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Papessa [141]
3 years ago
13

Why isn’t earth a closed system? A. It reflects and radiates energy B. Matter continually cycles between the spheres C. Large am

ounts of matter come to earth from space D. Earthquakes, volcanoes, and Hot Springs release energy from Earth’s interior
Physics
2 answers:
SOVA2 [1]3 years ago
8 0

Answer:

C. Large amounts of matter come to earth from space

Explanation:

A closed system is a system where only energy is transferred to the surrounding. No matter will be transferred into the system or out of the system.

By that definition earth is not closed system. since large amount of matter from distant supernovas, asteroids etc. has been deposited on earth from the very beginning.

We mine Gold, uranium for our use which was deposited on earth by supernovas So all deposits of iron, aluminum etc. come from stars massive than our sun.

The amount of all these mineral deposits are pretty high, needless to mention the addition of mass by meteorites and the loss of mass by sending space crafts to space

So we can say earth is not a closed system

Note:

But for our current calculations we treat earth as a closed system since no mineral deposit is made on earth at the moment by supernova burst (life on earth will come to an end if that happens now). The loss of mass by sending objects into space and the addition of mass by meteorites are very negligible compared to the mass of earth. So for simplicity purpose we consider earth as a closed system

Irina18 [472]3 years ago
5 0

Earth is actually considered a closed system so this question is confusing.

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The kinetic energy of an object with a mass of 6.8 kg and a velocity of 5.0 m/s is [BLANK] J. (Report the answer to two signific
dmitriy555 [2]
<h2>Hello!</h2>

The answer is:

The kinetic energy of the object is equal to 85 J.

<h2>Why?</h2>

The kinetic energy involves the speed and the mass of an object in motion. We can calculate the following the work needed to speed an object (kinetic energy) using the equation:

KineticEnergy=\frac{1}{2}mv^{2}

Where,

m, is the mas of the object

v, is the speed of the object.

Now, we are given:

mass=m=6.8kg\\speed=v=5\frac{m}{s}

So, substituting and calculating the kinetic energy of the object, we have:

KineticEnergy=\frac{1}{2}*6.8kg*(5\frac{m}{s})^{2}

KineticEnergy=\frac{1}{2}*6.8kg*(25\frac{m^{2}}{s^{2}})

KineticEnergy=\frac{1}{2}*170kg\frac{m^{2}}{s^{2}}

KineticEnergy=85kg\frac{m^{2}}{s^{2}}=85J

We have that the kinetic energy of the object is equal to 85 J.

Have a nice day!

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3 years ago
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Answer:

A

Explanation:

In section A, she is moving in constant speed because there's a flat line which indicates speed remained same as time passed. In section c, there's a flat line but look at y axis for this one, it is 0 which means there's no speed during this part. B and D have varying speeds as there is a change in y axis variables as time passes.

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λ = 3.125 m

λ = 2.83 m

<h3>Further explanation</h3>

Given

Frequency of radio : 96 MHz and 106 MHz

Required

The wavelength

Solution

Wavelength : from the crest to the crest of the next wave or the trough to the trough

Frequency (f): number of waves in one second

v = λ x f

λ = v : f

Input the value :

f = 96 MHz = 96 x 10⁶ Hz

λ = v : f

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