## Search found 57 matches

- Sat Dec 24, 2016 3:14 pm
- Forum: Physics
- Topic: About a problem from the BdPhO '17 category A
- Replies:
**1** - Views:
**1534**

### Re: About a problem from the BdPhO '17 category A

You are right; the problem contains an error.

- Fri Dec 23, 2016 8:36 pm
- Forum: Physics
- Topic: Photon and Tennis Ball
- Replies:
**1** - Views:
**1297**

### Photon and Tennis Ball

Imagine you are sitting on a spaceship that is moving uniformly in a region of space where there is no gravity. You threw a tennis ball and a photon particle toward the roof of the spaceship. The ball is bouncing between the floor and the roof. The photon is bouncing between two mirrors – one on the...

- Fri Dec 23, 2016 4:00 am
- Forum: Number Theory
- Topic: Stuck! Pls help quick
- Replies:
**2** - Views:
**1572**

### Re: Stuck! Pls help quick

Where are you stuck? In this type of problem, it's convenient to start on GCD:

Let GCD be $g$ and the two numbers be $gx$ and $gy$, in which $x$ and $y$ are co-primes.

$gxy=7g$

$xy=7$

Think about what the values of $(x,y)$ could be.

Then you have just to solve

$gx+gy=392$

Let GCD be $g$ and the two numbers be $gx$ and $gy$, in which $x$ and $y$ are co-primes.

$gxy=7g$

$xy=7$

Think about what the values of $(x,y)$ could be.

Then you have just to solve

$gx+gy=392$

- Thu Apr 07, 2016 8:39 pm
- Forum: Combinatorics
- Topic: Combi-Spanish olympiad_1985
- Replies:
**2** - Views:
**1682**

### Re: Combi-Spanish olympiad_1985

Are you certain that

Consider

*n*is a real number, not an integer?*n*as a real number will make the problem uninteresting.Consider

*n*an integer, and apply the Method of Mathematical Induction (গাণিতিক আরোহ পদ্ধতি).- Tue Feb 16, 2016 3:19 pm
- Forum: Junior Level
- Topic: Exponents
- Replies:
**4** - Views:
**3499**

### Re: Exponents

It's essential to clarify all the

$(a, b)=(-2, 10), (-32, 2), (1048576, \frac{1}{2})$?

**constraints**of a problem precisely. Why should we not consider negative and fractional values for*a*and*b*for this problem? For example, what's wrong with$(a, b)=(-2, 10), (-32, 2), (1048576, \frac{1}{2})$?

- Mon Feb 01, 2016 3:17 pm
- Forum: National Math Olympiad (BdMO)
- Topic: Math Problem 1
- Replies:
**2** - Views:
**1796**

### Re: Math Problem 1

Your heuristic approach of solving the problem is commendable.

How about this approach: you assume the no. of students who scored less than 60 to be '

How about this approach: you assume the no. of students who scored less than 60 to be '

*x*' and then construct a simple algebraic equation?- Tue Dec 29, 2015 8:08 pm
- Forum: Physics
- Topic: Relation between acceleration and deformation
- Replies:
**1** - Views:
**1570**

### Re: Relation between acceleration and deformation

It's always progressive for mutual discussion if we share our line of thought with the questions we pose. Otherwise, merely asking questions may fail to elicit sufficient interest among the forum members. Now about your question, you did not specify the directions of the forces . Anyway, both forces...

- Mon Jan 26, 2015 4:09 pm
- Forum: Higher Secondary Level
- Topic: Where did the other root go?
- Replies:
**7** - Views:
**3270**

### Re: Where did the other root go?

It didn't go anywhere. You have made an error in the root extraction formula for the quadratic form of equations. Please check again.

- Sun Nov 09, 2014 10:46 am
- Forum: Physics
- Topic: Errors in Galileo’s Thought Experiment?
- Replies:
**2** - Views:
**2533**

### Re: Errors in Galileo’s Thought Experiment?

"The contradiction, that "it will fall faster (for total mass is heavier) and it will fall slower (for the resistance by light object)", ended the discussion that initial assumption, that one was falling faster than another, isn't correct. That deduces what we wanted." — No, the supposed contradicti...

- Sat Nov 08, 2014 1:51 pm
- Forum: Physics
- Topic: Errors in Galileo’s Thought Experiment?
- Replies:
**2** - Views:
**2533**

### Errors in Galileo’s Thought Experiment?

"বিজ্ঞানকে জানার তিনটি সুনির্দিষ্ট পথ রয়েছে, প্রথমটি হচ্ছে যুক্তি তর্ক। একটা উদাহরণ দেয়া যাক: একটা ভারী জিনিস আরেকটা হালকা জিনিস উপর থেকে ছেড়ে দিলে দুটো কি একসাথে পড়বে নাকি ভারীটা আগে পড়বে? এই প্রশ্নের উত্তর খুঁজে বের করার জন্য কিন্তু কোনো বৈজ্ঞানিক সূত্রেরও প্রয়োজন নেই কোনো জটিল পরীক্ষা-নিরীক...