Unlike a phonograph record that has a constant angular speed, a cd scans information at a constant linear?
r speed (130 cm/s).
does the cd rotate at a constant or varying
angular speed?
1. varying angular speed.
2. constant angular speed.

Aproton is projected toward a fixed nucleus of charge +ze with velocity vo. initially the two particles are very far apart. when the proton is a distance r from the nucleus its velocity has decreased to 1/2vo. how far from the nucleus will the proton be when its velocity has dropped to 1/4vo?

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87