Recent content by greenglasses

Homework Statement [/B] Your niece finds her father's watch. The light watch chain has a length of 48 cm, and the mass of the watch is 270 g. Your niece swings the watch in a vertical circle, maintaining the speed of the watch at 2.3 m/s. Find the tension in the chain when it makes an angle of...

Homework Statement A massless spring with a spring constant k = 500 N/m is suspended from a hook on the ceiling of a cargo truck moving in a straight line (horizontally) on the highway. A child reaches over from her seat and suspends a 1.1 kg toy on the free end of the spring. The child...

I have to write a research paper on a mathematical topic for my class; I chose the above topic. I understand that a parabola can be formed using a focus and directrix, both created by origami folds, and that Axiom 6 of Origami-Folding (Given two points p1 and p2 and two lines l1 and l2, there...

Homework Statement A mass of 0.4 kg, hanging from a spring (k= 80N/m) is set into an up-and-down SHM. What is the speed of the mass when moving through the equilibrium point? The starting displacement, A, is 0.10 m. Homework Equations a = -kx/m ω = 2pi/TThe Attempt at a Solution I tried to...

This isn't a question, per se. I have to write a 2500 word + research essay on a mathematical concept for school. It's expected that I look into university-level concepts; game theory and abstract algebra are among common subjects. I proposed some ideas to my math teacher, but they were shot...

Thanks, I managed to figure it out though.

The Question Find the limit as x approaches 2 from the left for the equation arctan(3/(x-2)) Work Done I'm not really sure even where to start. My teacher didn't go over this type of question. I don't see any way to mess with the equation to make it so we can plug in 2, and I don't see how...

Homework Statement Calculate the Electron Affinity of F(g) in kJ/mole using Hess' Law. IE1 + IE2 of Sr(g) is 1580 kj Hsub of Sr(s) is 144 kJ Hdiss of F2 is 79 kJ Hf of SrF2 (s) is -1215 kJ Hlatt of SrF2 (s) is -2441 kJHomework Equations | | \/ The Attempt at a Solution 1. Sr(g)+Sr+(g) ->...

Okay, so then: If ΔEk + Epf = W Then: ΔEk = (40N)(10m) - (5kg)(9.8m/s/s)(10(sin(20))) ΔEk = 400 - 167.58 ΔEk = 232.410... = 232.4 J That's the correct answer! Thank you very much. I hadn't thought of just finding the total change in kinetic energy instead of finding them separately.

Sorry, what does ΔUg represent?

Homework Statement A 5.0 kg box slides up a 10 m long frictionless incline at an angle of 20 degrees with the horizontal, pushed by a 40 N force parallel to the incline. What is the change in kinetic energy? Homework Equations Ek = 1/2 mv2 Ep = mghThe Attempt at a Solution I tried to assume...

Great as a question in general, no~t so great for a question worth a third of the marks on a test. (Headbang) (Dull)

So I graphed it on a graphing calculator, and lo and behold, a graph where there is no horizontal tangent line. At this point, I'm hoping I just remembered it wrong; but it's probably just my teacher being a horrible troll again. An eight mark question with no real answer? Sounds just up his...

I can conclude that my teacher is crazy trying to make a bunch of grade elevens solve this on a marked test without explaining it at all. Sorry. Jokes aside: Are you implying that there are no real solutions for this question then?

Okay, so if we plug in x = 0 into $$3\left(x^2+y^2 \right)^{\frac{1}{3}}-2=0$$ $$3\left(y^2 \right)^{\frac{1}{3}}-2=0$$ $$y^{\frac{2}{3}}=2/3$$ $$y^2=(2/3)^3$$ $$y=+/-(8/27)^{\frac{1}{2}}$$ If we substitute that into the original equation: $$(x^2+y^2)^{\frac{2}{3}}=x^2-y^2$$...