Cattle ranchers and dairy farmers rarely allow all of their animals to reproduce. instead, they practice selective breeding and only encourage the reproduction of animals with specific features.

which of the following cows would a dairy farmer most likely choose to reproduce?
a.
a cow that makes a lot of milk
b.
a cow that can run quickly
c.
a cow with thick, soft fur
d.
a cow with large, strong hooves

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

Which sound characteristic is not affected by the relative motion of an object

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)