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If observers in an inertial reference frame in relative motion to rest frame observe time to be longer, then why is it that this time is reduced considerably for astronauts? isn't this contradictory... i don't understand

So basically I'm really confused about the definitions of conjugates cus of that. I understand that if OH- + H3O+ -> H20 + OH- the base/conjugate acid pair is OH-/H2O the acid/conjugate base pair is H3O+ and OH- BUUUUUUUT with NaOH how does NaOH + H3O+ -> H2O + Na+ + OH- how is Na+...

- sketch the locus of z if |z|<=1 and |(1-z)/(1+z)|<=sqrt3 now i understand the answers in saying -sqrt3<=tan(theta/2)<=sqrt3 and then sketching the angles from that But I just don't understand why you can't split the modulus and bring it to the other side so you get |(1-z)|<=sqrt3|1+z| which...

THE TITLE SAYS IT ALLLL. how do i find it?? PLEASE HELP. THANKS :)

HELP GUYS so if I want the shortest distance |w-z| where w is represented by the locus x^2 + (y-1)^2 =9 and z by the line 4x+3y-24=0 , how would I find the shortest distance?? the answer says it's 4.2, but they took the perp distance from the centre of the circle. I don't get how they can do...

OKAY SO IN ORDER TO OVERCOME heat loss to surroundings we ensure that the container has a high specific heat capacity because that means it won't absorb much heat. WHY???? . . . . . . . how does this impact how much heat it absorbs? doesn't it only impact temperature rise?

So there's so much on enthalpy in the textbooks but the word 'enthalpy' isn't mentioned once in the syllabus?????????? So is this 'enthalpy' something they expect us to learn?

QUESTION: - sketch the pattern of electric field lines around a hollow negatively charged sphere (show the field inside and outside it) ??? what does this mean by 'inside' it. There is no charge 'inside' the sphere right? and if there isn't, WHY??? (am I correct in thinking that because...

So I know that validity can be ensured/improved by controlling variables and having a control. Does accuracy of equipment impact validity (e.g. smaller gradations on a thermometer)? I know that accuracy can be improved by your choice of equipment but can validity be improved if you improve your...

So I understand that a line of best fit has to have approx half points above and below What about a curve of best fit? Do you need to plot it through as many points as possible, or just plot a general shape with half of the points above and half of the points below (approx)? Thank you!

OKAY SO WHAT'S THE DIFFERENCE GUYS. I KEEP USING THE SECOND ONE (DELTAH=-mCDELTAT) because it's in the syllabus, BUT THE MINUS ALWAYS THROWS THINGS OFF. i am beyond confused!!! thanks! (sorry for caps, was getting pretty aggravated..)

Hi guys! I'm unsure as to how to answer this dot-point. 2. Explain how water's ability to absorb heat is used to measure energy changes in chemical reactions I get that water is used in calorimeters but I can't seem to elaborate any further than that. And assessing the limitations of...

So this is the dot-point : explain why ammeters and voltmeters are connected differently in a circuit. I'm confused as to why a voltmeter is connected in parallel. Okay so I get that this enables it to measure potential difference. And because the resistance of the voltmeter is super large...

okay so I am aware that when f"(x)=0, it can be an inflexion point, max, min, anything really..... am I right? WHY THEN, IS F'(2)=F"(2)=0 A HORIZONTAL POINT OF INFLEXION? can't it also be a turning point? I AM SO CONFUSED. thank you :) !!

Ok so I understand that glass beads allow the liquids that semi-evaporate to condense (as they don't have enough energy to completely evaporate), but what really is the point? Can't the liquids just condense on , say the glass , and evaporate when there is enough energy? Thank you!!

THANKS (sorry if this is common sense guys )

okay so why is the differentiated graph of a quadratic linear? why can't it be cubic? (now this is assuming one does not need to actually differentiate the quadratic, but only estimate the gradients relative to each other to draw a sketch of the differentiated graph. is there even a way to...

Guys good textbooks for chemistry, physics and biology? Thanks

OK SO HOW DO I GRAPH |x|-|y|=1 |x-y|=1 ETCTETC explanations would be greatly appreciated :) THANK YOU!!

HOHOHO ANOTHER SUBJECT SELECTION THREAD. ok so I'm definitely doing (for year 11) -3 english -3 maths -chem and then it's either bio and phys, bio and mod or phys and mod. Now a few questions: 1. Should I take biology or physics? (I know biology is more memory whilst physics is...