5. Suppose you have three identical drinking cups: one made of plastic, one foam, and one paper. You want to find out which cup will keep your hot cocoa hot for the longest time.

a. Phrase a formal question for this experiment.

b. What is your hypothesis?

c. What is the experimental variable?

d. What are three important control variables?

e. What type of evidence will you collect to test your hypothesis?

f. Challenge: Conduct your experiment and summarize your findings.

a) How the cooling speed changes with glasses of different materials?

b) The glass material influences the cooling rate

c)  temperatures initial, final and the time

d) the control variable  is time

e)temperature of the beverage heated in a given time

f) best material for insulation was expanded

Explanation:

This is a problem of how to formulate an experiment using the scientific method

a) a question for this problem to follow.

     How the cooling speed changes with glasses of different materials?

b) the hypothesis of the experiment is:

    The glass material influences the cooling rate

c) we have the independent variable that the experimenter controls

   the material of the glass, the initial temperature of the drink and the cooling time

the dependent variable is the one that is measured

    the temperature of the drink and the time  

d) the control variable  is time

e) the evidence would be the temperature of the beverage heated in a given time

f) When conducting the experiment, the thermal conductivity of the material is the most important factor, the one with the lowest thermal conductivity is the one that keeps the drinks longer

in general, the conductivity ends of paper 0.24 W/m K  and that of plastic is 0.06 W / m K, of expanded  0.03 W / m K

From these values it is experienced that the best material for insulation was expanded

because if the tool that you are using is not balanced it there would be false mass.