The ball is traveling 90 mph (about 40m/s) when it reaches home plate. if the ball travels at this speed the whole distance from the pitcher to the batter, how many seconds does it take? show the work and steps!

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,?

What happens to an isotope during radioactive decay?

What is the increase in density of a medium due to wave travel?