Which events cause ferromagnetic materials to magnetize and which events cause them to demagnetize. sort events into the correct category.

answers !
magnetize;
1) place in magnetic field
2) pass electricity through
3) rub on permanent magnet

demagnetize;
1) heat
2)strike
3)place in opposite polarity

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Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.

Aproton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?