2.) What would the force of friction be between the surface and wood block if there was no gravity?

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.