Add the following displacement vectors: 12 m south and 15 m 55° e of n? ?

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

Looking at this barometer, is the air pressure high or low? what type of weather would you expect? high, bad low, bad high, good low, good

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)