Question

a penny is placed .1 m from the center of a turntable. if the coefficient of static friction between the penny and the turntable is .5, the maximum linear speed at which the penny can travel without slipping is approximately

a) .49m/s
b) .7 m/s
c) 1.3 m/s
d) 1.4 m/s
e) .2 km/s

explain please

Answer 1

The friction on the penny will equal centripetal force. At that equality, then linear speed is w*radius.

Answer 2

thanks

Answer 3

but.. what formula do i use?

Answer 4

ohh... nevermind!