A sample of an unknown material weighs 300 N in air and only 200 N when submerged in an alcohol solution with a density of 0.70 x 103 kg/m3 . What is the force due to gravitational acceleration? What direction does this force act?
What is the magnitude of the buoyant force? What direction does this force act?
What is the density of the unknown material?

When fat comes in contact with sodium hydroxide, it produces soap and glycerin. determine whether this is a physical change or a chemical change. explain your answer

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

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)