daniton

there are couple of ways to come up with answer.Try conservation of energy.it's a bet easy and quick .if you are familiar with calculus you can begun from the beginning definition of acceleration, velocity , this kind of thing

but really what grade are you?

I don't understand!!!!!!!!!!

Could you be more specific.Giving definition may not help you depending on what you need to know.

 

You agree with what?

Actually i was with Delta1212 with his definition of single weighing.But I agree with your answer too.

check this "engineeringtoolbox.com/gas-mixture-properties-d_586.html" and work the rest,it can't get more simplified than this.

Good luck!

I agree

Place bag #1 onto the scales and if the scale reads 17 oz, you're done.

 

If you weren't lucky enough to get the 17 oz on the first try then use the same methodology a dieter uses when weighing portions by placing a small amount on the scale, never removing the food item but repeatedly adding to the amount on the scale until the desired weight is reached, thereby one continous weighing.

 

To apply this principle to find the 17oz weight try the following:

If the scale reads 16 oz, on bag #1, do not remove bag #1 but place Bag # 2 and the scales will read 32 oz if it's a 16 oz bag or 33 oz if it's the 17 oz bag.

Repeat this process, never removing any of the previous bags, realizing each new bag will increase the weight by an additional 16 oz unless the newly added bag is the 17oz.. bag. In doing so you have one continously increasing weight until the 17 oz bag is found.

 

I imagined it could be argued that this technique would be considered to be multiple weighings but I would think by never removing the bags previously added it could count as one weighing.

weighing?

why do you us Cp

since ethalpy =Internal energy + work done

There are 10bags each containing 10 weights,all of which look identical.In 9 of the bags each weight is 16 ounces,but in one of the bags the weights are actually 17 ounces each.How is it possible in a single weighing on an accurate weighing scale to determine which bag contains the 17-ounce weights?

what do you expect it is a ratio.and in the formula I give the first post correct T1V1 although it is clear.

what about the ethalpy change?

why do you say there is no heat transfer because W=0 that is not true work=0 means the whole heat is transferred to internal energy

the Change in ethalpy is equal to the Change in internal energy since work is zero.

I didn't get the carnot expansion thing in question but the ratio of volume for isotermal or adibatic process is just T1V2^()=T2V2^()

I don't want to tell you the power because it differ for the two and you should know it.

for more I think you should watch Professor Shanka's lecture on YouTube

so, what is your question?

what????

I still didn't get what you really want to know but as far as I understand I think you want to know if there any thing to say whether a gas is dissolved or not. what your teacher say about the bubble is that the co2 was there in the solution,the reason you see the bubble is the co2 skipping out from the solution due to pressure decrease as you move the bottle which increase the volume.

when I get to the question

you could check the PH may be color change or some other staff.

did I get you point?

What are the evidences that a gas is dissolved in water???

what do you mean by that? clarify it!!

thanks but the reason i post this question is because i need somthing that may help me for my exam in November from someone who knows the exam like a discussion...

and i don't know how i write "ostensibly" in the post

Is there any one who ostensibly familiar with CIE A level exam or who took one, need help!!!

I suggested you visit simple.wikipedia .org/ and you will find what you need I hope.

That couldn't be an answer? doppler effect is all about whether there is change in frequency due to the apparent movement of source or observer or both.

I just want sth how to look at the problem.

the point is since the velocity of sound is varying even though the distance between the source and the observer is unchanging I think there may be sth going on since the conditional is differnt from the classical way.

I try to imagine how the wavelength can change or not but can't follow it intuitively

Is there a change in frequency of sound for an observer at the center of a circle for a sound source moving in the circle?

1feet every second so at 27 second 27 ft at the next second it reachs the top.

what all the wired symbols,I can't understand.

let's try my way from , right to left I symbolize the tension and the mass as follows

m1 , t1 , m2 , t2 , m3

then follow me since the motion is to the right,

m1g - t1 = m1a .......(1)

t1 - t2 - ff = m2a ........(2)

t2 - m3g = m3g ........ (3)

solve this you will get what you need.