Why does hot air or hot water rise? Because

it is less dense than cold air or water

A roof has an area of 100 m2 and an U-value of 3. T inside is 22 0C, T outside is 2 0C.

6000 Joules of energy is lost every second through the roof

Why is it better to use Mercury than alcohol in thermometers when high T are measured?

Because alcohol boils at lower temperature than mercury

What does the kinetic theory say?

When T decreases,molecules have less energy, speed decreases

Why is the sun the original source of the renewable energy biomass? Because

sunlight is trapped in plants as they grow

Why do you guys need to study very hard? Because

you want to evolve as a person and learn, school helps!, chances of winning the lotery are really small, Mister Wieldraaijer says so, you are obligated to go to school

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3V Physics Gas Laws, Molecules, Energy changes, transfer etc

8 termsStudBud Administration30 plays

3 VWO Broekhin Roermond

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Questions 8

Answers

1
T₁ = 20 ⁰C, V₁ = 20 cm³, p₁ = 1 bar, T₂ = 20 ⁰C, V₂ = 5 cm³. What is p₂?
p2 = 0.25 bar
p2 = 4 bar
p2 = 0.5 bar
p2 = 2 bar
2
Why does hot air or hot water rise? Because
it has more molecules in the same volume than cold air
the volume is smaller than cold air or water
molecules have more energy in the same volume than cold air
it is less dense than cold air or water
3
A roof has an area of 100 m² and an U-value of 3. T inside is 22 ⁰C, T outside is 2 ⁰C.
12000 Joules of energy is lost every second through the roof
3000 Joules of energy is lost every second through the roof
6000 Joules of energy is lost every second through the roof
9000 Joules of energy is lost every second through the roof
4
A dull black surface is
Good absorber, good radiator
Poor absorber, good radiator
Good absorber, poor radiator
Poor absorber, poor radiator
5
Why is it better to use Mercury than alcohol in thermometers when high T are measured?
Because alcohol expands too slow at high temperatures
Because alcohol boils at lower temperature than mercury
Because the expansion of mercury is 6x greater than alcohol
Because mercury is also better for low T measurements
6
What does the kinetic theory say?
kinetic energy can be changed in electricity, heat or sound
kinetic energy increases when the T decreases
When T decreases,molecules have more energy, speed increases
When T decreases,molecules have less energy, speed decreases
7
Why is the sun the original source of the renewable energy biomass? Because
sunlight evaporates water and this drops down in rain again
sunlight is trapped in plants as they grow
sunlight is used to burn plants in biomass factories
sunlight is used in solar cells to convert to electricity
8
Why do you guys need to study very hard? Because
you want to evolve as a person and learn, school helps!
chances of winning the lotery are really small
Mister Wieldraaijer says so
you are obligated to go to school

3V Physics Gas Laws, Molecules, Energy changes, transfer etc Flashcards | StudBud