You need a 450-microgram sample of gold, but you only have a mass balance that measures in decigram. Convert the amount of gold you need to decigrams by comparing the exponents. Provide your answer in scientific notation.

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.