Recent content by ExoP

I guess I need the friction force between the sand and the tool

Can you explain a little more? what are the parameters? :/

Homework Statement Hi! I want to calculate the torque acting on an arm while it is digging something. I only have the formula tau= Fxd. Anyone that know a good formula for this? Homework Equations The Attempt at a Solution tau= Fxd, where d is the length of the link. I can't...

That's true. Well, imagine a box with no top. It has a thickness, width, length and height. From that, how am I going to calculate how much soil it can contain? Maybe should start with that hehe, np

Homework Statement Hi, I really need help with a problem. I have a plate and need to calculate how much soil it can dig. Homework Equations [b]3. The Attempt at a Solution [/b I first calculated the volume of the scoop (a square scoop) and after that I'm stuck. Anyone have an...

Hi, I was thinking of something: How are one supposed to calculate the moment needed for a scoop to scoop up a sample of e.g. sand? Does the classical p=mv work? Any ideas or comments?

Yes, I just don't remember that much about this since it was 4 years ago that I calculated anything similar to this. Thanks!

Do you have any idea of the geometry, how to solve this problem maybe? :)

Oh, I did not know that. Well, I was thinking of something like this: http://www.aanda.org/articles/aa/full/2001/24/aa10472/img8.gif Where po and Z is the radius of the circle.

I have actually no idea. From now, I only have the wavelength which I calculated, the eV range, the focal length and mirror radius. I'm stuck.. :/

Homework Statement Hi! I'm having a problem with one assignment and I would really need som help. The question is: The Chandra X-ray telescope is used for observations in the 0.1-10 keV range. Focal length is 10 m, max mirror radius is 0.6 m. What is the largest reflection angle in the...

Hi! I'm having a problem with one assignment and I would really need som help. The question is: The Chandra X-ray telescope is used for observations in the 0.1-10 keV range. Focal length is 10 m, max mirror radius is 0.6 m. What is the largest reflection angle in the optics (assuming...

Hi! I need help with a problem regarding orbital maneuvre. The question is: You're doing a first-order analysis on a new satellite in an elliptical orbit with eccentricity e=0.20 and altitude 700 km. Can you design the orbit so that no maneuvers are necessary to maintain it? Where should...

Or, may I ask this. I have 2 images of the Sun, one when Earth is at aphelion and the other one at perihelion. By using the images, and using helpful data, how can I calculate these distances? :S

Hello, Thanks! I have already calculated the AU by using images of the Venus transit :) How do I do it with other planets , for example calculate the distance to Mars? I need something orbiting in front of it right? :S