When light of wavelength 240 nm falls on a cobalt surface, electrons having a maximum kinetic energy of 0.17 ev are emitted. find values for the following. (a) the work function of cobalt ev (b) the cutoff wavelength nm (c) the frequency corresponding to the cutoff wavelength hz

If a simple machine reduces the strength of a force, what must be increased?

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)

It is really hard for me right know