PHYSICS MIDDLE SCHOOL

The form of energy in fossil fuels is what kind of energy?

Answers

Answer 1
Answer: solar energy or sunlight...
Answer 2
Answer: It's thermal energy.

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Drag each statement to the correct location on the chart. Classify the events as being a cause or an effect of pollution. urbanization oil spill smog desertification deforestation leaky landfill contaminated water

Answers

Answer:

Urbanization, oil spill, leaky landfill and deforestation are causes of pollution while desertification, smog, contaminated water are the effects of pollution.

Explanation:

Urbanization is generally associated with an increase in the number of industries. The waste materials in different forms from the factories pollute air, water and soil.

The effluents from factories released into rivers cause water pollution and harm the aquatic life. Water contaminated by industrial waste becomes unsuitable for drinking. Forests play a major role in controlling the amount of carbon dioxide in the atmosphere.

Deforestation increases the amount of carbon dioxide in the atmosphere.  Oil spills usually occur in oceans and seas and it causes water pollution and threatens aquatic life.

Answer:

Cause

industrial wastes dumped into rivers

oil spilled on land mixes with runoff

sewage dumped into rivers

Effect

destroyed natural habitats

fish die-off

spread of disease

Explanation:

plato

What is the formula for volume using density and mass

Answers


The definition of density is

                                                       Density                  = (mass) / (volume)

Multiply each side by 'volume' :    (density) x (volume) = (mass)

Divide each side by 'density' :                         Volume = (mass) / (density)
 
V=M/D
volume=mass/density

In an open system such as a campfire matter can

Answers

In open system such as campfire matter can be exchanged between system and surroundings.

What is matter?

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.

Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.In open systems which are not limited by the boundaries exchange of matter can take place between system and surroundings .

Learn more about matter,here:

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In an open system such as a campfire, matter can lose particles, gain particles or exchange particles.

What two variables are being graphed?In what units is each variable measured?
What is the force of gravity on the rocket at the planet's surface?
What is the force of gravity on the rocket at a distance of two units (twice the planet's radius from its center)?
In general, how does the force of gravity pulling on the rocket change as the distance between it and the planet increases?

Answers


-- The relationship between the distance from the planet's center and the force of gravity on the ship has been graphed.  That's the reason for the labels on the axes.

-- The distance from the planet's center is labeled in multiples of the planet's radius.

The force of gravity on the ship is labeled in multiples of 1 million newtons.

-- The force of gravity on the rocket at the planet's surface  (1 radius from the center) is  4 million newtons. (about 899,203 pounds)

-- The force of gravity on the rocket at a distance of two units (twice the planet's radius from its center) is 1 million newtons.

-- In general, as the distance between the rocket and the planet increases, the force of gravity pulling on the rocket decreases. 

From our studies of the nature of gravity, we know that the force is inversely proportional to the square of the distance between the center of the rocket and the center of the planet.  We might not notice it from the graph, because there's only one labeled point that clearly shows it.  (2radius, 1/4 of the surface force).

If we have been really attentive to our studies and have done all of our gravity homework, we know that the equation of the purple line on the graph is

  Force  =  (4 million newtons) / (Distance)²     for  Distance >= 1 radius.

PLEASE HELP!!!!!!suppose that mA is 8.1 kg and mBis 6.5kg. The distance between their centers is 0.5o m.Calculate the force of attraction between these two bodies?

Answers



Somewhere in your book or your notes, you must have met the formula for the
gravitational attraction between two bodies.  If you can go back and find it, you
only need to plug your numbers into that formula, and out will pop the answer.

Formula:                            Force = G (mA x mB) / (distance)²

If everything is in SI units, then        G = 6.67 x10⁻¹¹ newton-meter² / kilogram²

You said that
                         mA = 8.1 kg
                         mB = 6.5 kg
                 distance = 0.5 m .

   Force = (6.67 x 10⁻¹¹ nt-m²/kg²) (8.1kg x 6.5kg / (0.5m)² =

                (6.67 x 10⁻¹¹ nt-m²/kg²)    ( 52.65 kg² ) / (0.25 m²) =

                     1.4047 x 10⁻⁸ newtons .

That's roughly    5.052 x 10⁻⁸ ounce .  (5% of one micro-ounce)

Which layer of the Earth contains most of the Earth's mass?A.outer core
B.crust
C.inner core
D.mantle

Answers

The mantle is the layer of the Earth that contains most of the Earth's mass. The correct option is (D).

The part of the Earth's crust that contains the majority of its mass is called the mantle. Between the crust and the outer core, it is located. The mantle is made up of hot, flowing rock known as magma and is a thick, semi-solid layer. It makes up around 84% of the entire volume of the planet and is in charge of tectonic plate movement, volcanic activity, and other geological processes that sculpt the surface. In comparison to the mantle, the outer core and inner core have substantially smaller volumes.

Hence, the mantle is the layer of the Earth that contains most of the Earth's mass. The correct option is (D).

To learn more about Mantle, here:

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The "Mantle" is what contains most of earths mass.. So your correct answer is letter choice ( D ) .... 

Hope it Helped :) 
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