Chuyển đọng nào sau đây có thể được coi là sự rơi tự di nếu đc thả rơi A. một chiếc lá
B. một tờ giấy
C. một hòn sỏi
D. một lông chim

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?