a disc starts from rest with an angular acceleration completes 10 revolutions in 2 seconds. the time taken by it to complete 10 more revolution from that instant is

Starting from rest, the disc completes revolutions after seconds according to

with angular acceleration . It completes 10 rev in 2 s, which means

Find the time it takes to complete 20 rev with this acceleration:

so it takes approximately 0.83 s to complete 10 more rev.

the part of the wave he is travelling on is the crest

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered