Answer:
The thermal energy is carried by electromagnetic waves
Explanation:
There are three types of transfer of heat (thermal energy):
- Conduction: conduction occurs when two objects/two substances are in contact with each other. The heat is transferred from the hotter object to the colder object by the collisions between the molecules of the two mediums.
- Convection: convection occurs when a fluid is heated by an external source of heat. The part of the fluid closer to the heat source gets warmer, therefore it becomes less dense and it rises, and it is replaced by the colder part of the fluid, which is colder. Then, this part of fluid is heated as well, so it gets warmer, it rises, etc.. in a cycle.
- Radiation: radiation occurs when thermal energy is carried by electromagnetic waves. Since electromagnetic waves do not need a medium to propagate, this is the only method of heat transfer that can occur through a vacuum (so, in space as well).
Indeed, the Sun emits a lot of electromagnetic radiation, which travels through space and eventually reaches the Earth, heating it.
Complete question:
a cube of iron was heated to 70C and transferred to a beaker containing 100g of water at 20c the final temperature of the water and the iron was 23c what are the heat capacity of iron and water ?
Answer:
The heat capacity of iron which is equal to heat capacity of water is 1254 J.
Explanation:
Given;
initial temperature of the iron, t₁ = 70 °C
mass of water, m₂ = 100 g
initial temperature of water, t₂ = 20 °C
final temperature of the mixture, t = 23 °C
The heat lost by iron = heat gained by water
Thus, the heat capacity of iron = heat capacity of water
Heat gained by water is given by;
Q = mcΔθ
Q = mc(t - t₂)
where;
c is the specific heat capacity of water = 4.18 J/g°C
Q = (100 )(4.18)(23 - 20)
Q = 1254 J
Therefore, the heat capacity of iron which is equal to heat capacity of water is 1254 J.
Answer:
a= -1.01m/s^2
Explanation:
A) We define all the variables that are given,
In this way
Acceleration = a
We obtain the Normal assuming 5% of the potato reading scale, so
We add forces to reach equilibrium, and you get
** The notation of the symbols is done according to the notation of the graph
So,
B) When making pressure it is understood that the shape takes the perpendicular direction of the direction of the force that is performed. If the pressure remains constant, the scale will also increase in its measurement.
Answer: 1.77kg
Explanation:
Using the concept or hooke's law, the force (F) applied to a string is directly proportional its extension (e)
F=ke
K is the elastic constant
If the mass applied initially is 0.59kg i.e 5.9N force, we have
5.9=ke... (1)
If a second block is attached let's say 'm', its force will be 10m, and the extension will become 3e
10m = 3ke ... (2)
Dividing eqn 1 by 2,
5.9/10m = ke/3ke
5.9/10m = 1/3
10m = 5.9×3
m = 5.9×3/10
m = 1.77kg