Help asap! will give brainliest to somebody who helps! John uses a hammer to pull a nail from a plank. The handler of the hammer is 30 cm. The nail puts the 450-N resistance force 2 cm from the pivot. How much force do you need to pull the nail out?

Modify the equation fδt=δ (mv) to find the force of friction.

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)

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow