Which of these is evidence of global warning?
A) Rising global temperatures
B) An overall decrease in sea levels
C) Stable precipitation patterns
D) An increase in the size of glaciers

Answer:

22.  C.  Pz > Py > Px

23.  B.  5.0 × 10⁴Pa

24.  B.  Upward thrust exerted by the liquid

25.  B.  The volume of the object immersed in the liquid decreases

26.  D.  When a body is wholly or partially immersed it experiences upthrust equal to the weight of the fluid displaced

Explanation:

22. The more you go deeper into the sea, the more the pressure of the water increases pushing down on you.

The reason why salt water is very dense is that when the salt dissolves in the water, it adds to the mass of the water, which makes the water more denser.

Due to this, we can assume that the water pressure exerted on the fish will be greater beneath the sea than the lake at the same depth.

Answer:   C. Pz > Py > Px

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23.

Given:

Density of water = 1000 kg m⁻³

Atmospheric pressure at sea level, Patm = 1.0 × 10⁵ Pa]

Depth of water in sea = 5m

To find the pressure exerted by the water on the fish, we use the formula: P = hpg

P = pressure

h = height or depth of water

p = density of water

g = gravitational field strength

We are given the depth and density, but not the gravitational field strength

Gravitational Field Strength:  Measures how much gravity there is

And since we live on earth, the gravitational field strength is 10 N/kg

Depth, h = 5m

Density, ρ = 1000 kg/m³

Gravitational Field Strength, g = 10 N/kg

Now we substitute these into the formula:

P = hpg

P = (5)(1000)(10)

Multiply 5 and 1000 to get 5000

P = 5000 × 10

Multiply 5000 and 10 to get 50000

P = 50000Pa

      ↓                                                                                                                                                                                                      

P = 5.0 × 10⁴Pa

Answer:   B. 5.0 × 10⁴Pa

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24. When a body is fully or partly immersed in a liquid, it undergoes an apparent loss in its weight due to upward thrust exerted by the liquid.

The upward thrust is the same as the weight of the fluid being displaced by an object.

Answer:   B. Upward thrust exerted by the liquid

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25.

When you add common salt to water it becomes denser, which can increase the mass and volume of the water. Due to water becoming denser, it can make an object thats less dense float. Also, density and volume are inversely proportional to each other, meaning that when density increases, volume decreases.

Answer:   B. The volume of the object immersed in the liquid decreases.

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26.

Achimede's principle states that:

Answer:   D. When a body is wholly or partially immersed it experiences upthrust equal to the weight of the fluid displaced.

The efficiency of the engine through the four steps cycle is 83.4%.

The efficiency of a machine is the ratio of useful work done by the machine and the work done on the machine expressed as a percentage.

The efficiency of the engine is given by:

[tex]ɛ=\frac {W} {Q}[/tex]

where;

Since there at four steps in a cycle:

[tex]ɛ=\frac {W_1+ W_2+W_3+W_4} {Q_1+Q_2+Q_3+Q_4}[/tex]

The work done in the first step (isothermal expansion) is given by:

[tex]W_1=nRT_1\ln{\frac {V_2} { V_1}}[/tex]

where:

n= 1 mole, T1 = 402 K, V2 = 41.2 L, V1 = 18.5 L

Substituting the values:

[tex]W_1 = 1 × 8.314 × 402 \times ln{\frac {41.2} {18.5}} = 2676.01 J \\ [/tex]

Steps 2 and 4 are constant volume processes, therefore;

[tex]W_2=W_4=0[/tex]

The work done in the third step (isothermal expansion) is given by:

[tex]W_3=nRT_3\ln{\frac {V_4} { V_3}} [/tex]

where;

n = 1 mol, T3 = 273 K, V4 = 41.2 L, V3 = 18.5 L

Substituting the values:

[tex]W_3 = 1 × 8.314 × 273 \times ln{\frac {41.2} {18.5}} = 1817.29 J \\ [/tex]

[tex]W_3 = 1 × 8.314 × 273 \times ln{\frac {41.2} {18.5}} = 1817.29 J \\ [/tex]Heat enters the system only during steps (1) and (4).

The internal energy of the gas increases in step 4 but no work is done, while the internal energy is constant change in step 1 but work is done by the gas.

Thus;

[tex]Q_2=Q_3=0[/tex]

The heat that enters the system during the isothermal expansion is given by:

[tex]Q_1=W_1[/tex]

The heat that enters the system on step 4 at constant volume is given by:

[tex]Q_4=C_V(T_4-T_3)[/tex]

where:

Cv =21 J/K, T3 = 273 K, T4 = 402 K

Substituting the values:

[tex]Q_4= 21 × (402 - 273) = 2709 \: J[/tex]

Solving for efficiency, ɛ:

[tex]ɛ=\frac {2676.01+ 0+0+1817.29} {2676.01+0+0+2709} = 83.4\%[/tex]

Therefore, the efficiency of the engine is 83.4%.

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Answer:

about 3 days

It takes about 3 days for a spacecraft to reach the Moon. During that time a spacecraft travels at least 240,000 miles (386,400 kilometers) which is the distance between Earth and the Moon. The specific distance depends on the specific path chosen.

Explanation:

no explanation

A physical balance is simply a weight measuring instrument. It is used to measure the weight of any unknown object with the help of the other object with known weight.

Explanation:

Answer:

Slick and smooth surfaces mediate friction to a low, allowing an object to speed across it with low resistance.

Explanation:

The process which involves plants to cause weathering to a seed that falls into a crack in a rock therefore, breaking apart the rock is called Mechanical weathering.

This is defined as the set of weathering processes that break apart rocks into particles (sediment) through physical processes. The most common form of mechanical weathering is the freeze-thaw cycle. Water seeps into holes and cracks in rocks then the water freezes and expands, therefore making the holes larger eventually making the rock split apart.

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Answer:

root-pry

Explanation:

i took the test

Answer:

The planets and moons.

Explanation:

Planets follow an elliptical path around the sun (kinda oval shaped). Moons do the same to planets.

Answer:

600-750

Explanation:

The red color in the visible region lies in the wavelength of 600 – 750 nm. The visible light spectrum is the fraction of the spectrum that is visible to humans.

The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.

The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.

The length of a wave is measured in its propagation direction. The wavelength is measured in meters, centimeters, nanometers, and other units since it is a distance measurement.

The portion of the spectrum visible to the human light is known as the visible light Spectrum.

Visible light has a range of wavelengths from about 400-750 nm. The red color in the visible region lies in the wavelength of 600 – 750 nm.

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Answer:

variable that doesnt change

Explanation:

contolled variable is that variable that does not change throughout the course of the experiment

Answer:

my answer to that question was c

Explanation:

The expression which one would use to calculate the distance to the star is distance = sq. root. of (luminosity/4pi*apparent brightness)

This is a scalar quantity and refers to how much ground a body has covered.

In a situation where parameters such as luminosity of a star and measured its apparent brightness are known then the distance to the star will be:

Distance= √(luminosity/4pi*apparent brightness)

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The coulombs of charge which are flowing into the house is 400 coulombs.

This is the physical property of matter that causes it to experience a force when placed in an electromagnetic field and its unit is Coulomb.

Electric charge(Q) = It where I is current and t is time

Q = It

 = 200A × 2s

 = 400 coulombs

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Required answer :-

Given :-

We know that,

↠ W = P × t

↠ W = V × I × t

↠ W = V × Q/t × t

↠ W = V × Q

On substituting values, we get

↠ 40 = 20 × Q

↠ Q = 40/20

↠ Q = 2 c

↠ ne = q

↠ n = q/e

↠ n = 2/ 1.6 × 10^- 19

↠ n = 1.25 × 10^19

Hence,

Explanation:

do we can say that the first step is finding the acceleration of the object. We do so by saying F = ma

so a = F/m

a = 500 m/s^2

we now have the time, acceleration and initial velocity.

so we can find the final velocity by using one of newtons equations which is: vf = vi + at

so:

vf = 0 + 500 × 12

vf = 6000

note that our initial velocity was zero since the object was initially at rest.

if you still have any doubt dont hesitate to ask for further help.

Answer:

hope this he;ps

Explanation:

power = work ÷ time

time = work ÷ power

time = 5,000 J ÷ 100 W

time = 50 s

Spend time on this subject. Physics may have some concepts which are difficult for students to understand in some cases. A key example is electricity and magnetism. Spend extra time on topics you find difficult and most of all, remember to do PAST PAPERS. These will be your light in the dark, your teachers, your friends. Continue to do them, and remember to leave one unsolved before your examinations. This will orient your mind for the examination and let you achieve the maximum marks possible.

Explanation:

dc stands for direct current it won't hurt u if u get in contact with dc but ac will be threatening to life

si unit is same as in ac (alternate current) and it is ampere or amp

what unit of the energy does a power company charge a consumer for

Answer:

microwave ovens are better for crispy foods microwaves are better for re heating food or microwave food

Explanation:

Explanation:

1) D.

the other answer options don't make any sense in that regard. these 2 forms of energy represent in total mechanical energy.

2) C. Chemistry

3) D. Atoms.

although, protons and neutrons are part of them.

4) B. Input force

5) B. False

friction causes energy to be diverted to doing unwanted and unnecessary things, like creating heat instead of movement.

[tex]\bold{Heya!}[/tex]

(b) comb induces a net dipole moment opposite to the direction of field.

When a comb rubbed with dry hair it's attracts pieces of piece of paper. This is because the comb that induces of the dipole net that of the moment thatopposite of the field. And, This happens the field dueing to charge of the comb induces of the dipole moment in the paper of the molecules in the dielectric.

Hopefully This Helps ! ~

#LearnWithBrainly

[tex]\underline{Answer :}[/tex]

Jaceysan ~

Answer:

Option B

Explanation:

When a comb is rubbed with dry hair it induces some charge or its get charged either positive or negative

As paper remains in neutral hence it attracts the paper

Hence option B is correct

Answer:

Solution s =ut + ½ at 2 = 0×10 + ½ × 10×10 2 = 1000/2=500 m

Explanation:

The body is accelerating from stationary to a velocity of 100 m/s within 10 seconds. Thus, the distance covered is 500 m.

Acceleration of a moving body is the rate of change in its velocity. Acceleration is a vector quantity having both magnitude and direction. The change in magnitude or direction or both in velocity causes an acceleration in the moving body.

The relation between distance with the velocity, acceleration and time is given as :

s = ut + 1/2 at²

The initial velocity u = 0 here

v = 100 m/s

t = 10 seconds.

acceleration =  100 /10 = 10 m/s²

Then the distance covered is calculated as follows:

s = 1/2 at²

  = 1/2 10 m/s²× 10²

  = 500 m

Therefore, the distance covered by the body is 500 m.

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Answer:

PE is related to the ability to do work, If an item is sitting on  a shelf

it has potential energy relative to its position on the floor, However, if the object were to fall it would hit the floor with a KE equal to the PE that it had sitting on the shelf.

Sounds are caused by compressional waves in  the air - when a piano key is struck or a TV is turned on, then compressional waves are produced in the surrounding air due to a disturbance. The human ear recognizes the disturbed air as due to the object that created the disturbance.

The law of physics that this scenario would violate is the law of conservation of energy.

The law of conservation of energy states that energy possessed by an object or physical body can neither be created nor destroyed but can only be transformed from one form to another.

This ultimately implies that, the energy possessed by the rock at the beginning must be equal to the energy possessed by the rock at the end in accordance with the law of conservation of energy.

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E-books have made it easier to carry books across long distances and have made learning  simpler.

In the twenty first century, we have seen a sudden budding of technology  such as have never been. Part of this mordern technology is the introduction of electronic books in several formats such as pdf, epub etc.

These books can be read on computers, ipads, laptops, sart phone etc having the appropriate reader software. These ebooks unlike the paper books have eased the inconvienence associated with carrying  paper books which are often bulky from place to place.

Several ebooks could be housed at once in a  smartphone and carried in the pocket. This has made learning easier than ever. Thus, ebooks are better than paper books.

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The prediction should the expect to occur will be C₂ attracts B₂. This is due to the fact that like charges repel while the unlike charges attract each other.

A magnet is an iron piece or of other material with its constituent atoms arranged in such a way that it shows magnetism qualities,

Like charge attracting different iron-containing objects or engaging itself in a magnetic field.

The given metallic bars are A, B, and C. Every end of the magnet is denoted with the 1 and 2.

The denotation to the magnet is given as;

A₁A₂

B₁B₂

C₁C₂

He places the end of one bar close to an end of a second bar. The end of magnets C₂ and B₂ are of unlike charges. As we know that the unlike charges attract each other.

So that the C₂ and B₂ due to the unlike charge ends attract each other.

Hence the prediction should the expected to occur will be C₂ attracts B₂

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Answer:

b

Explanation:

so you dont have to read the long one