Erythemal ultraviolet dose is reached by the exposure to the LE-30 lamp during 4 minutes at a distance of 1 m from the source. Calculate the exposure time required to receive the preventive dose at a distance of 5 meters from the source?

Which of the following are not typically included in the periodic table? a. atomic mass b. element symbol c. isotopes d. number of electrons

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.

Explain what will happen if decomposers were apsent from a forest ecoysystem.