The makes contact with the coil of an ac generator.
a.
conducting brushes
c.
current brushes
b.
slip rings
d.
dynamos

State the formula for density in words and mathematical symbols

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

Why is the bottom layer of a trophic pyrimid the