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^ do u use rotate the region bounded by y=1 and y=sinx ?

i did V = integration of 2(pi)xy from x=0 to x=(pi)/2= 2(pi)xsinx how did u get 1 - sinx?

Can someone please tell me what they get as the answer for this question. Find the volume of the solid of revolution when the arc of the curve y=sinx from x=0 to x=pi/2 is rotated about y-axis. The answer says its (pi)^3/4 - 2pi but I keep getting 2pi Thanks

Thanks so much someth1ng and nightweaver066

i used to use crosses and dots but my teacher said u lose a mark cos it asks for an electron DOT structure; the same is said in Conquering Chemistry. If you only use dots you will not lose a mark right?

Hey guys, When drawing the lewis electron dot structure for Ozone should we use different colours for each O atom to show that one oxygen atom supplies both electrons in the coordinate bond

But thats so easy. Its obviously x^3/3 + c :p

re: HSC Physics Marathon Archive ^Would it be better to give a quantitiative comparison - i,e the 'magnetic force' is x times greater than the gravitational force

oh shoot did 5! by mistake. Lol and i forgot to account for the fact that the dice can be rotated to give the same pattern :(

so the dice has the numbers 1,2,3,4,5 and 6 now we have to colour each number in a different colour (from 6 available colours) so you can paint the first number in 6 ways you can paint the second numbber in 5 ways can choose 4 colours to paint the 3rd number from this the total number of...

Too get the other inequality use discriminant properties and your knowledge of real and unreal roots (i.e. what is the definite condition for there to be real roots)

WOW we still have half of polynomials, and all of integration, mechanics, volumes, harder 3U left but i think my school finishes the course in the last 2 wks of term 3 (after trials i think- not too sure

Thanks for the reply :) I knew u dont need to write the charge but i was wondering if the new atom was charged or not.

If a radioisotope undergoes alpha decay does the new atom formed have a charge of 2-? For example: 222-Rn (atomic number 86) ----> 218 Po (atomic number 84) + 4He(2) Since radioactive radon atom is neutral and the alpha particle has +2 charge then should the Po atom have -2 charge. Similarly...

M1 Expand and collect like terms on both sides M2 let a,b and c be the roots of the cubic eqn fx^3 + gx^2 + hx + j = 0 LHS = sum of roots x sum doubles - product = - (gh/f^2 + j/f) SINCE a+b+ c = -g/f therefore a+b = -g/f -c RHS = (-g/f -a)(-g/f -b)(-g/f - c) = - (g/f+a)(g/f+ b)( g/f + c)...

Fahrout ur stupid sig. Planino : "You're so messed up cos your mum did your dad" HAHAHHAAHAHA WHAT AN IDIOT

Remove your sig or modify it LOL How was maths? Did u get any wrong yet?

When you don't know what a word means it may help to break it up. For example diction : dic shan No worries mate

ummm...i dont think thats required for hsc. I typed it on wolfram alpha and the answer was root(pi)erfi(x)/2 apparently erfi is some imaginary function??? where did u get this question?

Lol you said 'for biology, chemistry, physics I scored 98% for all three due to single mistake. still not happy. for maths ext 1 I got 95% and maths ext 2 I got 100%. so easy= Understand the concepts well before moving on to questions. English scored 93, 96, 100 for all three assignments. You...