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3 years ago

Which property of a substance is not altered by a physical change?

Physics

2 answers:

Lelu [443]3 years ago

7 0

Answer: Composition of matter

Explanation: All substances, compounds, elements, have different physical and chemical properties, which can be altered by changes in the physical and chemical conditions in which these substances are found. For example, a boiling point of a substrate may be achieved, or by cooling it may lead to a freezing point. However, in any of these cases, the composition of matter does not change.

Bezzdna [24]3 years ago

6 0

Composition Is the property

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When a small object is launched from the surface of a fictitious planet with a speed of 52.9 m/s, its final speed when it is ver

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The escape speed of the planet is 41.29 m/s.

Explanation:

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Speed = 52.9 m/s

Final speed = 32.3 m/s

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Using formula of kinetic energy

$K.E=\dfrac{1}{2}mv^2$

$K.E=\dfrac{1}{2}\times m\times(32.3)^2$

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Using formula of kinetic energy

$\text{escape kinetic energy}=\text{launch kinetic energy}-\text{excess kinetic energy}$

$\dfrac{1}{2}mv^2=\dfrac{1}{2}mv^2-\dfrac{1}{2}mv^2$

$\dfrac{1}{2}\times v^2=\dfrac{1}{2}\times(52.9)^2-\dfrac{1}{2}\times(32.3)^2$

$v=\sqrt{2\times(\dfrac{1}{2}\times(52.9)^2-\dfrac{1}{2}\times(32.3)^2)}$

$v=41.29\ m/s$

Hence, The escape speed of the planet is 41.29 m/s.

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3 years ago

Explain the increase in pressure of a gas when its volume is decreased at constant<br> temperature.

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Answer:

For a gas held at constant temperature, we can apply Boyle's law, which states that the product between the gas pressure and its volume is constant:

$PV=const.$

where

P is the pressure

V is the volume

As we see from the equation, P and V are inversely proportional to each other: this means that when the volume is decreased, the pressure increases, and vice-versa. The reason for that is that when the volume is decreased, the gas is compressed, so the molecules of the gas come closer to each other, so they collide more frequently with the wall of the container, exerting therefore a greater pressure.

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4 years ago