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3 years ago

A renewable resource can be replaced in a relatively short amount of time. Question 4 options: True False

Physics

2 answers:

kvasek [131]3 years ago

8 0

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Renewable resources are natural resources that can be replaced in a relatively short period of time or are virtually limitless in supply. Renewable energy resources include wind, sunlight, moving water, biomass, and geothermal energy.

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Hope It Helps!

labwork [276]3 years ago

4 0

Answer:

true

Explanation:

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A 18000 Hz wave has wavelength of 0.03 meters. How fast is this wave traveling?

Alex Ar [27]

Answer:

540m/s

Explanation:

Given parameters:

Frequency of the wave = 18000Hz

Wavelength of the wave = 0.03m

Unknown:

How fast is the wave traveling = ?

Solution:

How fast the wave is traveling is a measure of the speed of the wave;

Speed of wave = frequency x wavelength

Now insert the given parameters and solve;

Speed of wave = 18000 x 0.03 = 540m/s

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3 years ago

Please somebody help i took screenshot ik there is a blank space but look down a little

Dahasolnce [82]

Answer:

Force has a direct relationship to mass and acceleration. Newton's Second Law, force equals mass times acceleration (F=MA), illustrates their general relationship in an equation.

Explanation:

Relationships to remember:

Force and acceleration have a direct relationship, meaning if force increases, acceleration will also increase and vice versa

(Ex: The harder you push a box, the faster it will move)

Mass and acceleration have an inverse relationship, meaning if mass increases, acceleration will decrease and vice versa

(Ex: If you add more furniture in the back of a moving company truck, the truck will move slower than it did before the furniture was added)

Force and mass have a direct relationship, meaning if mass increases, force will also increase

(Ex: You will need to exert less force to lift a 5-pound weight than a 10-pound weight)

And of course, Newton's Second Law, F=MA sums all of this up in 3 letters and a symbol! If you have any more questions about this problem, please comment on my answer :)

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3 years ago

Explain why each element has a unique spectrum of absorption or emission lines.

Naya [18.7K]

Each elements emission spectrum is distinct because each element has a different set of electron energy levels. The emission lines correspond to the differences between various pairs of the many energy levels. The lines (photons) are emitted as electrons fall from higher energy orbitals to lower energies.

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3 years ago

Compare the kinetic energy of a 20,000-kg truck moving at 110 km/h with that of an 80-kg astronaut in orbit moving at 27,500 km/

Ivahew [28]

for the truck :

M = mass of the truck = 20000 kg

V = speed of truck = 110 km/h = 110 (km/h) (1000 m/1 km) (1 h/3600 sec) = 30.6 m/s

kinetic energy of truck is given as

KE₁ = (0.5) M V²

inserting the values

KE₁ = (0.5) (20000) (30.6)² = 9363600 J

for the astronaut :

m = mass of astronaut = 80 kg

v = speed of astronaut = 27500 km/h = 27500 (km/h) (1000 m/1 km) (1 h/3600 sec) = 7638.9 m/s

kinetic energy of astronaut is given as

KE₂ = (0.5) m v²

inserting the values

KE₂ = (0.5) (80) (7638.9)²

KE₂ = 2.33 x 10⁹ J

Ratio of kinetic energy of truck with kinetic energy of astronaut is given as

KE₁ /KE₂ = (9363600)/(2.33 x 10⁹)

KE₁ /KE₂ = 0.00402

kinetic energy of truck is 0.00402 time the kinetic energy of astronaut.

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3 years ago

Does rust have the same properties as iron?

spayn [35]

Answer:

This is a chemical property. If iron does rust, this is a slow chemical change since rust is an iron oxide with different properties than iron metal.

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3 years ago