Two students described a part of Earth's middle layer. Bob: The deepest part Joe: The semi-fluid part Which part of the middle layer did Bob and Joe describe? (1 point) They both described the mesosphere. They both described the asthenosphere. Bob described the mesosphere and Joe described the asthenosphere. Bob described the asthenosphere and Joe described the mesosphere.

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,?