In fluids, heat is often transferred by convection, in which the motion of the fluid itself carries heat from one place to another. Another way to transfer heat is by conduction, which does not involve any motion of a substance, but rather is a transfer of energy within a substance (or between substances in contact).
These are my favorite riddles/questions, the answer will be he will wait till nighttime and go through the first door. <span />
Answer:
"If athletes consume carbohydrates, their running times will increase"
Independent variable: whether the athletes eat carbohydrates
Dependent variable: running times
Experimental group: the group that eats the pasta dinner
Control group: the group that eats the steak dinner with no carbohydrates
The purpose of using random assignment is to make sure that there are no selection factors that might affect the group. For example, if she asked the boys to eat one food and the girls to eat another, that wouldn't be random, and would introduce the sex of the athletes as a possible confounding variable.
Explanation:
(note that this is kind of a weird question: why would you want to *increase* running times?)
