Recent content by blochwave

See, we went down that train of thought, EXCEPT that 2.25*k is also an option. Why couldn't it be that? If you can prove that Pa>Vf in terms of magnitude, I'll buy that the problem just sucks in that it wants you to assume k is greater than 1, and is otherwise ok

Homework Statement Friend's fiancee gave this problem on a final she was administering and isn't sure how the answer key is right: Boyle's law describes the inverse variation between the volume of a gas and the pressure, y, exerted on it. A balloon with a volume of 2.25 liters is sealed in...

You don't need to(and are told NOT to, and to instead use conservation of energy) use those equations, however you still could as you were given initial velocity, and you know acceleration is g, like always, you would probably have to make a system of equations However what you're sposed to...

I don't even know what he's doing it for, it's something to do with probabilities like I said Check this though: I did the ratio convergence test to make sure he didn't ask a stupid question, forgetting that it only works if the series is geometric Well if you divide any subsequent terms...

Yes, I wrote it down this time to avoid further embarrassment >_>

You guys rock so hard EDIT: Unfortunately I don't A)It WAS x^(m-k), m is a constant distinct from n, sorry it was (1-x)^k, to make it I believe more difficult

Homework Statement Being professionals now we've all forgotten our math skills and I'm trying to impress everyone. P=sum from k=0 to n of (x)^(m-k)*(1-x) Sorry for the hurried lack of latex, it's x^(m-k), and that term is multiplied by (1-x) Homework Equations Uh-oh The...

How'd you get stuck on E? V cross B times the scalar q gives you a vector, and q*E is a vector. Do you remember how to add two vectors? Then you'll have the force vector, with its x, y, and z components

The emf is what is induced by electromagnetic induction in these problems. It IS an induced emf in that sense, but just saying emf should be clear. Emf is basically a voltage but the source isn't from what you'd normally expect a potential difference to arise from. The term is also used in...

Well why use the mass of the planet for the centripetal force equation? For the gravitational force you're looking at some mass, whatever it may be, that you denoted m2, located at the surface of the neutron star This same mass is experiencing the centripetal force, which is being caused...

So you're assuming it launches from the ground, so Ki=1/2*mVi^2 then at some other point it will have slowed down of course, so Kf=1/2*m*Vf^2, and the potential energy will be U=mgh You tried to solve for h as a function of its velocity(which at that point will be the same Vf) as in the...

You typed (1/P)(dP/dt) = ax + b Where a is -0.0001 and b is .0338 and x should be time So you haven't found the function P(t) yet, but there is the equation. After you separate variables you'd have dP/P=(a*t+b)*dt, then you need to integrate and use your initial condition

P'? They want you to solve for P, it's a differential equation. Remember that the x-axis is time, and then it's separation of variables.

I don't know why you tossed the gravitational constant into the equation for centripetal force You have two forces going on here, centripetal and gravity, but what IS actually causing the centripetal force? What is holding the mass in place? Anyways this proceeds extremely similarly to the...

Well my issue was you start here 1/2*m*v^2=mgh It's the VERTICAL velocity you care about, it's 1/2*m*Vy^2=mgh Vy=Vsin(theta) so you get 1/2*m*V^2sin^2(theta)