See photo, please. 25 points.

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

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.

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume