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4 years ago

Which best describes how heat energy moves within a system?

Physics

2 answers:

Rzqust [24]4 years ago

8 0

<span>Heat energy is transferred from warmer objects to cooler objects.

</span>

devlian [24]4 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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How does a centripetal force cause circular motion? It acts at a right angle to the object's motion and causes the object to con

poizon [28]

Answer:

Centripetal force comes from the Latin, centrum = centre and petere=to seek. It acts perpendicular to the object path, towards the center of the curve. This results in change of the direction of the object's velocity but not in change of object's speed.

So only the first option is correct: It acts at a right angle to the object's motion and causes the object to constantly change direction.

Explanation:

7 0

4 years ago

Read 2 more answers

Water towers store water above the level of consumers for times of heavy use, eliminating the need for high-speed pumps. How hig

Zielflug [23.3K]

Answer: Height should be 44.1 m.

Explanation:

Pressure exerted by stationary water stored at a height is,

P = ρgh

4.41 × $10^{5}$ = 1000× 10× h

solving we get,

h = 44.1 m

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3 years ago

A man pushes an 80-N crate a distance of 5.0 m upward along a frictionless slope that makes an angle of 30 with the horizontal.

laiz [17]

Answer:

The work done by the man is 260 J.

(E) is correct option.

Explanation:

Given that,

Force = 80 N

Distance = 5.0 m

Angle = 30°

Acceleration = 1.5 m/s²

Let F be the man's force

We need to calculate the force

Using balance equation

$F-mg\sin\theta=ma$

$F-80\sin30=\dfrac{80}{9.8}\times1.5$

$F=\dfrac{80}{9.8}\times1.5+80\sin30$

$F=52\ N$

We need to calculate the work done by the man

Using formula of work done

$W=F\dotc d$

$W=52\times 5.0$

$W=260\ J$

Hence, The work done by the man is 260 J.

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3 years ago

Read 2 more answers

weathering can be either chemical or physical process that action of water causes physical weathering rocks which examples

aivan3 [116]

Frost wedging is a type of physical weathering of rock.

Explanation:

Physical or mechanical weathering affects the rock structurally but does not change the chemical composition. Mechanical forces will rub, break or shatter the rock surfaces. Wedging, abrasion, exfoliation are different types of physical weathering.

Water is one of the main sources which alter the structure of the rocks physically.

Frost wedging occurring due to flow of freezing water over the rocks. This frozen water enters the rock through the cracks and crevices on the rock surface, and will expand inside and makes the rocks to crack further and breaks it apart.

Please mark brainliest

3 0

3 years ago

At what angle should the axes of two polaroids be placed so as to reduce the intensity of the incident unpolarized light to 13.

prohojiy [21]

Answer:

θ = 66.90°

Explanation:

we know that

$I= \frac{I_0}{2}cos^2\theta$