A 5.0-m-diameter merry-go-round is turning with a 4.0 s period. What is the speed of a child on the rim

0.75pi m/s

Explanation:

d = 5 m

===> r = d/2 = 5/2 = 2.50 m

T = 4 s

w = 2pi *f = 2pi/T = 2pi/4 = pi/2 rad/s

v = w*r = pi/2 *2.5 = 0.75pi m/s

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

your answer is c! hope this : )