Carbon-14 has a half-life of 5730 years after how many half lives will 120 g of carbon-14 decay to 15 g

a. one

b. two

c. three

d. four

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

The respiratory system removes oxygen and water from the body. select the best answer from the choices provided t f

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)