A charge of -8.50 nC is spread uniformly over the surface of one face of a nonconducting disk of radius 1.25 cm. Part A Find the magnitude of the electric field this disk produces at a point P on the axis of the disk a distance of 3.00 cm from its center V AED ROO? = -1.49.10 Submit Previous Answers Request Answer * Incorrect; Try Again: 5 attempts remaining Part B Suppose that the charge were all pushed away from the center and distributed uniformly on the outer rim of the disk. Find the magnitude of the electric field at point P. VAXT RO? NC Submit Request Answer Part C if the charge is all brought to the center of the disk, find the magnitude and direction of the electric field at point P. VAETOO?

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)