Recent content by hhm28

Do you mean that since I represent glass with plastics, so I have to add a plastic to the tint layer to model the real life situation?

Is glass that important in this experiment? I don't have enough resources to run this experiment if glass is needed, I just wanted to prove that darker tint will give a better heat reduction. Anything suggestion to make the difference more significant or should I just move on and change my topic?

Homework Statement Here's the question for my coursework. "Everyone knows the feeling of getting into a car that has been under the hot sun.Nobody likes it. Design an experiment and investigate the factor(s) that contribute to this condition." Here's my question, 1)Do window tint really helps...

Okay. I will provide more details. The positive sine graph of displacement-distance graph has amplitude of 3 and wavelength of 4 meter while frequency is 2.5 Hz. Therefore, the displacement against t for particle at O given by book is y=3 sin (5ωt). For your doubt, I assume that when t=0 and...

Homework Statement A wave moving in the positive Ox-direction has displacement of particle of 0 at the origin, O at time = 0.The displacement-distance graph showed a positive sine graph. Write an expression for the variation of the displacement y with time t for the particle at O...

Thank you so much anywhere. =)

Gosh. I never learned that =(

means that A/r(r+1) + B/(r+2) to get partial?

∑1/r(r+1)(r+2) = ∑1/2r - 1/(r+1) + 1/2(r+2) How do i continue? the 1/(r+1) is disrupting. =(

1/r(r+1) = (1/r) - (1/r+1) ∑ 1/r(r+1) = ∑ (1/r) - (1/r+1) = -∑ [(1/r+1) -(1/r)] Let f(r)= 1/ r+1 , f(r-1)= 1/r ∑ 1/r(r+1) = -∑ f(r) - f(r-1) = - [f(n) - f(0)] = - [(1/n+1) - 1] = n/n+1

LOL. Thats the problem. I only know how to solve f(r) - f(r-1). Now there is 3 partial fractions. But with 2/(r+1)(r+2) - 1/r(r+1)(r+2), i managed to get ∑ -[(2/r+2) - (3/r+1) + (1/2r+2) + (1/2r)].

This did help me. But the problem is i stucked somewhere. I got sigma -[(2/r+2) - (3/r+1) + (1/2r+2) + (1/2r)] and I stucked. I should've make it into f(r)-f(r-1). =( I'm stupid Argh... Can you show me how? Perhaps upload a photo. LOL

Homework Statement Here's my question. My school recently taught me finding summation using method of difference and what my teacher taught was just involving 2 partial fractions. But this question appeared in my exercise given by my teacher. r th term: (2r-1)/r(r+1)(r+2). Find summation...