How does this action cause the skateboarder's speed to decrease? O A. It increases the maximum static friction of the skateboard.
B. It increases the net force down the hill.
O c. It increases the force of friction.
O D. It decreases the force of friction.

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

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.

In order to complete this lab. you will need to be familiar with some common chemistry terms. complete the chemical change puzzle and list the relevant terms and their meaning below a.rectant b.product c.supernate