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IDS 102 Quiz 1

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1a) The Graph: (1 pt)

- This is good…

1a) The Graph:

- Is this more useful? (Maybe, maybe not)

1b) Find the equation (2 pts)

- First find the slope
- Key question: What’s y? What’s x?

1b) The equation

- Then find the intercept
- Choose ONE point on your graph…
- …such as (15 C, 76 J) (what’s y? what’s x?)

Notice that the intercept is NEGATIVE!

We knew this from the graph.

1b) The equation

- So the equation is…
( Jiminy) = (7.2)( Celsius) – 32

Hint: write it in a way so that youcan’t forget: “what’s y? what’s x”?

1c) Specific temperatures (2 pts)

- In degrees Jiminy, water freezes at…
(7.2)(0 Celsius) – 32 =-32 degrees Jiminy

- In degrees Jiminy, water boils at…
(7.2)(100 Celsius) – 32 =688 degrees Jiminy

#2) Complete the sentence (1 pt)

- When we say that one object is warmer than another, what we mean is that the warmer object has a higher temperature.
- When a warm object is placed in contact with a cold object the warm object gives some heat to the cold object.

#3) Mixing water

- a) (2 pts) If only 20 calories changes hands…
- The 50 gram water sample (initially at 20) warms up, so we just need to figure out how much:
- The 20 gram water sample (initially at 55 C) cools down by

#3) Mixing water

- b) (2 pts) Once heat transfer has stopped…
- The final temperature will be

You could also solve this by preparing a table. The table would have to be large enough that a total of 500 calories could be transferred from the warm water to the cool water.