Recent content by whiteman

Homework Statement Nine students A, B,..., I serve as members on eight committees, as follows. Committee 1: A, B, C, D Committee 2: A, C, D, E Committee 3: B, D, F, G Committee 4: C, F, G, H Committee 5: A, H Committee 6: H, I Committee 7: G, H Committee 8: E, I Each committee is to meet...

thanks for all the help, guys, especially Dick. i was able to get it from the first post you gave :)

Homework Statement Let k be any positive integer. Prove that there exists a positive integer multiple n of k such that the only digits in n are 0s and 1s. (Use the pigeonhole principle.) Homework Equations The General Pigeonhole Principle If more than mk things are distributed into k...

i figured it out. i was using the wrong formula for diffraction. instead of m + 1/2, i should have been using m sin(theta) = m(lambda)/(d) instead of m+1/2

Homework Statement Light of wavelength 676 nm in vacuum is incident on a single slit whose width is 1.60 × 10-5 m. The setup is then immersed in water whose index of refraction is 1.33. What is the angle θ that locates the third dark fringe with respect to the central bright fringe?Homework...

Homework Statement Hi all, i have to identify 5 samples (1,2,3 were solids, 4,5 were liquids) by classifying them as 1) Aliphatic or aromatic and 2) Carboxylic acid, amine (primary, secondary, tertiary) or ammonium carboxylate We did a burn test on the solids, tested solubility in water...

Hi, thanks for the welcome. Is Ua and Ub meant to expressed in terms of cos/sin of A/B or are they just numbers? I got Ua = 3gcosB/4sin(A+B) and Ub = 3gcosA/2sin(A+B). Is this right or am I going wrong?

Homework Statement A ball was projected at an angle A to the horizontal. One second later another ball was projected from the same point at an angle B to the horizontal. One second after the second ball was released, the two balls collided. Find the speed of projection for the two balls...