A string attached to an oscillator at one end forms 5 nodes and produces a frequency of v=2.5 kHz. The string is L=0.75 m long and is under a tension of T=243 N. What is the linear density of the string in kilograms per meter?

Idon’t quite understand this problem

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse

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)