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kompoz [17]
3 years ago
5

EXPLAIN HOW ENERGY IS TRANSMITTED THROUGH A MEDIUM

Physics
2 answers:
Alex777 [14]3 years ago
7 0
Energy can be transmitted through a medium in one of 3 ways:

Conduction -  This occurs when particles of a substance collide with one another, transferring some of their energy to each other in the process. This generally occurs most rapidly in solids due to the close proximity and order of the particles, and most slowly in gases, due to the sparse nature of the particles.

Convection - This occurs when a fluid has a temperature gradient decreasing with increasing altitude. For example, when a pan of water is heated, the higher energy water molecules at the bottom have a lower density than the lower energy molecules at the top of the pan and travel upwards through the liquid, while their place is taken by the lower energy molecules. This phenomenon also occurs in gases (think hot air balloon).

Radiation - This does not involve the movement of particles whatsoever, instead the energy is being transferred in the form of electromagnetic radiation (such as light). This is how the Sun heats the earth, as there are very few particles in space, certainly not enough for conduction/convection. (Note: this does technically involve the movement of particle called photons that make up the radiation, but they are not treated as physical particles like molecules).

Hope this helps.
jek_recluse [69]3 years ago
5 0
I say it helped then because TrueType had room
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Think of an example of a chemical change that some people might think is NOT a chemical change. Explain why it is.​
AlekseyPX

Answer:

Digesting food

Explanation:

I have people who think that its not true but it is

Hope this helped

7 0
2 years ago
A 75N force is applied to a 15kg box. If the box
icang [17]

Answer:

The coefficient  of kinetic friction is 0.51.

Explanation:

Given that,

Applied force, F = 75 N

Mass of a box, m = 15 kg

The acceleration of the box is 3 m/s²

We need to find the coefficient  of kinetic friction. It is given by the formula as follows :

F=\mu_k F_N

Where,

F_N=mg, is the normal force

\mu_k=\dfrac{F}{mg}\\\\\mu_k=\dfrac{75}{15\times 9.8}\\\\\mu_k=0.51

So, the coefficient  of kinetic friction is 0.51.

6 0
2 years ago
A machine part rotates at an angular speed of 0.07 rad/s; its speed is then increased to 3.4 rad/s at an angular acceleration of
34kurt

Answer:

In first case angular displacement will be 11.55 radian

In second case it will be 4 times the previous case          

Explanation:

We have given that machine rotates at an angular velocity of 0.07 rad/sec

So initial angular velocity \omega _i=0.07rad/sec

And its speed is increases to 3.4 rad/sec

So final angular velocity is \omega _f=3.4rad/sec

Angular acceleration \alpha =0.5rad/sec^2

According to third equation of motion we know that

\omega _f^2=\omega _i^2+2\alpha \Theta

3.4^2=0.07^2+2\times 0.5\times  \Theta

\Theta =11.55radian

Now initial angular velocity and final angular velocity both are doubled but angular acceleration is constant

So \omega _i=2\times 0.07=0.14rad/sec

And  \omega _f=2\times 3.4=6.8rad/sec

So 6.8^2=0.14^2+2\times 0.5\times \Theta

\Theta =46.22radian

So angular displacement will be 4 times the earlier displacement  

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3 years ago
The exact speed of an object in a specific instant is?
GarryVolchara [31]
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instantaneous speed 

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