Recent content by eureka_beyond

I should have put it clearer in the first place. The actual form (x2-5x+12)(x2-5x-2) is not given.

I don't get it =[, sorry but can you explain a bit more, I'm really bad at this topic. Thankyou so much !

if I don't put the -48 inside, then the answer won't be (x2-5x+12)(x2-5x-2), which is the answer to the question. So yes, I do need to put the -48 inside.

Homework Statement how do I factorize (x-1)(x-2)(x-3)(x-4) -48 into (x2-5x+12)(x2-5x-2) Homework Equations no relevant equations The Attempt at a Solution I've found the value of (x-1)(x-4) and the value of (x-2)(x-3) first. which is (x2-5x+4) abd (x2-5x+6), I put them together and...

oh right! so that's where 4 comes from. thanks. okay, so this means that charges do share equally between identical spheres. Do charges share eqally if they're not identical?

Homework Statement here's how the question goes: the magnitudes of the charges on two identical small metal spheres are in the ratio 5:1. the coulomb interaction force between them is F1. if they are brought into contact and then separated to their respective original positions, the coulomb...

Homework Statement why should experiemnts related to static charges be carried out on dry days? Homework Equations I know this somehow relates to the moisture in air. yet, I do not understand the concept behind. The Attempt at a Solution Do the sparks...

Ah~ I better correct the answer in my exercise book. Now I get it why a) is incorrect and why b) is correct. But I'm still having few concerns with c). After disturbance, the particles return to their original position, so there's no net displacement. c) saids there is. So i guess c) must be...

Homework Statement This is a general concept question. The problem is, I don't seem to understand what the question is saying and why. Here's the question: A mechanical wave can propagate through a medium if a) there are attraction/ repulsion between...

Homework Statement These two questions are very similar: 1) Let c be a constant. If a and b are the roots of the equation x^2 + 2x - c = 0 then 2b-a^2 = ? 2) Let k be a constant. If a and b are the roots of the equation x^2 - 3x + k = 0 Then a^2 + 3b = ? Homework Equations...

using 2as=v2-u2, I know s=(v2)/20. using s=1/2at2, t=v/10...using v=u+at, I got v=v?? I don't get it...

Should I apply v2-u2=2as ? Then I'll know how high does the particle reach, which is v2/20, but how will that help me with the question? Or am I using the wrong equation?

Homework Statement A particle of mass m is thrown vertically upwards with initial speed v. When the particle returns to it starting point, what are the changes in momentum and kinetic energy of the particle. Homework Equations P=mv KE=1/2mv2 The Attempt at a Solution...

Homework Statement the question goes like this a man of mass 70kg falls onto a rescue cushion from a height of 7 m he comes to rest 0.2s after he reaches the cushion the cushion is 2m high when inflated a)find the impact force acting on him (take the weight of the man into...

ah, I see. The book must have been using the second way you describe, I get it now, thanks a lot.