A boy who weighs 30 kg is skateboarding at a speed of 5 m/s. What is the boys kinetic energy? 750 joules
75 joules
150 joules
375 joules

Consider this initial-rate data at a certain temperature for the reaction described by

Stage in which a typical star has completely stopped fusion

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.