Juan gets on a scale in an elevator. The elevator accelerates downward with an acceleration of 3 m/s2, and while this acceleration occurs, the scale reads 445 Newtons. What is Juan's mass? Give your answer in units of kg to two decimal places.

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,?

If anyone who can me with this hw? i would really appreciate it

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little