A gas at constant temperature is confined to a cylinder with a movable piston. The piston is slowly pushed into the cylinder, decreasing the volume of a gas. The pressure increases. What are the variables in this experiment? (What is changing?) a. temperature and time
b. time and volume
c. volume and pressure
d. pressure and temperature

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?

Is the time in tennessee the same as florida