Daily Science pg. 40 Convert the following temperatures: 45 o C into Kelvin 45 o C into Fahrenheit 309 K into Fahrenheit 98 o F into Kelvin 299 K into Celsius 8 o F into Kelvin Give an example of conduction, convection, and radiation. Explain why over exposure to the sun or to X-rays can be harmful. Calculate the kinetic energy of a wheel that has a mass of 65 kg and is rolling with a velocity of 4.5 m/s. Calculate the potential energy of a bomb that is falling from a height of 48 m and has a mass of 15 kg. Calculate the potential energy of a ball dropped from E-wing that weighs 4.8 N and is being dropped 6 m. Calculate the mass of a person in a wheelchair if they are rolling at a velocity of 0.7 m/s and have 20 j of kinetic energy.

Daily Science pg. 40 Convert the following temperatures: 45 o C into Kelvin 45 o C into Fahrenheit 309 K into Fahrenheit 98 o F into Kelvin 299 K into

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Daily Science pg. 40 Convert the following temperatures:

45oC into Kelvin 45o C into Fahrenheit 309 K into Fahrenheit 98oF into Kelvin 299 K into Celsius 8oF into Kelvin

Give an example of conduction, convection, and radiation. Explain why over exposure to the sun or to X-rays can be harmful.

Calculate the kinetic energy of a wheel that has a mass of 65 kg and is rolling with a velocity of 4.5 m/s.

Calculate the potential energy of a bomb that is falling from a height of 48 m and has a mass of 15 kg.

Calculate the potential energy of a ball dropped from E-wing that weighs 4.8 N and is being dropped 6 m.

Calculate the mass of a person in a wheelchair if they are rolling at a velocity of 0.7 m/s and have 20 j of kinetic energy.

Page 2: Daily Science pg. 40 Convert the following temperatures: 45 o C into Kelvin 45 o C into Fahrenheit 309 K into Fahrenheit 98 o F into Kelvin 299 K into

Specific HeatPg. 41

Page 3: Daily Science pg. 40 Convert the following temperatures: 45 o C into Kelvin 45 o C into Fahrenheit 309 K into Fahrenheit 98 o F into Kelvin 299 K into

Conductors and insulators Conductor- a material through which energy

can be transferred as heat. Examples:

Insulator- a material that transfers energy poorly. Examples:

Page 4: Daily Science pg. 40 Convert the following temperatures: 45 o C into Kelvin 45 o C into Fahrenheit 309 K into Fahrenheit 98 o F into Kelvin 299 K into

Specific Heat The amount of energy needed to change the

temperature of a substance by a certain amount is what determines if a substance will be a good or poor conductor.

Specific heat is the quantity of heat needed to raise the temperature of 1 kg of substance by 1 K.

Specific heat is a physical property.

Page 5: Daily Science pg. 40 Convert the following temperatures: 45 o C into Kelvin 45 o C into Fahrenheit 309 K into Fahrenheit 98 o F into Kelvin 299 K into

Specific heat values Every substance has a unique specific heat. The letter C is used to denote specific heat. Water has one of the highest specific heat

values (4,186 J/kg x K)

Page 6: Daily Science pg. 40 Convert the following temperatures: 45 o C into Kelvin 45 o C into Fahrenheit 309 K into Fahrenheit 98 o F into Kelvin 299 K into

Calculating Specific Heat Heat= mass x temperature change x specific

heat value Q = m x ∆T x C Units:

Mass- Temperature- Specific Heat- Heat-

Page 7: Daily Science pg. 40 Convert the following temperatures: 45 o C into Kelvin 45 o C into Fahrenheit 309 K into Fahrenheit 98 o F into Kelvin 299 K into

Practice Problems How much energy is needed to increase the

temperature of 0.755 kg of iron from 283 K to 403 K?

How much energy must a refrigerator absorb from 225 g of water to decrease the temperature of the water from 35oC to 5oC?

Page 8: Daily Science pg. 40 Convert the following temperatures: 45 o C into Kelvin 45 o C into Fahrenheit 309 K into Fahrenheit 98 o F into Kelvin 299 K into

State changes Heat makes objects change state. Energy of a substance either raises the

substance’s temperature or changes the substance’s state. NOT BOTH AT THE SAME TIME.

This is why there

are horizontal lines

on a phase change

diagram.

Heating up the classroom with Thermal Energy Measure of kinetic energy of molecules Thermometer Fahrenheit Celsius Kelvin

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