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# IDS 102 Quiz 1 - PowerPoint PPT Presentation

IDS 102 Quiz 1. Jiminy Cricket and mixing water. What do we know about  J?. 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.

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### IDS 102 Quiz 1

Jiminy Cricket

and mixing water

• This is good…

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

• First find the slope

• Key question: What’s y? What’s x?

• 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.

• 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”?

• 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

• 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.

• 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

• 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.