Ascrew is a type of simple machine. if we look closely at a screw, we see that it is really a wrapped around a central core.

a) wedge
b) lever
c) fulcrum
d) inclined plane

6) (a) calculate the absorbance of the solution if its concentration is 0.0278 m and its molar extinction coefficient is 35.9 l/(mol cm). the depth of the cell is 5 mm. (b) what is the %t? (7) calculate the absorbance of the solution if the transmitted light intensity is 70% of the initial light beam intensity