Please help I will mark brainliest

If the fish is considered as the system, it is an open system

All living things are an open system, since there is a constant exchange of energy and matter with the environment. In this case the fish moves and breathes which will result in a work on the environment.

Thermodynamic analysis is used to study the nature's most diversified energy change. Some of the methods of Thermodynamic analysis are pinch analysis, exergy analysis, second law analysis, and equipartition principles.

Therefore,  if the fish is considered as the system, it is an open system

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The minimum heat required is 129.7KJ.

Given

Mass of water (m) = 50g

Initial temperature [tex]T_{i}[/tex] = 20°C

Final temperature [tex]T_{f}[/tex] = 100°C

Specific heat of water =4190 J/kg-k

The heat of vaporization (L) = 22.6 × 10 5 j/kg .

The heat required = Heat required to raise water temperature from 20 to 100 + Heat to vapourize water thoroughly.

Q=mc([tex]T_{f} - T_{i}[/tex]) + mL

Q=0.05 * 4190 (100-20) + 0.05 * 22.6 × [tex]10^{5}[/tex]

Q=(0.16760 + 1.13)× [tex]10^{5}[/tex]

Q=1.2976 × [tex]10^{5}[/tex]

  = 129.7KJ

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The observation is due to heat transfer from the stearic acid to the water, and as a result, the temperature of the stearic acid falls, and it solidifies whereas the temperature of the water rises.

Heat transfer is the process by which heat energy moves from one body or object to another.

Heat is transferred from a hotter to a colder object.

There are three major processes of heat transfer, they are:

Conduction is a for of heat transfer which occurs without actual movement of the molecules, but as result of the vibration of the particles thereby transferring energy from one molecule or particle to the next.

Considering the observation above:

A boiling tube containing liquid stearic acid which has a melting point of 69°C is placed into an insulated cup of water as the stearic acid solidifies the temperature of the water rises.

The given observation is because heat has been transferred from the stearic acid to water. Thus, the temperature of the stearic acid falls, and it solidifies whereas the temperature of the water rises.

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Answer:

Hazard

Explanation:

A hazard is a source or a situation with the potential for harm in terms of human injury or ill-health, damage to property, damage to the environment, or a combination of these.

Answer:

A hiker drops a heavy stone over a cliff and hear it strike the cliff base 2.8seconds after dropping it.

When t is 1.5 seconds displacement of the object is 0.41 m.

Displacement of an object is defined as the shortest path covered by an object. It can be represented in the units centimeters and meters.

The object's time of simple harmonic motion is T.

T = 2 seconds

The object's amplitude simple harmonic motion is a.

a = 0.5 m

Displacement of the object is maximum when t = 0.

The displacement of the object is y.

When t is 1.5 seconds displacement of the object is,

[tex]y = a \: sin( \frac{2\pi}{T} )t[/tex]

[tex]y = 0.5\: sin( \frac{2\pi}{2} ) \times 1.5[/tex]

[tex]y = a \: sin( \pi \: 1.5)[/tex]

y = 0.41 m

Therefore, when t is 1.5 seconds displacement of the object is 0.41 m.

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The acceleration of an airplane that had an initial velocity of 10km/min and a final velocity of 18km/min covered over 90min is 0.09km/min².

The acceleration of a moving substance can be calculated by dividing the change in velocity by the time taken as follows:

a = (v - u)/t

Where;

According to this question, an airplane was flying from Cincinnati to Denver. The velocity of an airplane was measured shortly after take off at 10km/min. The velocity was measured again mid-flight to be 18km/min.

a = (18km/min - 10km/min)/90min

a = 8km/min ÷ 90min

a = 0.09km/min²

Therefore, acceleration of an airplane that had an initial velocity of 10km/min and a final velocity of 18km/min covered over 90min is 0.09km/min².

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675g/cm³ is the density of the liquid

Here we have given that

density of wood be ρ.

the volume of the block be V          

The volume of the block =1/4 v

The volume of the immersed block (v) =V-1/4V=3/4V

We know the weight of the block = the weight of the water displaced by the submerged part of the block.

i.e. V x ρ x g    

= 3/4 x900g/cm³                            

= 675g/cm³

Density is a measure of mass divided by the volume of an object. Defined as mass per unit volume. here from the above equation we have substituted the given value and  we got the answer as 675g/cm³

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Answer:

John Dalton

Explanation:

Answer:

chemist John Dalton

Explanation:

:)

Two oxygen atoms would share the negative charge.

There are some compounds in which a single structure is insufficient to explain the properties of the compound. In that case, we have to involve a number of other structures which contributes to the overall structure of the molecule to different extents.

The arrows are used to show the transformation of the structures of the compounds. Looking at the structures as it has been shown here, we know that the oxygen atoms that would be involved in the resonance are the oxygen atoms that are in the conjugated system.

There are two oxygen atoms in the conjugated system hence they will share the  negative charge.

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The correct realistic problem for the given equation is problem 1 in which the electric field strength of the disc is half its value at the center of the disk.

We know that,

Electric field of a charged disc at a distance along its axis is given by,

E = σ / 2 ε ( 1 - x / √ ( [tex]x^{2}[/tex] + [tex]r^{2}[/tex] ) )

Electric field at the centre of a charged disc is given by,

[tex]E_{c}[/tex] = σ / 2 ε ( Since at centre, x = 0 )

Distance along the axis of a charged disk, where electric field strength's value is half its value at the center of the disk.

[tex]E_{x}[/tex] = [tex]E_{c}[/tex] / 2

σ / 2 ε ( 1 - x / √ ( [tex]x^{2}[/tex] + [tex]r^{2}[/tex] ) ) =  ( σ / 2 ε ) / 2

x / √ ( [tex]x^{2}[/tex] + [tex]r^{2}[/tex] ) = 1 / 2

4 [tex]x^{2}[/tex] = [tex]x^{2}[/tex] + [tex]r^{2}[/tex]

3 [tex]x^{2}[/tex] = [tex]r^{2}[/tex]

x = r / √ 3 ,which is the correct distance, when magnitude is half its value from centre.

Electric field is a field that surrounds electrically charged particles that exerts force on other charged particles in the field.

Therefore, the given equation is suitable for Electric field of a charged disc at a distance along its axis where electric field strength's value is half its value at the center of the disk.

The given question is incomplete. The completed question is

You are given the following equation to solve a problem:

σ / 2 ε ( 1 - x / √ ( [tex]x^{2}[/tex] + [tex]r^{2}[/tex] ) ) = [tex]E_{c}[/tex] = σ / 2 ε

Choose the most realistic problem for which this could be the correct equation.

1 ) At what distance along the axis of a charged disk is the electric field strength half its value at the center of the disk? Give your answer in terms of the disk's radius R.

2 ) At what distance along the axis of a charged disk is the electric field strength double its value at the center of the disk? Give your answer in terms of the disk's radius R.

3 ) At what distance along the axis of a charged square is the electric field strength double its value at the center of the square? Give your answer in terms of the square's side R.

4 ) At what distance along the axis of a charged square is the electric field strength half its value at the center of the square? Give your answer in terms of the square's side R.

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Answer:

Choice C

Explanation:

In any programming language, the variable cannot be in quotes.

Many languages regard a string as literal if it is surrounded by a single quote rather than a double quote. Any computer language prohibits putting quotations around a variable. Thus, option C is correct.

Only letters (including uppercase and lowercase characters), numbers, and underscore are permitted in variable names.

A variable's first letter must either be a letter or an underscore. There is no restriction on the length of a variable name or identifier.

Usually, an experiment contains independent, dependent, and controlled variables.

Therefore, A variable in programming is a value that can change based on external factors or data that has been supplied to the program.

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Using the equations of kinematics, we obtain the following results;

The maximum height is the height that was attained by the projectile. In this case, we have the fact that the projectile was fired vertically upwards with a speed of 34.0m/s. On the descent, the cannonball lands on top of a 30.0m tall building.

1) The maximum height could be obtained from;

v^2 = u^2 -2gh

v = final velocity ( 0 m/s at the maximum height)

u = initial velocity = 34.0m/s

g = acceleration due to gravity = 9.8 m/s^2

h = maximum height attained

Since v = 0 m/s

u^2 = 2gh

h = u^2/2g

h = (34)^2/ 2 * 9.8

h = 1156/19.6

h = 59 m

2) Given that the distance covered from the maximum height to the top of the building = 59 m - 30 m = 29 m

v^2 = u^2 + 2gh

In this case, the initial velocity is zero because the cannonballs dropped from a height

v^2 = 2gh

v = √2gh

v = √2 * 9.8 * 29

v = 24 m/s

Given that;

v = u - gt

v = 0 m/s when the cannon ball is projected upwards;

u = gt

t = u/g

t = 34.0m/s/9.8 m/s^2

t = 3.5 secs

The total time spent in air = 2(3.5 secs) = 7 secs

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The cheetah that can go from a state of resting to running at 20 m/s in just 2 seconds has an average acceleration of: 10 m/s²

The formulas for uniformly varied rectilinear motion (UVRM) and procedures we will use to solve this exercise are:

a = (vf - vi) /t

Where:

Information about the problem:

Applying the acceleration formula we have:

a = (vf - vi) /t

a = (20 m/s - 0 m/s) /2 s

a = (20 m/s) /2 s

a =  10 m/s²

It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2

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Answer:

See below

Explanation:

d = 1/2 a t^2

1.226 = 1/2 a (.5)^2

a = 1.226/(1/2 * .5^2)

a = 9.808 m/s^2

A researcher tests acceleration due to gravity then the acceleration due to gravity measured by the researcher is 9.808 m/s².

In mechanics, acceleration refers to the speed at which an object's velocity varies over time. how many accelerations each vector has. An object's acceleration is determined by the direction of the net force exerted on it.

Due to the fact that it has both a magnitude and a direction, acceleration is a vector quantity. Velocity is a different vector property.

According to the question,

Time, t = 0.5 seconds

Distance, s = 1.226 meters

s = 1/2 a t²

1.226 = 1/2 a (0.5)²

a = 1.226 / (1/2 *0.5²)

a = 9.808 m/s²

So, the acceleration due to gravity is 9.808 m/s².

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The correct answer is 441 N.

The force that pulls objects toward the centre of the Earth is known as earth gravity. The acceleration of all the bodies that are affected by gravity is almost equal to the strength of the gravitational field.

The force exerted on an object by gravity is known as the weight of a body.

As a result, we can state that weight is only a force.

Given that the mass of a person on earth is = 45 kg

and that gravity's acceleration on earth is = 9.8 ms^2.

Weight, then, is defined as mass multiplied by the gravitational acceleration, or W = m × g.

W = 45 × 9.8

W = 441 N

Hence, the total weight on Earth will be 441 Newton.

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Answer: A gram of gold is worth about $25, so 2 grams or better would be viewed as high-grade for bulk tonnage mining.

Explanation:

i looked it up.

The size of the object is 200 micrometers.

Size of the object = (Diameter of the field of view) / Fit number

Field of view of high power magnification 400X = 0.40mm

Fit number = 2  (object fills ½ of the field of view )

Size of the object = 0.40 / 2 = 0.2mm = 200 micrometer.

Work is completed at a rate determined by power. The Watt is the common metric unit of power. A unit of power is adequate for one unit of work divided by one unit of time, as suggested by the facility equation. As a result, one Watt is adequate for one Joule/second. The term "horsepower" is occasionally wont to describe a machine's output of power for historical reasons. The equivalence of horsepower is roughly 750 Watts.  a person is a machine,  a bit like a machine with a power rating. Some people possess greater strength than others. In other words, some people have the power to accomplish the same amount of work in the same amount of time or in less time.

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Answer:

Acceleration due to gravity = g = 9.8 m/s²

Time to reach ground = t = 6 sec

Initial Velocity of the Rock = Vi = 0 m/s (Because, the rock will be at rest, initially)

Hope this answer helps you out!

Answer:

The refractor telescope has many advantages and disadvantages. One of the disadvantages is that the lenses are made of glasses therefore it has to be perfect with no air bubbles or scratches in the glass as this will impair the users viewing. Another disadvantage is that lense are weakest around the edges because they are thinnest there and that is the only place they are being supported by the telescope so this can lead to easy breakage. The lense can have colour distortion which means when white light goes through the lense it is split into colours. Since violet right is refracted more than red, the violet is brought to a focus clearer and this will make the image coloured and blurred, this is called chromatic aberration. Some advantages of refractor telescopes is that refractor telescopes are rugged meaning it is more resistant to misalignment than the reflector telescopes after their initial alignment. The glass surfaces don’t really need cleaning because it is sealed from the atmosphere this is efficient! The images are sharper, steadier and better than a reflector telescope because the tube is closed off from the outside and there will be no effects of changing temperatures or air currents. The focal length of a lense is proportional to the size of the image that is produced. Therefore if the focal length is longer the image will be larger. How bright an image will be also depends on how much light is collected by the telescope.

The block of material with a density of 1020 kg/m³ when placed into pure water will sink.

The Density of an object is the ratio of the mass and volume of the object.

The density of an object measure how compact the particles of an object are.

Dense objects have particles that are tightly packed together whereas less dense objects have particles that are less tightly packed together.

A denser solid will sink in a less dense liquid.

A less dense solid will float in a denser liquid,

Comparing the densities of the solid object and the density of water.

The block of material has a greater density than water. Hence, the block of material will sink in water.

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Answer:

1.11111 century mother duck

Answer: TRUE

Explanation:

Answer:

SImple machine:A machine with few or no moving parts that is used to make work easier.

Example: Wedge, inclined plane, screw, etc.

Complex machine: A machine that is a combination of two or more simple machines.

Example: Car, refrigerator, sewing machine, etc.

Explanation:

Answer:

a simple machine is a machine with few or no moving parts that is used to make work easier, such as a wedge or screw. a complex machine is a combination of two or more simple machines, such as a car, sewing machine or refrigerator.

Explanation:

As we know velocity is the rate of change of position with respect to time.

Mathematically  [tex]Velocity = \frac{Position}{Time}[/tex]

Also, in a position-time graph, the velocity of a moving object can be represented by the slope of the graph i.e. Tan[tex]\alpha[/tex].

[tex]\alpha[/tex] is the angle made by the slope by the horizontal X-axis.

Distance travelled by the object is recorded on the Y-axis and time taken to complete that particular distance is noted on X-axis.

[tex]Tan\alpha = \frac{Position}{Time}[/tex]

[tex]Tan\alpha = Velocity = \frac{x}{t}[/tex]

According to the graph

for x = 8m, t = 2s

[tex]Tan \alpha = \frac{8}{2}[/tex] = 4 m/s

for x = 12m, t = 3s

[tex]Tan\alpha = \frac{12}{3}[/tex] = 4 m/s

Therefore for every change in distance, the time changes linearly which gives constant velocity as 4m/s.

Option (d) 4 m/s

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Since an object's instantaneous velocity equals the derivative of its displacement at a certain point, we can also state that the instantaneous velocity at time t = 1 is around 2 meters per second.

The derivative of x with respect to t, or the upper limit of the average velocity as the elapsed time approaches 0, is the instantaneous velocity of an object:

v (t) equals d d t x (t). v (t) equals d d t x (t).

Instantaneous velocity is a vector having a dimension of length per time, similar to average velocity. The speed of an object at a specific time is its instantaneous speed. The instantaneous velocity is obtained by adding the direction to the speed.

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A control is the standard by which test variables can be compared.

An experiment is a test under controlled conditions made to either demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy of something previously untried.

In an experiment, controlling an experiment means designing an experiment so that the effects of one or more variables are reduced or eliminated.

A control is a separate group or subject in an experiment against which the results are compared.

Therefore, it can be said that a control is the standard by which test variables can be compared.

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Answer: Volume=0.030/0.75

Explanation:

Density= mass/volume ∆density= mass/volume

(1.29- 0.54)= 0.030/volume

0.75 volume= 0.030 Volume=0.030/0.75

The possible values lie between 0 to 10. The transformed numeric value can be 10.

The skewed features need to be transformed in order to make them regularly distributed. With square root, cube root, and logarithm transformation, right-skewed features can be made normal.

Choose the cells that have text-based numbers recorded in them. Then Click Paste > Paste Special on the Home tab. After selecting Multiply, select OK.

Excel multiplies each cell by 1, converting the text to numbers in the process.

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Electrons, like all other matter, exhibit the dual behavior of both particles and waves. Since electrons travel like waves, their energy is restricted to a certain energy level, each of which is associated with a specific wavelength.

Wave-particle duality is the idea that matter and energy have characteristics that are typical of both waves and particles. Depending on the circumstances, the matter may be seen as a wave or a particle.

Objects with huge masses, like baseball, have such small wavelengths that they are best regarded as particles. On the other hand,  objects with small masses, like photons, have huge wavelengths and are best regarded as waves. However, objects with intermediate masses, like electrons, have characteristics of both particles and waves.

As a result, in 1924 de Broglie hypothesized that a particle like an electron may be characterized by a wave. Since electrons are waves, their energy is limited to specific energy levels, each of which corresponds to a given wavelength which is given by

[tex]\lambda =\dfrac{h}{mv}[/tex]

Where h ⇒Planck’s constant,

m  ⇒ mass of the particle

v  ⇒ velocity of the particle

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Fill in the blank:

Electrons, like all other matter, exhibit the dual behavior of both         and                     Since electrons travel like waves, their energy is restricted to a certain energy        , each of which is associated with a specific wavelength.