Four machines contribute the following noise levels in db to a worker's exposure:

machine 1 80 dba

machine 2 86 dba

machine 3 93 dba

machine 4 70 dba

(a) calculate the combined noise-level exposure for this worker.

(b) the offending machine is obviously machine 3. suppose that machine 3 was at a distance of 5 feet away from the worker when the 93 dba level was measured. determine how far away would machine 3 have to be moved to bring the worker's continuous 8-hour combined exposure from all machines down to the osha pel

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.