Recent content by agoogler

@Chestermiller That was a very beautiful answer , thanks a lot! I've 3 small doubts. First , just to clarify your first statement , you mean that if instead of friction i stop the block slowly using my hand (hand is thermally insulated) then the block won't get heated up? If that is so , is...

There is some ideal gas in a container moving with some velocity on a smooth surface and you suddenly stop it( say by using your hands) , will the temperature of the gas increase? It seems to me that since you're suddenly stopping it there is no work done (because of no displacement ) so the...

Further , isn't work done always equal to change in kinetic energy(by the work energy theorem) ? Or is that actually a subset of first law?

@Chestermiller Thank you for your answer. I'm having difficulty understanding why dU=0 . Consider that the block is stopped by friction. Then won't the block heat up when it stops and hence its internal energy as well as temperature should increase. In fact calculating the temperature increase...

I'm confused about what exactly is Q and U and their signs. Consider a block initially having some kinetic energy which we stop and we want to find by how much amount its temperature increases. Then Q=dU+W where dU is change in internal energy. (I'm using the sign convention that heat absorbed...

What are the rules for choosing main branch ? Wikipedia states - "Identification of the parent hydrocarbon chain. This chain must obey the following rules, in order of precedence: 1 It should have the maximum number of substituents of the suffix functional group. By suffix, it is meant that...

@DrClaude But if I'm just given a random acid how can I find the number of onizable hydrogen atoms?

Homework Statement What are the number of ionizable hydrogen atoms in phosphorus acid H3PO3? Homework Equations - The Attempt at a Solution I didn't even know what "ionizable " means. ( This is not a homework questions, I'm solving sample questions for an entrance exam) . So I searched the...

In my previous question , situated here, I asked about finding the equivalent resistance of the following circuit : I got some very good answers and some tips. Now what if the same circuit is modified by adding two more resistors on the free connecting wires like this : How...

Thanks everyone for answers. Do you have any tips for redrawing? When I get a complex circuit like this , how should I approach redrawing it? Is there any method ? Thank you

Actually this is from a book so I know that these resistors are in parallel but I'm more interested to know why i.e. the explanation.

I know how to detect when resistors are arranged in parallel or series arrangement and I can also find their equivalent resistance in simple circuits or when resistances are connected in form of triangle but what happens when the arrangement is complex like this : Which resistors are...

I don't understand. Using the reverse pole rule on that webpage I'm getting the answer as (A) , can you please explain why the answer is (B)? Edit: Got it.

Homework Statement Homework Equations - The Attempt at a Solution The relative velocity of magnet with respect to ring is 5−4=1m/s How can I find the Direction of induced current in conducting ring due to motion of bar magnet? I searched online and found this ...

I tried and got A as (5,7) . Is that right? Then I get C as (6,0) so AC2=50.