Recent content by BioBabe91

It is in the photoelectric effect section of the book, though. Alright, thanks.

Homework Statement Calculate the wavelength of a photon having the same momentum as an electron moving at 1.0  106 m/s. The answer is supposed to be 0.73 nm. Homework Equations Ek = (m*v^2)/2 Ek = hf - W p = E/c = hf/c = h/\lambda The Attempt at a Solution I first found Ek using...

Homework Statement if vectors \vec{a} and \vec{b} have opposite directions, how to show that |\vec{a}| + |\vec{b}| = |\vec{a} - \vec{b}|?Homework Equations quadratic equation, definition of absolute valueThe Attempt at a Solution |\vec{a}-\vec{b}| =...

Homework Statement Forces of 5N, 7N, and 8N are applied to an object, calculate the angle between the lines of action of the 5N and 7N forces. Homework Equations Sin, cos, and tan relationships The Attempt at a Solution I know that you have to use components, but I don't see how to...

Homework Statement Find the derivative of p = 2log3(5s)-log3(4s) Homework Equations for y=logb(g(x)), y'=g'(x)/(g(x)ln b) for f(x)=bg(x), f'(x)=bg(x)ln b(g'(x)) The Attempt at a Solution I got to the following: p' = 2*\frac{5^{s}ln5}{5^{s}ln3}-\frac{4^{s}ln 4}{4^{s}ln 3} EDIT...

That definitely worked! Thanks :)

wait... yes, sorry. i did copy the wrong one. so the answer for this one is \frac{2\left(x+2\right)^{2}\left(x-1\left)}{x^{2}}. But I'm still not getting the answer...

I did what Mark44 said, then I used the chain rule and the product rule. This is how I did it: But what do I do next? Do I have to do all the multiplication to bring everything under a single denominator? Because I don't seem to be getting the right answer that way... did I do everything...

Homework Statement Differentiate y = \left(\frac{x+2}{\sqrt[3]{x}}\right)3 Homework Equations -Chain Rule -Quotient Rule -Power Rule -Product Rule? The Attempt at a Solution First I got rid of the fraction by taking the negative of x^3, and then used the chain rule to differentiate...

Ooh that makes sense now... so the initial concentration is halved AND the equilibrium shifts. Would have never figured that out. Thanks.

Homework Statement For the equilibrium PCl5 <---> PCl3 + Cl2, all gases, Keq = 4.16e-2. The equilibrium concentration of PCl5 is 1.0 M, and both PCl3 and Cl2 are 0.204 M. If the volume of this closed system is doubled, what are the concentrations of each gas when a new equilibrium is reached...

That's true. But in what cases would cosφ not be equal to 0, for future questions like this? Thanks.

Homework Statement A skier of mass 55.0 kg slides down a slope 11.7 m long, inclined at an angle θ to the horizontal. The magnitude of kinetic friction is 41.5 N. The skier's initial speed is 65.7 cm/s (0.657 m/s) and the speed at the bottom of the slope is 7.19 m/s. Determine the angle θ from...