A flea stands on the end of a 1.0 cm long sweep second hand of a clock that rests
horizontally on a table. What is the minimum
coefficient of static friction which would
allow the flea to stay there without slipping?
Include an appropriate free-body diagram.

The rotation speed, w, is 2*pi radians/60 seconds = 0.105 rad/s and r = 0.01 m

The flea needs centripetal force given by

Fc = m*w^2/r

That force must come from friction given by

Ff = mu*N = mu*m*g

So

m*w^2/r = mu*m*g

Substitute the data, cancel the m's, and solve for mu.

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.

explanation:

as the height from which the ruler was dropped increased, the speed of the ruler at ryan's hand increased.