Recent content by haydn

Problem: An electron moving parallel to the x-axis has an initial speed of V1 at the origin. It's speed is reduced to V2 at the point x=2 (V2<V1). Calculate the potential difference between the origin and the point x=2. Which point is at the higher potential? I was able to calculate the...

That makes sense. Thanks for the clarification.

I have the formula W=q\DeltaV. Where \DeltaV is the change in electric potential, and q is a charge. Say I wanted to move a point charge some distance in an electric field (created by another point charge) and calculate the work associated with this movement. Does the q in the above equation...

Nevermind, I got it.

Homework Statement Two spherical conductors of radii r1 and r2 are separated by a distance much greater than the radius of either sphere. The spheres are connected by a conducting wire as shown in the figure. The charges on the spheres in equilibrium are q1 and q2, respectively, and they are...

Yes I drew free body diagrams. For case A I have a force going to the right via the ribbon and a friction force going to the left. I believe these cancel out for a net force of 0. For case B I have a force going straight up via the ribbon and a friction force perpendicular to that, going...

Thanks for the reply. I'm not sure I'm understanding your explanation completely. Please tell me if I'm right or wrong here. For my first question, in case A, the net torque is 0 because the friction force and the force applied via the ribbon cancel each other out. So incorporating the...

Question 1: I was told here that in Case A, the torque is equal to zero. I'm not really seeing that. I know torque is equal to rFsin\theta. If I draw a vector from the rotation point (the very center of the spool) to the point where the force is being applied, I get that the force and r...

Homework Statement Two astronauts, each having a mass M, are connected by a rope of length d having negligible mass. They are isolated in space, orbiting their center of mass at speeds v. (Use M, d, and v as appropriate in your equations for each of the following questions.) By pulling on the...

Ok, isn't friction force equal to the coefficient of friction times the normal force though? ..and the normal force of the block = M1g since it isn't moving vertically? Thanks for the help by the way, besides that everything is clear now.

Homework Statement The sliding block has a mass of 0.800 kg, the counterweight has a mass of 0.460 kg, and the pulley is a hollow cylinder with a mass of 0.350 kg, an inner radius of 0.020 m, and an outer radius of 0.030 m. The coefficient of kinetic friction between the block and the...

Ok great. I figured out the right answer now. Thanks for the help!

Ok, so in that first equation you said was right there should be a negative in front of VBoat? I don't know what happens when the backpack is caught... I thought all the momentum of the backpack would transfer to the boat+person system.

MPVP = (M1+M2+MB)VBoat, Final ?

I'm still confused how to set up the equations for parts A and B... would it be, for part A: (MB+M1+M2)VBoat = MPVP