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Rus_ich [418]
3 years ago
6

Which best describes how heat energy moves within a system?

Physics
2 answers:
Rzqust [24]3 years ago
8 0
<span>Heat energy is transferred from warmer objects to cooler objects.

</span>
devlian [24]3 years ago
5 0

Answer:

This question is  not complete

Explanation:

There are three ways in which heat is transferred, they are

  • Conduction: Here, heat is transferred from a hot object to a cooler object when both objects come in contact with one another. Here, there must be a contact between the two bodies. This is so because, the particles of the hot objects have a higher kinetic energy than the cooler object, and when they come in contact with the cooler ones, they transfer these energy to the cooler ones. Metals are generally good conductors of heat.
  • Convection: Here, heat is transferred in a liquid or a gas. Hot liquids or gases transfer there heat when they come in contact with cooler ones. There must be contact in this case also. For example, when a kettle of water is boiled, the water at the base of the kettle passes heat energy to the water at the top of the kettle.
  • Radiation: This does not require physical contact but a substance receives heat energy as a result of thermal radiation. For example, the sun produces heat but does not need to touch the metals on earth before they absorb the heat from the sun. So, heat is transferred without a medium or through open space here.
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If the object represented by the FBD below has a mass of 2.5 kg, what is the acceleration of the object?
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Answer:

4 m/s² down

Explanation:

We'll begin by calculating the net force acting on the object.

The net force acting on the object from the left and right side is zero because the same force is applied on both sides.

Next, we shall determine the net force acting on the object from the up and down side. This can be obtained as follow:

Force up (Fᵤ) = 15 N

Force down (Fₔ) = 25 N

Net force (Fₙ) =?

Fₙ = Fₔ – Fᵤ

Fₙ = 25 – 15

Fₙ = 10 N down

Finally, we shall determine the acceleration of the object. This can be obtained as follow:

Mass (ml= 2.5 Kg

Net force (Fₙ) = 10 N down

Acceleration (a) =?

Fₙ = ma

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Eduardwww [97]

Answer:

v = 23.66 m/s

Explanation:

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a = acceleration = 0.56m/s²

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Simply substitute the known values into the equation:

v² = u² + 2as

v² = 0 + 2(0.56)(500)

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