Ameter stick is free to rotate about an axis through one of its end. find the force f needed to balance this meter stick if the mass 60 is grams and the force f is applied at the opposite end of the stick and it makes an angle of 60° with the stick.

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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)

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false