A particle completes half its journey with uniform velocity u. Then it

moves at first with a uniform velocity v through half the time required to

complete the remaining half of the journey and afterwards with a

uniform velocity w through the remaining half of the said time.

Determine the average velocity of the particle over the entire path.

Diamond will scratch quartz. true or false

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 would be the radius of the earth if it had its actual mass but had the density of nuclei? express your answer to two significant figures and include the appropriate units.