Caffeine produces its mentally stimulating effects, in part, by blocking _____ receptors in the brain.

Explain the difference between mood and emotion. Must include a minimum 3 sentences and give examples of each to receive full credit. 

Which influential scientist inspired psychologists, such as William James and William McDougall, to devise lists of instincts to account for human behavior?

Leptin, Neuropeptide Y, and Insulin are the 3 main regulators of body weight and metabolism. 

THC is associated with which of the following psychoactive drug categories?

Psychoactive drugs are highly addictive because they affect which brain receptor types?

question8.png The picture above shows three masses, two of which are on a frictionless table, the third being suspended by a cable connected via a massless pulley to the other blocks. Find magnitude of the acceleration of the masses, and also find the tension T1. (Try drawing free body diagrams for the system).

What angle does the vector that points from the origin of the x-y plane to the point (2.0, 3.0) make with respect to the x-axis?

Two dimensionless vectors are plotted in the x-y plane. The first vector has a magnitude of 5 and points at an angle of 20 degrees above the positive x-axis, the second vector has a magnitude of 8 and points at an angle of 40 degrees below the positive x-axis. What are the x and y components of the sum of these two vectors?  question_4.png

A baseball is thrown upwards at a 45-degree angle with respect to the ground. Its initial speed is 25 m/s. How long does it take the baseball to drop back down to its initial height?