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3 years ago

EXPLAIN HOW ENERGY IS TRANSMITTED THROUGH A MEDIUM

2 answers:

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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If you and your friend are riding your bikes side by side and your reference points are each other, are you in motion? Explain y

geniusboy [140]

If your ref points are each other and not the surrounding environment, at the same speed you would both appear to be stationary

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3 years ago

While moving in, a new homeowner is pushing a box across the floor at a constant velocity. The coefficient of kinetic friction b

Citrus2011 [14]

Answer:

$\theta = 66.7 degree$

Explanation:

since force is applied downwards at some angle with the horizontal

so here we will have

$F_n = mg + Fsin\theta$

now we know that the box will not move if applied force is balanced by frictional force on it

so we will have

$Fcos\theta = \mu F_n$

$F cos\theta = \mu (mg + F sin\theta)$

$F(cos\theta - \mu sin\theta) = \mu mg$

$F = \frac{\mu mg}{cos\theta - \mu sin\theta}$

so here we can say

$cos\theta - \mu sin\theta > 0$

$tan\theta = \frac{1}{\mu}$

$\theta = tan^{-1}\frac{1}{\mu}$

$\theta = tan^{-1}(\frac{1}{0.43})$

$\theta = 66.7 degree$

6 0

3 years ago

How does the lever arm change if you decrease the angle of the force?

Vladimir79 [104]

Answer:

The lever arm could decrease or increase depending of the initial angle.

Explanation:

The lever arm d is calculated by:

d = rsin(θ)

where r is the radius and θ the angle between the force and the radius.

So, the increse or decrees of d depends of the sin of the angle θ, if the initial angle is greather than 90° and the angle decrease to an angle closer to 90°, the lever arm will increase but if the initial angle is 90° or lower and the angle decrease, the lever arm will decrease.

8 0

3 years ago

What are two ways to change the state of a substance?

weeeeeb [17]

Solid to liquid
Liquid to solid

By adding or removing heat energy aka thermal energy

7 0

3 years ago

Read 2 more answers

A protein molecule in an electrophoresis gel has a negative charge. The exact charge depends on the pH of the solution, but 30 e

Reika [66]

Answer:

7.401 * 10^(-15) N

Explanation:

30 electrons will have a charge:

30 * -1.6022 * 10^(-19) C

= - 4.806 * 10^(-18) C

The relationship between electric field and electric force is:

E = F/q

This means that force, F, is

|F| = |E|*|q|

|F| = |1540| * |-4.806 * 10^(-18)|

|F| = |-7401.24 * 10^(-18)|

|F| = 7.401 * 10^(-15) N

7 0

3 years ago