f(6) = f(4) + f(5) = 5+8 = 13

f(7) = f(5) + f(6) = 8+13 = 21

f(8) = f(6) + f(7) = 13 + 21 = 34

f(9) = f(7) + f(8) = 21+34 = 55

f(10) = f(8) + f(9) = 34+55 = 89

f(11) = f(9) + f(10) = 55+89 = 144