Arthur reads an article describing an experiment to test the effects of caffeine on the reaction time of humans—how long it took them to respond to a particular signal. in the experiment, the subjects' reaction times were measured, then they were divided into three groups. one group was given a high dose of caffeine. the second group was given a medium dose of caffeine. the third group was given a sugar pill that had no caffeine. after waiting 45 min for the caffeine to take effect, the reaction times were measured again.

in the experiment arthur read about, what was the dependent variable?
a.
the amount of caffeine given to each person
b.
the type of signal each person responded to
c.
the amount of time the caffeine was given to take effect
d.
the change in reaction times for each person

While listening to operatic solos, musicians process the lyrics and the tunes in separate brain areas. this most clearly illustrates the functioning of different

1point) a skydiver weighing 130 lb (including equipment) falls vertically downward from an altitude of 14,000 ft and opens the parachute after 20 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.85|v|0.85|v| when the parachute is closed and is of magnitude 17|v|17|v| when the parachute is open, where the velocity vv is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. find the speed of the skydiver when the parachute opens. speed is 150.6121788 ft/s find the skydiver's height when the parachute opens. height is 2338.98591 ft find the limiting velocity vlvl after the parachute opens. (think about whether this should be positive or negative.) vl=vl= 7.647 ft/s

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?