The 6-kg collar is released from rest at a and slides down the inclined fixed rod in the vertical plane. the coefficient of kinetic friction is 0.7. calculate: (a) the velocity v of the collar as it strikes the spring, (b) the maximum deflection x of the spring, and (c) if the coefficient of kinetic friction is changed to 2.8, what would be the maximum deflection x of the spring?

Carbon 14 is a naturally occurring stable

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.