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2 years ago

Which statement describes a chemical property related to the particles that make up a material

Physics

1 answer:

JulijaS [17]2 years ago

4 0

Answer:

Salt crystals are hard and brittle because they are made up of atoms that combine by ionic bonding.

Explanation:

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Emily learns that ancient astronomers, such as Ptolemy, created a model of the solar

Vinil7 [7]

Answer:

Explanation:

In Ptolemy's geocentric model of the universe, the Sun, the Moon, and each planet orbit a stationary Earth. He had them in circle orbits.

Galileo's model showed that the sun was the centre of the universe. That everything orbited around the earth. He also saw that they we in elliptical orbits.

Galileo proved Ptolemy wrong because Ptolemy said that everything orbited the earth and they orbited in circle but they orbit in ovals (elliptical) and that they orbit the sun.

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3 years ago

The idea of a field was needed for which reason?

ra1l [238]

Answer:

i believe b

Explanation:

for example, gravity works without directly contacting objects so a field helps visualize how gravity objects without physical interaction

7 0

3 years ago

Read 2 more answers

A nuclear fission reactor produces electricity. What is the role of the fuel, the control rods, water, and generator in this pro

natima [27]

The appropriate response is the third one. A generator is utilized to enact the control poles which contain radioactive isotopes. Once initiated, these isotopes start an atomic splitting chain response. Water in a cooling tank monitors the rate of response as electrons radiated from the response are encouraged through wires to homes and organizations.

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3 years ago

Read 2 more answers

To understand the concept of intensity; the relationship between the power of the source and the intensity of the wave; and the

frez [133]

Answer:

a. 4.77 W/ $m^{2}$

b. 2.122 W/ $m^{2}$

c. 13.78 W/ $m^{2}$

d. 69 km

Explanation:

power P of speaker = 60 W

distance d of speaker = 1.0 m

intensity I of speaker = P/4π $d^{2}$

I = 60/(4 x 3.142 x $1^{2}$ ) = 60/12.568

Intensity = 4.77 W/ $m^{2}$

at a distance of 1.5 m, intensity will be

I = P/4π $d^{2}$

I = 60/(4 x 3.142 x $1.5^{2}$ ) = 60/28.278

Intensity = 2.122 W/ $m^{2}$

combined intensity of the two front speakers will be 2 x 4.77 = 9.54 W/ $m^{2}$

combined intensity of the two back speaker will be 2 x 2.122 = 4.244 W/ $m^{2}$

total sound intensity perceived by the driver will be the superimposition of these four speakers.

I = 9.54 + 4.244 = 13.78 W/ $m^{2}$

Minimum discernible intensity of sound = $10^{-12}$ W/ $m^{2}$

each speaker produces 0.06 W of power.

We assume that each speaker spreads outward evenly.

from I = P/4π $d^{2}$ ,

d = $\sqrt{\frac{P}{4*\pi*I } }$

d = $\sqrt{\frac{0.06} {4*\pi*10^{-12 } }$ = 69094.35 m ≅ 69 km

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4 years ago

Choose all of the following that are examples of electromagnetic radiation.Sound waves ,Microwaves, All of these, "The Force", I

Anna35 [415]

Answer:

Microwaves

Infrared Waves

Visible Light

Explanation:

Electromagnetic waves consist of oscillating electric and magnetic field, which vibrate in a direction perpendicular to the direction of motion of the wave (for this reason, they are called transverse waves).

Electromagnetic waves are the only waves that do not need a medium to propagate: in fact, they can travel through a vacuum as well.

Electromagnetic waves are classified into 7 different types depending on their frequency. From highest to lowest frequency, they are:

Gamma rays

X-rays

Ultraviolet

Visible light

Infrared Waves

Microwaves

Radio waves

All the other options are a different type of waves, called 'mechanical waves', therefore they are not electromagnetic waves.

4 0

4 years ago