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4 years ago

Indicate on the chart whether you would classify each model as representing an element, compound, or mixture.

Physics

2 answers:

Nesterboy [21]4 years ago

7 0

Element
Mixture
Element
Element
Compound
Compound
Mixture
Compund

Ne4ueva [31]4 years ago

4 0

Answer:

1 compound

2 mixture

3 elements

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3 years ago

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3 years ago

It is important to understand the differences between chemical and physical changes. Chemical changes result in new substances,

sergiy2304 [10]

Explanation:

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Physical changes are easily reversible but chemical changes are not.

Physical changes involves no change in mass like chemical changes.

Physical changes require little energy unlike chemical changes.

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3 years ago

A girl weighing 600 N steps on a bathroom scale that contains a stiff spring. In equilibrium, the spring is compressed 1.0 cm un

8_murik_8 [283]

Answer:

The spring constant is 60,000 N

The total work done on it during the compression is 3 J

Explanation:

Given;

weight of the girl, W = 600 N

compression of the spring, x = 1 cm = 0.01 m

To determine the spring constant, we apply hook's law;

F = kx

where;

F is applied force or weight on the spring

k is the spring constant

x is the compression of the spring

k = F / x

k = 600 / 0.01

k = 60,000 N

The total work done on the spring = elastic potential energy of the spring, U;

U = ¹/₂kx²

U = ¹/₂(60000)(0.01)²

U = 3 J

Thus, the total work done on it during the compression is 3 J

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3 years ago

Convection is a mode of heat transfer for which types of objects? A. solids and liquids B. gases and solids C. gases only D. liq

Airida [17]

The correct answer to the question will be D). Liquids and gases.

EXPLANATION:

Convection is the type of mode of heat transfer in which there will be actual motion of particles from one part to the another part of a fluid.

In case of liquids, the particles which are present at the bottom of the container get heated up first and become lighter. The lighter particles will go up and the top heavier particles will move downward. Again the same process will be repeated. In this way, a convection cycle is produced.

For instance, heating of water.

In case of gases, same thing happens just like liquid. The air particles will be heated up first and becomes lighter. These heated particles will move upward. Due to this, an empty space will be created in that region. In order to occupy the empty space, the air will flow from another region which is at low temperature as compared to the heated region. Again, the same process will be repeated which will results into the formation of convection cycle .

Hence, convection occurs both in liquids and gases.

7 0

3 years ago

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