PHYSICS MIDDLE SCHOOL

Find the density of an unknown liquid in a beaker. The empty beaker's mass is 165 grams. With the unknown liquid inside the beaker, the total mass is 309 grams. The
volume of the unknown liquid is 125mL. Is the liquid pure water? Explain your answer.

Answers

Answer 1
Answer: Density = mass / volume

So in order calculate the density of the unknown liquid, we need to know
its mass and its volume.

If the mass of the beaker is  165 grams  empty and  309 grams with
something in it, then the mass of the stuff in it must be

(309 - 165) = 144 grams.

The question tells us that its volume is  125 mL  (same as 125 cm³),
so we have everything we need.

Density = mass/volume = 144/125 = 1.152 grams per cm³ .

The density of pure water is  1.000 gram per cm³ , so the unknown liquid
is definitely not pure water.

The density of this unknown liquid is  15.2%  more than that of pure water.
Even if water had a huge amount of pollution and junk in it, its density
would probably not be that much greater than 1.000 .  So the unknown
liquid is probably not polluted water either.
Answer 2
Answer: Density is defined as mass divided by volume.  SO we have to find the mass of unknown liquid first and then divide by its volume.

Mass of the liquid =  total mass of beaker and liquid inside the beaker - 
                                                                                        mass of empty beaker
               = 309 grams - 165 grams 
               = 144 grams

volume of unknown liquid = 125 ml    given

Density =  mass / volume  =  144 / 125  = 1.152 gm / ml

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Which one of the following is not a safety rule in the laboratory. a. To sit on a stool
b. To follow instructions
c. To wear shoes with hard soles
d. Handling apparatus​

Answers

Answer:

C. To wear shoes with hard soles​

Explanation:

Which is the force that slows a book sliding ona table

Answers

friction is the force. Friction is also what makes the heat when you rub your hands together really fast for a while, and without it, if you started running in an open field and then tried to stop, you would just keep going on forever until you collided with something
The force that slowed the book from sliding on a table is friction, friction is a type of force that causes things to slow down. In this the book slowed down because of friction.

Near the surface of the earth the acceleration do to gravity is equal to......?

Answers


That's 9.8 meters/second² .

Anything that falls to the ground, no matter whether it's a feather
or a battleship, falls with that same acceleration.  At least it would
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Where are most faults located? And what is a fault in science terms?

Answers

You can almost ALWAYS find a fault at the edge of a boundary or between the earths' surface and the fault plane. A fault in scientific terms is basically just a crack in the earth's surface that has movement among the fault.

Earth has a mass of 5.97 x 1024kg, and a mean radius of 6.38 x 10m. What would be the orbitasatellite in orbit 1.44 x 108 m above Earth?
a. v, = 630m/s,
c. v, - 1630m/s,
T = 2.78 x 10 s
T=5.78 x 10s
b. V = 1820m/s,
d. V, - 1260m/s,
T = 6.78 x 106 s
T=5.78 x 10's
Please select the best answer from the choices provid​

Answers

Answer:

v = 1630 m/s

T = 5.78 x 10^5 s

Explanation:

The tangential speed of the satellite can be found by requiring that the gravitational force on the satellite is equal to the centripetal force:

G(Mm)/((R+h)^2)=m(v^2)/(R+h)

where

G is the gravitational constant

M=5.97 x 1024kg is the Earth's mass

m is the satellite's mass

R=6.38 \cdot 10^6 m is the Earth's radius

h=1.44\cdot 10^8 m is the altitude of the satellite

v is the speed of the satellite

Solving for v,

v=\sqrt{(GM)/(R+h)}=\sqrt{((6.67\cdot 10^(-11))(5.97\cdot 10^(24)kg))/(6.38\cdot 10^6 m+1.44\cdot 10^8 m)}=1627 m/s \sim 1630 m/s

And the period of the orbit is equal to the ratio between the distance covered during one revolution (the circumference of the orbit) and the speed:

T=(2 \pi (R+h))/(v)=(2\pi (6.38\cdot 10^6 m+1.44\cdot 10^8 m))/(1630 m/s)=5.79\cdot 10^5 s

So the correct answer is

v = 1630 m/s

T = 5.78 x 10^5 s

Explain why the air we breathe and solids, such as steel and bronze, are solutions or homogeneous mixtures, just like salt water is ?

Answers

Answer:

Explanation:

There are two major types of mixtures; homogeneous and heterogeneous mixtures.

Homogeneous mixture is a mixture in which its constituent particles are evenly distributed throughout the mixture. Examples are steel, bronze and air (as stated in the question). While heterogeneous mixture is a mixture in which it's constituent particles are not evenly distributed throughout the mixture. Example includes sand and water solution.

Salt water is an homogeneous mixture because the percentage of salt in a sample of salt from a particular mixture is the same in every other sample (of the same volume) of the same mixture.

From the above, we can deduce that air is an homogeneous mixture because a sample of air (in a particular area) will contain the same constituent by proportion as another sample of air (in the same area). This means that the percentage of oxygen, nitrogen, carbon dioxide, water vapour, argon and other substances in one sample of the air will be equal to the percentage of this constituents in the other sample of the air.

Same can be said about steel and bronze. For steel, each gram of the same steel will contain the same percentage of carbon and iron. And also, each gram of the same bronze will contain the same percentage of copper, tin and other metals present.

For better understanding, let's consider an heterogeneous mixture. A mixture of sand and water solution cannot have the same proportion throughout, this is because sand particles in some samples (of a particular volume) of a particular mixture will be different from sand particles in some other samples (of the same volume) of the same mixture.

Because you can't physically see the difference.
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