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Nostrana [21]
3 years ago
8

When determining if a change to matter is physical or chemical, you would observe key indicators to use as clues. What is the mo

st correct explanation that a physical change has occurred?
a.fireworks exploding, because energy is released as light and heat
b.gasoline burning, because it forms water vapor and carbon dioxide
c.crushing an ice cube, because the chemical structure of the ice cube is changed
d.dicing potatoes, because the molecules are separated but remain the same substa
Physics
2 answers:
Alex73 [517]3 years ago
6 0
D. A physical change means that the object can be broken into different pieces, but it still remains that same object.
zhannawk [14.2K]3 years ago
4 0

Answer:

D

Explanation:

Even after being cut, the potatoes are still potatoes

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Adding more pulleys to a system of pulleys _____ needed to lift an object.
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Points A (-9,2), B (2,-9), and C (-9,-9) are placed in three different quadrants of a Cartesian coordinate system. Convert each
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3 years ago
Jupiter's moon Io has active volcanoes (in fact, it is the most volcanically active body in the solar system) that eject materia
kramer

Answer:

The height reached by the material on Earth is 91 km.

Explanation:

Given that,

Mass M_{Io}=8.93\times10^{22}\ kg

Radius = 1821 km

Height h_{Io}=500\ km

Suppose we need to find that how high would this material go on earth if it were ejected with the same speed as on Io?

We need to calculate the acceleration due to gravity on Io

Using formula of gravity

g =\dfrac{GM_{Io}}{(R_{Io})^2}

Put the value into the formula

g=\dfrac{6.67\times10^{-11}\times8.93\times10^{22}}{(1821\times10^{3})^2}

g=1.79\ m/s^2

Let  v be the speed at which the material is ejected.

We need to calculate the height

Using the formula of height

H=\dfrac{v^2}{2g}

Using ratio of height of earth and height of Io

\dfrac{H_{e}}{H_{Io}}=\dfrac{\dfrac{v^2}{2g_{e}}}{\dfrac{v^2}{2g_{Io}}}

\dfrac{H_{e}}{H_{Io}}=\dfrac{g_{Io}}{g_{e}}

Put the value into the formula

\dfrac{H_{e}}{H_{Io}}=\dfrac{1.79}{9.8}

\dfrac{H_{e}}{H_{Io}}=0.182

H_{e}=0.182\times H_{Io}

H_{e}=0.182\times500

H_{e}=91\ km

Hence, The height reached by the material on Earth is 91 km.

3 0
3 years ago
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