15 POINTS! What are some differences and similarities between Electromagnetic and Mechanical waves?

Answers

Answer 1

Answer: Elecromagnetic waves can travel through a vacuum, but a mechanical wave cannot.Mechanical waves can only exist in a medium, such as air or water. Electromagneticwaves behave like waves and particles, but mechanical waves only behavelike waves.

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Why are large astronomical bodies such as planets and stars round? I need a 6th grade answer.

Answers

Well,

Large astronomical bodies are round because at their formation, gravity acted as the force to bring all of the matter together to form the body. Since the gravity was acting from a point and bringing everything toward it, the final shape of the mass is spherical. Non-round bodies are mostly that shape because other bodies "modified" the landscape.

They are round because of their enormous gravity. It pulls everything towards it strongly enough that every part of the body is the same distance from the center.

Identify two ways of changing the strength of an electric force

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When you talk about "the strength of an electric force" in middle school, I'm pretty sure you're talking about the force between two electrostatic charges that either pulls them together or pushes them apart.

The strength of that force depends on

-- the product of the amounts of charges on the two charged objects

-- the distance between the centers of their charges.

magnetism and an increase/decrease in temperature

Explain the scientific meaning of the word random

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Explanation:

In general the word random means by chance. The event that occurs unknowingly rather than according to plan is called at its randomness.

But in science, the word random relates with a type of event that is described by its probability distribution.

Also, random means the entropy of the system i.e. it is a thermodynamic quantity that represents the amount of energy in the system that is unavailable for doing work.

Which was not a cause of the Spanish-American War in 1898?A.
the sinking of the Maine

B.
Spanish cruelties in Cuba

C.
yellow journalism

D.
President McKinley's desire for war

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(d) President McKinley did not want war.

D, President McKinley's desire for war.

How does an electric motor work

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AC motors work a slightly different way: they pass alternating current through opposing pairs of magnets to create a rotating magnetic field, which "induces" (creates) a magnetic field in the motor's rotor, causing it to spin around. You can read more about this in our article on AC induction motors.

Select all of the answers that apply. The Doppler radar can tell you many things about the weather, like _____.
a) wind direction
b) wind speed
c) humidity
d) temperature
e) intensity of precipitation
f) location of precipitation
g) air pressure

Answers

The answers are --

a) wind direction
b) wind speed
e) intensity of precipitation
f) location of precipitation

Select all of the answers that apply.

The Doppler radar can tell you many things about the weather, like .

wind direction
wind speed
humidity
temperature
intensity of precipitation
location of precipitation
air pressure

(the ones that are bolded are the correct answers...)

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Galileo conducted controlled experiments to find out if the mass of the pendulum bob affected the period of the swing. Write a description of how he might design his experiment. Thanks!