PART I: ATOM SCREEN 1. Go to the website: phet. colorado. edu. Click on HTMLS simulations on top right of screen and choose the Build an Atom
(http://phet. colorado. edu/en/simulation/build-an-atom)
2. Explore the Build an Atom simulation with your group. As you explore, talk about what you find. List two things your
group observed in the simulation.
simulation
a.
b.

If the force on an object is in the negative direction, the work it does on the object must be [2 points a) negative. b) positive c) the work could be either positive or negative, depending on the direction the object moves

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1