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3 years ago

What is a radio wave made up of? Molecules? Electrons? Other?

2 answers:

4 0

Radio waves are radiated by charged particles when they are accelerated. They are produced artificially by time-varying electric currents, consisting of electrons flowing back and forth in a specially-shaped metal conductor called an antenna. ... Radio waves are received by another antenna attached to a radio receiver.

Ksivusya [100]3 years ago

4 0

Answer: Wave Currents??

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Air is compressed in a reversible, isothermal, steady- flow process from 15 psia, 100°F to 100 psia. Calculate the work of compr

mixas84 [53]

Answer:

|W|=169.28 KJ/kg

ΔS = -0.544 KJ/Kg.K

Explanation:

Given that

T= 100°F

We know that

1 °F = 255.92 K

100°F = 310 .92 K

$P _1= 15 psia$

$P _1= 100 psia$

We know that work for isothermal process

$W=mRT\ln \dfrac{P_1}{P_2}$

Lets take mass is 1 kg.

So work per unit mass

$W=RT\ln \dfrac{P_1}{P_2}$

We know that for air R=0.287KJ/kg.K

$W=RT\ln \dfrac{P_1}{P_2}$

$W=0.287\times 310.92\ln \dfrac{15}{100}$

W= - 169.28 KJ/kg

Negative sign indicates compression

|W|=169.28 KJ/kg

We know that change in entropy at constant volume

$\Delta S=-R\ln \dfrac{P_2}{P_1}$

$\Delta S=-0.287\ln \dfrac{100}{15}$

ΔS = -0.544 KJ/Kg.K

3 0

3 years ago

In order to tell whether the lubrication system is working properly, check the

kvv77 [185]

Metering valves. These valves should be initially adjusted to provide adequate lubrication to each location

8 0

2 years ago

Privacy settings allow account owners to decide who can

VLD [36.1K]

Access their accounts.

anyone can search for them online.
they only meet in person with who they choose.
no one can view their personal information (other than companies they give it to.)

6 0

3 years ago

What is the difference between science and engineering?

jek_recluse [69]

Answer:

The following table is among some of the discrepancies between some of the different topics.

Explanation:

Science seems to be the application of structured organized facts which could be interpreted scientifically because when engineering would be a branch of science which deals with either the profession of acquiring including using technological, computational, economical and severity of adverse effects to design and manufacture equipment and devices that seem to be beneficial to mankind.
Science would be a set of information and established frameworks whereas the use of these models and information to construct structures as well as mechanisms becomes engineering.

4 0

3 years ago

A piston–cylinder assembly contains 5.0 kg of air, initially at 2.0 bar, 30 oC. The air undergoes a process to a state where the

Archy [21]

Answer:

Work transfer is - 97.02 KJ. It means that work is given to the system.

Heat transfer = - 97.02 KJ . It means that heat is rejected from the system.

Explanation:

Given that

m= 3 kg

P₁=2 bar

T=T₁=T₂=30 °C

T=303 K

P₂=2.5 bar

PV= Constant

This is the isothermal process .

We know that work for isothermal process given as

$W=P_1V_1\ln \dfrac{P_1}{P_2}$

$W=mRT\ln \dfrac{P_1}{P_2}$

For air

R= 0.287 KJ/Kg.K

Now by putting the values

$W=mRT\ln \dfrac{P_1}{P_2}$

$W=5\times 0.287\times 303\ln \dfrac{2}{2.5}$

W= - 97.02 KJ

So the work transfer is - 97.02 KJ. It means that work is given to the system.

We know that for ideal gas internal energy is the only function of temperature.The change in internal energy ΔU

ΔU = m Cv ΔT

Here ΔT= 0

ΔU =0

From first law of thermodynamics

Q= ΔU +W

ΔU = 0

Q= W

Q= - 97.02 KJ

Heat transfer = - 97.02 KJ . It means that heat is rejected from the system.

8 0

4 years ago