Choose all the answers that apply. Which of the following is an example of conduction?

Chemistry

2 answers:

Viefleur [7K]3 years ago

4 0

Hey there!

Conduction is the transfer of heat via physical contact of solids.

A) The fireplace heating the room does not physically touch any part of the room. It is transferring its weight through waves, or radiation, not physical touch. Incorrect

B) The heat from the stove is transferring to the frying pan because the frying pan is placed on the hot stove. It is transferring to the pan through physical contact, so this is conduction. Correct

C) This may appear to be correct, but this is actually an example of convection, or the transfer of heat via gasses and liquids. The pan was heated up by the stove, which was transferred into the water. As it is a liquid, it is convection. Incorrect

D) Soup is not necessarily considered a liquid; convection usually refers to water vapor and water itself, so this would be an example of conduction, as the spoon and soup are touching. Correct

E) The Sun is not touching the atmosphere; it is transferring heat via waves or radiation. Incorrect

Therefore, our correct answers are B and D.

I hope this helps!

HACTEHA [7]3 years ago

3 0

Hey there!

Conduction is the transfer of heat via physical contact of solids.

A) The fireplace heating the room does not physically touch any part of the room. It is transferring its weight through waves, or radiation, not physical touch. Incorrect

B) The heat from the stove is transferring to the frying pan because the frying pan is placed on the hot stove. It is transferring to the pan through physical contact, so this is conduction. Correct

D) Soup is not necessarily considered a liquid; convection usually refers to water vapor and water itself, so this would be an example of conduction, as the spoon and soup are touching. Correct

E) The Sun is not touching the atmosphere; it is transferring heat via waves or radiation. Incorrect

Therefore, our correct answers are B and D.

I hope this helps!

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If air is a fluid, why do we not include the buoyant force caused by the displacement of air by the objects in this experiment?

uysha [10]

Archimedes' principle allows us to find that the reasons why the thrust is not written when a body is in the air is:

The thrust of air is about 800 times less than the thrust of a fluid

In general the other forces (weight, tension) are much greater than thrust

Archimedes' principle establishes that the thrust is equal to the weight of the dislodged liquid (fluid)

B = ρ g V

Where B is the thrust, ρ and V the density and volume of the fluid, respectively, g the acceleration due to gravity.

In the attachment you have a diagram of a system in equilibrium in air and water, we can see that in the two cases for a system in equilibrium

B -W = 0

B = W

Let's find the value of the thrust in each case and compare

$B_{air} = \rho_{air} g V_{air}$

$B_{water} = \rho_{water} \ g V_{water}$

Used the density

$\rho_{air} = \ 1.26 \ kg/m^3 \\\rho_{water} = 997 kg/m^3$

$B_{air} = 1.26 \ g \ V_{air}\\B_{water} = 997 \ g \ V_{water}$

Suppose that the volume of the two bodies is the same

$B_{water} = 792 B_{air}$ r

We can see that the thrust in air or other gas is about 800 times less than the thrust in liquids. This is the reason that in many problems the thrust is not written when the body is in the air.

In conclusion, using Archimedes' principle, we find that the reason why the healed thrust is not written for a body is in the air is: