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1. ### General question pertaining to a thin rod and E

Lambda = charge/length; \lambdar/r^2=E=\lambda/r I feel like a complete idiot for struggling with this for so long..
2. ### General question pertaining to a thin rod and E

I was under the assumption that the electric field for an arbitrary length of wire was 2\lambda/r. In this problem A thin rod extends along the z-axis from z = -d to z = d. The rod carries a charge uniformly distributed along its length with linear charge density lamda. By integrating over...
3. ### Electric field due to a Linear charge density

This is an image of what I'm working with
4. ### Electric field due to a Linear charge density

okay, I am not sure if you have done one of the window optimization problems in calculus, but the shape is similar to that. Two straight rods with a distance 2b between them. The two rods are connect by a semicircular window. B is the length of rod and it is shaped like a parallelogram, as it...
5. ### Electric field due to a Linear charge density

Homework Statement Two long, thin parallel rods, a distance 2b apart, are joined by a semicircular piece of radius b, as shown. Charge of uniform linear density \lambda is deposited along the whole filament. Show that the field E of this charge distribution vanishes at the point C. DO...
6. ### Forces Assignment Questions

Draw the triangle first and look at it. You should notice that point masses at either end of the base of the triangle have a force acting at 60 degrees from the top mass, and a parallel force coming from the opposing end of the base. Calculate the force of gravity between each mass, paying...
7. ### Forces Assignment Questions

Are we talking about the force of gravity between the objects? Or are the objects connected so there will be some tension force on one object due to the other two?
8. ### Calculate the Density of the planet

What I did, was after I calculated the a from my kinematics, I set \frac{G(bigM)m}{r2}=aplanetm The little m's cancel leaving me with the ability to calculate M. The problem now, is which r do I choose? I can choose R of the planet plus rocket height, or R of the planet. It shouldn't make a...
9. ### Calculate the Density of the planet

Homework Statement An astronaut lands on a new planet of radius R=3000km, and wants to measure its density. In order to do that, he drops a stone of unknown mass from the top of the space shuttle, which has a height of 92.5m and measures the time it takes it to reach the ground. t= 5s. What...
10. ### Energy Work Problem, all algebra

Homework Statement A small block is placed at height h on a frictionless ramp inclined at an angle theta. Upon being released, the block slides down the ramp and then falls to the floor (a distance y below the base of the ramp). A small hole is located a horizontal distance x from the end...