CHEMISTRY MIDDLE SCHOOL

How long would it take for a car to travel 200km if it has an aventage speed of 55 km/ hr

Answers

Answer 1

Answer:

Answer: 3.64 hours

Explanation:

Formula of Average speed : $\text{Average speed}=\frac{\text{Distance}}{\text{Time}}$

Given : Distance = 200km ; Average speed = 55 km/ hr

To find : Time

Substitute values for distance and average speed in the above formula , we get

$55=\frac{200}{\text{Time}}\n\n\Rightarrow\text{Time}=(200)/(55)=3.63636363636\approx3.64\ hr$

Hence, it would take 3.64 hours for a car to travel 200km .

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What is a solution?what is the solvent of a solution

Answers

A simple solution is basically two substances that are evenly mixed together. One of them is called the solute and the other is the solvent. A solute is the substance to be dissolved (sugar). The solvent is the one doing the dissolving (water).

Answer:

it isnt any

Explanation:

i think

What happens to an electromagnetic wave as it passes from space to matter

Answers

In an electromagnetic spectrum, when an electromagnetic wave passes from space to matter, some part of the energy is absorbed by the matter and it increases its energy.

What is electromagnetic spectrum?

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

Learn more about electromagnetic spectrum,here:

brainly.com/question/23727978

#SPJ2

When an electromagnetic wave passes from space to matter, some part of the energy is absorbed by the matter and it increases its energy. The wave may reflect and some part may pass through the matter depending on the amount of energy they have. The amplitude of the wave decreases if some parts of it are reflected.

What is the mass of the block of iron illustrated below?

Answers

Explanation:

Given that,

The dimensions of the block of iron is 2 cm, 10 cm and 5 cm

To find,

The mass of the block.

Solution,

We know that, the density of iron is, d = 7.874 g/cm³

Density, $d=(m)/(V)$

Where

m is mass and V is volume

Solving for m,

$m=d* V$

The block is in the form of a cuboid, $V=lbh$

So,

$m=d* l* b* h\n\nm=7.874 * 2* 10* 5\n\nm=787.4\ g$

Answer,

The mass of the block of iron is $787.4\ g$ .

Reference,

brainly.com/question/5189059

Answer : 787.4 g

Explanation : With the given information; the volume of the block will be equal to = 5 cm X 10 cm X 2 cm = 100 $cm^(3)$ .

Therefore, the volume will be100 $cm^(3)$ .

but density of iron is found to be $7.874 g/cm^(3)$

So, now calculating for mass; on the basis of the density formula;

which is density = mass/volume; so, mass = density X volume;

Therefore, mass will be 7.874 g X 100 = 787.4 g

mass of the iron block = 787.4 g

Which of the following is NOT a good technique for managing used oil? A) Have specific, labeled catch pans available for technicians who are collecting oil B) Spills in your shop and any releases on pavement or outside should be poured down a drain C) Do not use oil containers for antifreeze or other non-similar fluids D) Be prepared for oil spills with the proper absorbents

Answers

The answer is: B) Spills in your shop and any releases on pavement or outside should be poured down a drain.

Pouring used oil down a drain can cause damege to environment.

Oil is nonpolar substance and does not dissolve in the water (polar molecule), used oil remain existent in the drain and sewer or in the environment.

Small spills create a cumulative effect with significant impact on the environment.

Untended spills inside a shop can spread to an inside drain connected to the storm sewer system and cause floods.

Why must every ecosystem include producers as well as other organisms

Answers

Answer:

An ecosystem must contain producers, consumers, decomposers, and dead and inorganic matter. All ecosystems require energy from an external source – this is usually the sun. ... Consumers eat producers – they are unable to make their own food and so must eat other plants and animals. (All animals are consumers.)

Explanation:

google helps

During what stage of the cell cycle does replication occur

Answers

During Mitosis, DNA is replicated during the S-phase of Interphase.

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