Monthly Archive: July 2011

Jul 31

A few problems from Current electricity

1. A carbon resistor of 47 k ohms is to be marked in the colour code . Write the sequence of colours .

2. A toaster produces more heat than a light bulb when connected in parallel to the 220 V mains

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Jul 29

Big Bang Theory

‘BIG BANG’ theory is well known to all . If it actually happened, Then I thought a question about this, like as what is the actual position of our earth in the previous time of ‘BIG BANG’?? When the whole earth is like a point. … Arkajyoti asked Incoming search terms:big bang theorytheory related in [...]

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Jul 28

A Numerical from kinematics

when a obj. crosses a 5m mark below the top of a building….a 2nd object is released at tat time which is 25m below the top…n den they reach the ground simultaneously…wat is the height of the building??????

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Permanent link to this article: http://www.plustwophysics.com/a-numerical-from-kinematics/

Jul 28

Numerical Problems based on Newton’s Laws

1.A machine gun has a mass of 20 kg. it fires 30g bullets at the rate of 400 bullets per second with a speed of 400 m/s. what force must be applied to the gun to keep it in position? 2.A ball

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Jul 28

A Question on Evaporation

Arunabh Arun sent this problem. (Click on the image to see the enlarged version.)

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Jul 27

Google Guru – A Great Help on the move

Have you heard of Google guru? Users of Google Talk can now get answers to their questions by adding g...@googlelabs.com as their friend on Google talk. After adding as friend, you can just chat with guru and ask any question on chat. The answers will appear as reply almost instantly. If you type Weather Trivandrum, a brief report on Trivandrum’s [...]

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Jul 27

Is the equation for displacement in the n th second dimensionally correct?

Is the equation for displacement in the n th second dimensionally correct?

S = u + a (n- 1/2)

Answer:

Yes

See the explanation given by Vimal Raj

If we notice the derivation of this formula let t1=x

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