Calculate the work, w, gained or lost by the system (in kj) when a gas expands from 15 l to 35 l against a constant external pressure of 1. 5 atm. 101. 3 j = 1 l × atm.

The correct answer is b, social stratification is needed for a society to exist. marxist theory regarding social stratification is that due to the differing economic capacities among people in society, a natural separation occurs between those that own the means of production and those that sell their labour in the production chain. 

It’s b each orbits at a slower rate than the rate rate which the moon orbits the earth