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ale4655 [162]
3 years ago
7

Need Help

Physics
1 answer:
ValentinkaMS [17]3 years ago
3 0

The option that correctly compares a pure substance to a mixture is: B. A pure substance can only be separated by chemical means, whereas some mixtures can be separated by physical means.

A pure substance can be defined as a substance that has a definite and constant (fixed) structure and they are typically made up of only a kind of particles. Thus, a pure substance is a chemical substance that has a constant (fixed) chemical composition and properties.

As a result of a pure substance being a chemical substance, it cannot be separated into its constituents by a physical separation technique or method.

Instead, a pure substance being a chemical substance can only be separated by chemical separation technique or method.

In contrast, mixtures can be separated by a physical separation technique or method.

Find more information: brainly.com/question/24615100

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Answer:

Explanation:

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Velocity of sound in water at 20 degree = 1470 m/s

Time taken in to and fro movement in air

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Rest of the time  is

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This time is taken to cover distance in water. If d be the depth of lake

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dimaraw [331]

Answer:

The magnitude of  the electric field is 5.75 N/C towards positive x- axis.

Explanation:

Given that,

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Second charge = 5 nC

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We need to calculate the electric field at the point x = 2 m

Using formula of electric field

E=\dfrac{1}{4\pi\epsilon_{0}}(\dfrac{q_{1}}{r_{1}^2}+\dfrac{q_{2}}{r_{2}^2})

Put the value into the formula

E=9\times10^{9}\times(\dfrac{2\times10^{-9}}{2^2}+\dfrac{5\times10^{-9}}{(8-2)^2})

E=5.75\ N/C

The direction is toward positive x- axis.

Hence, The magnitude of  the electric field is 5.75 N/C towards positive x- axis.

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Explanation:

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