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Understanding Thermal Energy and Magnetism: A Comprehensive Review

Explore how thermal energy influences temperature changes during phase transitions and delve into mapping magnetic fields. Review problems for an upcoming test and grasp the nuances of magnetic forces. Reminder: Course Evaluation Window Is Open until Dec. 7th.

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Understanding Thermal Energy and Magnetism: A Comprehensive Review

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  1. TODAY’S OUTCOMES: HEAT ; MAGNETISM - Review how thermal energy affects temperature during a phase change - Begin to study magnets and learn how to map magnetic fields - Complete review problems for upcoming test Reminder: Course Evaluation Window Is Open until Dec. 7th http://mercury.pa.uky.edu/~evaluation/

  2. ANSWERS WILL VARY A BIT ACCORDING TO YOUR DATA............ I had about 30 cc of ice, and required 3 scoops (90 cc) of water at about 50°C to melt it. 3:1 ratio It will cool the coffee down (the marbles/aluminum will absorb thermal energy until they are in equilibrium with the coffee) BUT not as well as the ice, because the ice absorbs thermal energy as it melts, and can actually get the coffee to 0°C as long as there are unmelted ice cubes. 3 cups of 50°C water needed to melt 1 cup of ice (0°C) Each °C contains the same amount of thermal energy in liquid water 1 1/2 cups of 100°C (boiling) water needed to melt 1 cup of ice 14. If you had a solid block of ice that exactly filled a yellow cup and you wanted to melt it, what is the smallest number of cupfuls of boiling hot water that you would need? 15. Marty likes ice-cold coffee, but putting ice in it makes it watery. Her idea is too cool something that doesn’t melt (like glass marbles or a piece of aluminum) in the freezer and put them in her coffee instead of using ice cubes. Is this going to work as well?

  3. Phase Changes : SOLID ⇔ LIQUID LIQUID ⇔ GAS require the transfer thermal energy! You’ve seen 3 examples of this in class now: 1) Ice melting - the temperature did not rise, even though you add thermal energy 2) Water boiling - the temperature does not rise, even though the coffee maker added thermal energy 3) Evaporation - the temperature lowered, even though you didn’t add thermal energy

  4. - Adding/removing thermal energy does not change temperature during a phase change - The difference between thermal energy and temperature - How a temperature plot looks during melting or boiling WHAT YOU ARE EXPECTED TO KNOW:

  5. MAGNETISM TOPICS: Magnetic fields Magnetic forces Relationship between electricity and magnetism

  6. TODAY’S OUTCOMES: HEAT ; MAGNETISM - Review how thermal energy affects temperature during a phase change ✔ - Begin to study magnets and learn how to map magnetic fields - Complete review problems for upcoming test Reminder: Course Evaluation Window Is Open until Dec. 7th http://mercury.pa.uky.edu/~evaluation/

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