Asmall button placed on a horizontal rotating platform with diameter 0.328 m will revolve with the platform when it is brought up to a rotational speed of 35.0 rev/min , provided the button is a distance no more than 0.140 m from the axis. what is the coefficient of static friction between the button and the platform? how far from the axis can the button be placed, without slipping, if the platform rotates at 63.0rev/min?

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

Which of these metals are magnetic?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.