# Physics

I know this is long but can someone just explain it to me? Please? Don't have to give the answer, I'm just confused :(

1. An experiment was devised to investigate the effects on the temperature of a cup of hot tea when lemon juice is added at different time intervals. Hot and cold water were used instead of tea and lemon juice. First, a container of water heated to 80°C was allowed to sit for 13 minutes. Its temperature was measured at regular intervals. Next, similar temperature measurements were taken for 20 minutes on a new container of heated water, but this time some cold water was added after the 3-minute reading. Finally, the procedure was repeated except that for this last test, the cold water was added after the 13-minute reading. The resulting recorded temperatures were plotted on the graph shown here.

(just remove the spaces) h t t p : / / i. imgur . com / GTgyRXv.png

Based on the information given here, answer the following questions about the experiment:
• What question was asked in the experiment?
• What was the hypothesis, expressed as an if-then statement?
• What were the independent and dependent variables?
• What was the control in the experiment?
• Were there any sources of error in the experiment? If so, what?
• What can be concluded from the data?

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1. What question was asked in the experiment?
What are the effects on temperature change if cool water is added at various times?

• What was the hypothesis, expressed as an if-then statement?
If cool water is to be added to a hot substance to cool it, then the best time is to add it is after several minutes.
• What were the independent and dependent variables?
Independent variable: when the cold water was added
Dependent variable: temperature
• What was the control in the experiment? Hot water without cool water ever added.
• Were there any sources of error in the experiment? If so, what? Probably in surrounding temperature of each cup.
• What can be concluded from the data? add the water near the final temperature desired to get max cooling effect.

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