Cupid fires an arrow that strikes St. Valentine, producing the usual sounds of harp music and bird chirping as
Valentine swoons into a fog of love. If Cupid hears this
telltale sound exactly one second after firing the arrow and
the average speed of the arrow is 40 m/sec, what was the
distance separating them? Take 340 m/sec for the speed of
sound

What occurs during a combustion reaction

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)

More solar radiation is absorbed by earth’s surface than by