||| the most dangerous particles in polluted air are those with diameters less than 2.5 mm because they can penetrate deeply into the lungs. a 15-cm-tall closed container holds a sample of polluted air containing many spherical particles with a diameter of 2.5 mm and a mass of 1.4 * 10-14 kg. how long does it take for all of the particles to settle to the bottom of the container

An air-filled capacitor is formed from two long conducting cylindrical shells that are coaxial and have radii of 26 mm and 103 mm. the electric potential of the inner conductor with respect to the outer conductor is - 700 v (k = 1/4πε 0 = 8.99 × 109 n · m2/c2) the energy stored in a 1.0-m length of this capacitor is closest to

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.

Is the vertical component of velocity ever zero?