thermodynamics: intro

A cup of coffee has a higher temperature than an ice skating rink, and ______ than the rink.

• higher heat

• lower heat

• more thermal energy

• less thermal energy

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

When you sort out a shuffled deck of cards, you are....

• increasing its entropy

• decreasing its entropy

• increasing its thermal energy

• decreasing its thermal energy

What is wrong with this statement?

"When I turn on a burner underneath a pot of water, I'm increasing the amount of heat in the water."

• The water won't stay water; it will boil into steam.

• It's the temperature of the water that's increasing.

• It is incorrrect to talk about the "amount of heat" in something; heat is merely the transfer of thermal energy.

• There is nothing wrong with this statement.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

The specific heat of water is 1 calorie/degree/gram. If I have 5 grams of water, and I want to raise its temperature from 20 degrees to 26 degrees, how many calories of energy do I need?

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NGSS.MS-PS3-4

The first law of thermodynamics states that energy is

• created
• destroyed
• conserved
• created and destroyed

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

When a fast moving car smashes into a pole and stops, this does not violate the first law of thermodynamics because...

• The energy in the car is transformed into thermal energy and sound. The damaged structure also has more potential energy.

• The first law does not apply here because we're not dealing with heat.

• The car will eventually be moving again.

• The energy goes into making the Earth rotate more.

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NGSS.MS-PS2-2

NGSS.MS-PS3-5