Hello,
I am currently a high school physics teacher in Chicago. I am thinking about going back to school to get a PHD in Physics. I currently have a B.S. in Applied Physics and a secondary education license.
I would like to find a way to go back and get a PHD. I cannot afford to quit my job...
So, I am doing my undergraduate research project in Quantum Cryptography, and I have some confusion in a few areas, especially in the topic of continuous variable quantum key distribution.
From what I understand,
Discrete Variable - Single photon. That is, for example, the BB84 protocol. Bob...
I'm confused, how is the initial velocity zero? It says that the fuel gives us a v0 of 3.0*105?
The problem is when I plug in the values of the conditions into my final equation, (equation 2).
The problem states:
Typical chemical fuels yield exhaust speeds of the order of 103 m/s. Let us imagine we had a fuel that gives v0 = 3 × 105 m/s. What initial mass of fuel would the rocket need in order to attain a final velocity of 0.1c for a final mass of 1 ton?
I derived the equation in the...
Homework Statement
A particle with mass, m, is subject to an attractive force.
\begin{equation}
\vec{F}(r,t) = \hat{e}_r \frac{k}{r^2}e^{-\beta t}
\end{equation}
Find the Hamitonian of the particle
Homework Equations
H = T + U
Where T is the kinetic energy and U is the potential...
Homework Statement
Suppose you have a Triangle with the vertices, (0,0) (1,1) and (0,1). Integrating along that path.
I have some differential function dZ where Z = Z(x,y)
Homework EquationsThe Attempt at a Solution
[/B]
If I need to integrate, then I need to find the limits of...
if you're asking if I know how to take partial derivatives, then yes. The issue lies in I don't know where to begin since there is ##\hat{r}##, ##\hat{\theta}##, ##\hat{\phi}## in the equation.
Homework Statement
Find te gradient of the following function f(r) = rcos(##\theta##) in spherical coordinates.
Homework Equations
\begin{equation}
\nabla f = \frac{\partial f}{\partial r} \hat{r} + (\frac{1}{r}) \frac{\partial f}{\partial \theta} \hat{\theta} + \frac{1}{rsin\theta}...