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IDS 102 Quiz 1

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

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  1. IDS 102 Quiz 1 Jiminy Cricket and mixing water

  2. What do we know about J?

  3. 1a) The Graph: (1 pt) • This is good…

  4. 1a) The Graph: • Is this more useful? (Maybe, maybe not)

  5. 1b) Find the equation (2 pts) • First find the slope • Key question: What’s y? What’s x?

  6. 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.

  7. 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”?

  8. 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

  9. #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.

  10. #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

  11. #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.

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