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# Tutor profile: Sagnik D.

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Sagnik D.
A tutor by passion
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## Questions

### Subject:Physics

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Question:

What is Temperature?

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Sagnik D.

Temperature is the measure of how hot an object is....but what does that really mean? All atoms have kinetic (movement) energy because all atoms move(vibrate). Even the atoms in a solid vibrate around a fixed spot. How hot an object is reflects the amount of kinetic energy in its molecules. You cool an object down by removing some of this kinetic energy. Eventually, you will get to a point where the atoms are not moving at all - this is the lowest theoretical temperature and is called 'Absolute Zero.' This theoretical temperature stands at 0K, or -273.15°C (-459.67°F). Units: SI: K (kelvin) CGS: degree Centigrade FPS: degree Fahrenheit

### Subject:C Programming

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Question:

What is function of 'printf' in C.

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Sagnik D.

It is a standard library function in for DOS based C compiler. Use: It is used to display some text or value of variable on the screen Format: printf("%d",x) ...for printing the value of x printf("I love C")...for displaying 'I love C'

### Subject:Basic Math

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Question:

What is the sum of first n natural numbers?

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Sagnik D.

Let S be the required sum S=1+ 2 +...+n S=n+(n-1)+...+1 _____________ 2S=(n+1)+(n+1)+...+(n+1) n times =n*(n+1) S=n*(n+1)/2

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