An electron moves at some arbitrary angle to the magnetic field direction ( B is in + zˆ direction). The trajectory is a helix with some pitch d. Considering the velocity of an electron in XY plane v and in +z direction vz find d. Hint – consider XY and Z motion independent and calculate the period of circular motion.

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?

Forms of meditation hail from which traditions a ) eastern traditions b ) western traditions c ) eastern and western traditions d ) neither eastern nor western traditions