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My name is Ann [436]
3 years ago
9

If the temperature of an iron sphere is increased A)its density will decrease .B)its volume will decrease. C)its mass will decre

ase. D)its density will increase. E)its density will remain unchanged

Physics
2 answers:
babymother [125]3 years ago
5 0

Answer:

A) Its density will decrease

Explanation:

When an object is heated, its volume increases. This is due to the fact that the particles in the medium vibrate more (if it is a solid) or they move more (if it is a liquid or a gas), therefore they tend to occupy a larger space.

At the same time, the mass of the object does not change, because the mass just represents the amount of matter contained in the object, so it does not increase/decrease at different temperatures.

The density of an object is defined as the ratio between the mass (m) and the volume (V):

d=\frac{m}{V}

We said that the mass remains unchanged while the volume increases: since the density is inversely proportional to the volume, this means that the density decreases.

Murrr4er [49]3 years ago
3 0

If the temperature of an iron sphere is increased , then A) its density will decrease

<h3>Further explanation</h3>

This problem is about Density.

Density is the ratio of mass to the volume of the object.

\large {\boxed {\rho = \frac{ m }{ V } } }

<em>ρ = density of object ( kg / m³ )</em>

<em>m = mass of object ( kg )</em>

<em>V = volume of object ( m³ )</em>

When the iron sphere is heated, it will expand. This expansion causes an increase in the volume of the sphere.

The volume expansion of the iron sphere could be calculated using this following formula.

\large {\boxed {V = Vo ( 1 + 3 \alpha \Delta t )} }

where:

<em>V = final volume after expansion ( m³ )</em>

<em>Vo = initial volume before expansion ( m³ )</em>

<em>α = coefficient of expansion ( /K )</em>

<em>Δt = change in temperature ( K )</em>

The mass of the iron ball does not change, so according to the formula above, the density of the iron sphere will decrease.

This is because the density is inversely proportional to the volume of the object.

The greater the volume of the object, the smaller the density of the object.

<h3>Learn more</h3>
  • Velocity of Runner : brainly.com/question/3813437
  • Kinetic Energy : brainly.com/question/692781
  • Acceleration : brainly.com/question/2283922
  • The Speed of Car : brainly.com/question/568302

<h3>Answer details</h3>

Grade: High School

Subject: Mathematics

Chapter: Density

Keywords: Temperature , Density , Iron , Sphere , Volume , Mass

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#1 Not sure where to start. This is for AP Physics!
yaroslaw [1]

First,

\rho=\dfrac mV

where \rho is density, m is mass, and V is volume. We can compute the volume of the roll:

2.7\,\dfrac{\mathrm g}{\mathrm{cm}^3}=\dfrac{1275\,\mathrm g}V

\implies V\approx472.22\,\mathrm{cm}^3\approx4.72\,\mathrm m^3

When the roll is unfurled, the aluminum will be a rectangular box (a very thin one), so its volume will be the product of the given area and its thickness x. Note that we're assuming the given area is not the actual total surface area of the aluminum box, but just the area of the largest face (i.e. the area of one side of the unrolled sheet of aluminum).

So we have

V=Ax

where A is the given area, so

4.72\,\mathrm m^3=\left(18.5\,\mathrm m^2\right)x

\implies x\approx0.255\,\mathrm m=255\,\mathrm{mm}

If we're taking significant digits into account, the volume we found would have been V=470\,\mathrm m^3, in turn making the thickness x=250\,\mathrm{mm}.

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3 years ago
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Fed [463]

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Explanation:

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stepan [7]

Answer:

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Newton's law of acceleration -  "a net external force changes the velocity of the object. The drag of the aircraft depends on the square of the velocity. So the drag increases with increased velocity."

Newton's law of Action/Reaction - "As a plane flies, the force of the air hitting the plane is always equal and opposite to the force of the plane pushing against the air. The force generated by the engine pushes against air while the air pushes back with an equal and opposite force."

Hope this helps! god bless :)

Please give me brainliest!

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Kaylis [27]

Answer:

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Explanation:

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