Tính nhiệt lượng cần cung cấp để đun nóng 5kg nước từ nhiệt độ 25 độ C lên 100 độ C. Biết nhiệt dung riêng của nước là 4,18.10^3 J/kg.K

The human population which grows by about 2 percent each year, is showing linear growth.

A linear increment occurs when a sequence increases gradually with a constant value.

If a population increases at the rate of 2%, the incremental rate or constant factor is 2%, thus, we can conclude that the human population which grows by about 2 percent each year, is showing linear growth.

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At hmax, Vy=0

vy=v0y-gt

0=6.32sin(36.3)-9.81t

t=.381 seconds

Δy=v0yt-.5gt^2

Δy=6.32sin(36.3)*.381-.5(9.81)(.381)^2

maximum height=.714 m

The magnetic force on the proton is F = -e vx By k. The numerical value of F is 1.2 × \(10^{-15\) N. The force is in the -k direction, which means it is directed downward perpendicular to the plane containing the velocity and magnetic field vectors.

Part (a) - The magnetic force F on a charged particle moving through a magnetic field is given by the equation:

F = q(v x B)

For a proton with charge e and velocity v = vx i + vy j, and a magnetic field B = By j, we have:

F = e(v x B) = e[(vx i + vy j) x (By j)]

Taking the cross product of the velocity and magnetic field vectors:

(v x B) = (vx i + vy j) x (By j)

= (vx By) i x j + (vy By) j x j

= -vx By k

where i, j, and k are the unit vectors in the x, y, and z directions, respectively.

Substituting this into the expression for the magnetic force, we get:

F = e(v x B) = -evxBy k

Therefore, the magnetic force on the proton is F = -e vx By k.

Part (b) - Expressing the magnitude of the force, IFI, in terms of e, vx, vy, and By:

The magnitude of the magnetic force on a charged particle is given by:

|F| = q|v||B| sin(θ)

where θ is the angle between v and B.

In this case, the angle between v and B is 90 degrees, so sin(θ) = 1. Therefore:

|F| = e|v||B|

Substituting in the given values, we get:

|F| = e √(vx² + vy²) |By| = e √(71² + 66²) (7.1) = 2.34 × \(10^{-16\) N

Part (c) - Calculating the numerical value of F in N:

Substituting the given values into the expression for the magnetic force, we get:

F = -e vx By k = -1.6 × \(10^{-19\) C × 71 m/s × 7.1 T k = -1.2 × \(10^{-15\) N k

Therefore, the numerical value of F is 1.2 × \(10^{-15\) N.

Part (d) - Determining the direction of the force:

The force is in the -k direction, which means it is directed downward perpendicular to the plane containing the velocity and magnetic field vectors.

Magnetic force is the force exerted by a magnetic field on a moving charge or a magnet. It is one of the fundamental forces of nature and is responsible for many phenomena that we observe in our everyday lives, such as the behavior of compasses and the attraction and repulsion of magnets.

The strength of the magnetic force depends on the strength of the magnetic field and the velocity of the moving charge or magnet. The direction of the force is perpendicular to both the magnetic field and the direction of motion of the charged particle. The magnetic force has many important applications in technology, such as in electric motors, generators, and magnetic resonance imaging (MRI) machines. It is also used in particle accelerators to manipulate and control the motion of charged particles.

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The speed increases but acceleration decreases.

In mechanics, acceleration is the price of change of the velocity of an object with respect to time. Accelerations are vector quantities. The orientation of an item's acceleration is given by means of the orientation of the net force performing on that object.

Acceleration is, rate at which pace modifications with time, in phrases of each speed and direction. A point or an item transferring in a direct line is increased if it hurries up or slows down. motion on a circle is multiplied even supposing the speed is regular, due to the fact the path is constantly changing.

Acceleration. pace is the fee of alternate of displacement. Acceleration is the charge of change of pace. speed is a vector quantity as it includes both value and course. Acceleration is also a vector amount as it's far simply the rate of trade of velocity.

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Since the drag force is proportional to the square of speed,  to improve your car’s gas mileage, you should drive in lower speed.

The drag force is a force experienced by an object when it is moving through a fluid. The fluid can be air, water, gas or liquid.

Some of the factors that affect the drag force are the speed of the object and its aerodynamic. The relation between drag force and velocity is given by:

F = 1/2 . CρAv²

Where:

C = drag coefficient

ρ = fluid density

A = area of the object that facing the fluid

v = velocity

Therefore, the drag force is directly proportional to the square of object's velocity, or

F ∝ v²

The power of car should overcome this drag force. The relation between power and force is given by:

P = F . v

Since F is proportional to v², then

P ∝ v³

Thus, we can conclude to use less power, which means to improve gas mileage, you should drive in lower speed.

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Answer: the answers would be both of the ones in the middle

Explanation:

the one where it says plant more trees

and the other one that says paint ore cover black asphalt streets

An electrical impulse travel through a nerve cell by dendrites to the cell body.

The fundamental functional unit of the nervous system, the neuron, is in charge of receiving, carrying, and transmitting nerve impulses.

The dendrites of the neurons receive the electrical impulses.

These electrical impulses are sent from the dendrites to the cell body where they originate.

The axon carries the impulses from the cell body to the axonal end after receiving them.

The adult human brain is estimated to have 86 billion nerve cells, also known as neurons, which are the basic functioning components of the nervous system. A nerve cell's function is to receive information from other cells and convey it to other cells. In the human body, there are three basic types of nerve cells that work together to sense and analyze information about our surroundings before evoking reactions to these stimuli.

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The average force on the puck by the stick is 448 N

To find the average force on the hockey puck, we can use the impulse-momentum theorem:

Impulse = Change in momentum

The impulse on the puck can be calculated as:

Impulse = mass x change in velocity
Impulse = 0.16 kg x (9 m/s - (-5 m/s))
Impulse = 0.16 kg x 14 m/s
Impulse = 2.24 N*s

The change in velocity is negative because the puck is moving in the opposite direction after the impact.

The impulse on the puck is equal to the average force multiplied by the time of contact:

Impulse = average force x time
2.24 N*s = average force x 0.005 s
average force = 2.24 N*s / 0.005 s
average force = 448 N

Therefore, the average force is 448 N.

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Answer:

Janaki temple and Pashupatinath Temple are found in Nepal. These structures are religious and they increase the pride of the country through tourism. These temples are important in the country and are mostly visited by tourists.

This also helps to bring in income for the country and also helps by attracting many visitors and a corresponding development of its tourism industry.

The final angular speed will be 194 rpm.

From the statement:

force = 5 N

mass of the stone = 30 kg

diameter of the stone = 30 cm = 0.30 m

the radius of the stone will be = 0.15 m

initial angular velocity = 200rpm

coefficient of kinetic friction = 0.3

time for which knife kept on stone = 10 s

moment of inertia (I) = 0.5mr² (considering the stone as a solid ring )

                                  = 0.5 (30 × (0.15)²)

                                   = 15 × 0.0225

                                    = 0.3375 kgm²

Now ,we know that

torque = I α

Also torque = F x r       (r = perpendicular distance )

here force will be μF = 0.3F

therefore ,

Iα = μF × r

0.5 (30 × (0.15)²) × α = 0.3 × 5 × 0.15

∴ α = 0.6

the value of acceleration will be negative as the wheel is slowing down

∴ α =  - 0.6

       Now , using the 1st equation of motion

ω' = ω +αt

ω' = 200 -0.6 (10)

ω' = 194 rpm.

Hence the angular speed of the stone will be 194 rpm.

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First let's see what the funny letters in the equation they gave us means.

F = Gravitational Force

G = Gravitational Constant

m1 = Mass of one of the spheres

m2 = Mass of the other sphere

r = Distance between the two spheres

Ok, now implement it.

\(\frac{9.8 x 10^{2} 1.96 x 10^{2} }{4^{2} }\)

To make it simpler

F = 980 x 196 = 192,080

192,080 ÷ 4²

192,080 ÷ 16

= 12005

F = 12,005N

If the temperature of the core of the sun decreases, the fusion rate would decrease as well. This is because temperature plays an important role in fusion reactions.

The core temperature of the sun needs to be around 15 million degrees Celsius for hydrogen fusion to occur. When hydrogen nuclei combine, they form helium, which gives off energy in the form of light and heat. The energy released by this process is what keeps the sun burning. If the temperature of the core decreased, the fusion reaction would slow down. This would cause a decrease in the amount of energy released by the sun.

This, in turn, would affect the sun's brightness and temperature. If the temperature decreased significantly, the sun could eventually run out of fuel and die. However, this would take billions of years to happen. Therefore, a small decrease in the temperature of the core would not have an immediate effect on the sun.

In conclusion, if the temperature of the core of the sun decreased, the fusion rate would decrease as well, and this would eventually lead to the sun's death.
However, this would take billions of years to happen, and a small decrease in temperature would not have an immediate effect on the sun.

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The Frictional Work output on crate is 27.468 J.

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We have to go above 2651 kilometers  of the earth for our weight to decrease to half of what it was at the surface

Geophysics applies the concepts of physics to the take a look at of the Earth. It deals with things like the motion of the Earth's crust and the temperatures of its interior.

Geology : is the medical take a look at of the earth- the material of which it is made, the methods that act on those materials, the products shaped, and the history of the planet and its existence paperwork due to the fact starting place. Geology now includes the take a look at of other planets as nicely.

We defile the earth via thinking about other people as our enemies, outsiders and foreigners; by dividing our earth into international locations and by developing enmity in opposition to any other institution of people.

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Trees are being felled at an alarming rate by people. Forests are home to numerous animals and people, and by removing trees from them, we are destroying their habitat and depriving them of a safe haven.

Community conservation refers to a strategy for protecting the environment that acknowledges local residents' rights to manage wildlife or gain both direct and indirect benefits from it.

The gorillas' habitat, the forest, is being destroyed by humans. Additionally, people are harming these creatures, and if this continues, gorillas may become extinct.

There won't be as many resources from trees, like paper, if people cut down less of them, therefore prices could rise.

Prices for tourists will increase if fewer gorillas are still alive. That won't benefit visitors since they will have to pay more, and since some individuals don't have a lot of money, there will be fewer visitors.

Thus, this way, community conservation is mandatory.

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The moment of inertia of the remaining shape, about the axis of rotational symmetry of the original disk, is (5/8)m(r^2).

The moment of inertia of a uniform disk about its central axis is given by the formula:

I = (1/2)MR^2

where I is the moment of inertia, M is the mass of the disk, and R is the radius of the disk.

In this case, the original disk has a radius of 2r, so its moment of inertia about its central axis is:

I_original = (1/2)M(2r)^2

= 2MR^2

Now, we need to consider the resulting shape after the removal of the smaller disk and the halving of the annulus.

The remaining shape is a semicircular disk with a radius of 2r and a mass of m. To find its moment of inertia about the axis of rotational symmetry of the original disk, we can use the parallel axis theorem.

The parallel axis theorem states that the moment of inertia of a body about an axis parallel to and a distance d away from an axis through its center of mass is given by:

I_new = I_cm + Md^2

where I_new is the moment of inertia about the new axis, I_cm is the moment of inertia about the center of mass axis, M is the mass of the body, and d is the distance between the two axes.

In our case, the center of mass of the remaining shape lies on the axis of rotational symmetry of the original disk, so the distance d is equal to zero. Therefore, the moment of inertia about the new axis is simply equal to the moment of inertia about the center of mass axis.

Hence, the moment of inertia of the remaining shape, about the axis of rotational symmetry of the original disk, is:

I_remaining = I_new

= I_cm

= (1/2)m(2r)^2

= 2mr^2

Finally, we need to account for the fact that the remaining shape is only half of the original annulus. Therefore, the moment of inertia of the remaining shape is halved:

I_remaining = (1/2) * 2mr^2

= m(r^2)

The moment of inertia of the remaining shape, about the axis of rotational symmetry of the original disk, is (5/8)m(r^2). This calculation takes into account the removal of the smaller disk and the halving of the annulus, resulting in a semicircular shape.

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To build a Simulink model of an amplitude modulator and square law demodulator, you can follow these steps:

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Answer:

true

Explanation:

hope it helps

The researcher is studying the amount of trash (in kgs per person) produced by households in city X, and previous research suggests that the amount of trash follows a distribution with density force fe (2) --1/7 torz.

The density function fe (2) --1/7 torz indicates the probability distribution of the amount of trash produced by households in city X. This means that the researcher can use this distribution to make predictions about the amount of trash that is likely to be produced by households in the city. The density function can be used to calculate the probability of producing a certain amount of trash per person, given the distribution.

A probability density function is a function that describes the likelihood of a continuous random variable taking on a specific value within a given range. In this case, the continuous random variable is the amount of trash (in kgs per person) produced by households in city X. The pdf provided in the question, f(e) = 1/7 for 2 ≤ e ≤ 9, indicates that the amount of trash follows a uniform distribution between 2 and 9 kgs per person.
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Explanation:

Answer:

5.6x10^4

Explanation:

use the equation V=kq/d

k is the constant 8.99x10^9

V=(8.99x10^9)q/d

q is the charge, 7.5 micro coulombs, but to get coulombs, multiply by 10^-6

V=(8.99x10^9)(7.5x10^-6)/d

And from the problem, we know that the distance is 1.2 meters

V=(8.99x10^9)(7.5x10^-6)/1.2

This simplifies to 5.6x10^4

The electric potential is 5.6 x 10⁴ v.

To find the electric potential the distance = 1.2 m

Charge q = 7.5 UC

               The amount of work needed to move a unit charge from the known point to some unknown point against the electric field  is said to be electric potential.

Formula of an electric potential is

                                     V = k ( q/r)  volt

                   V - electric potential

                    k - Coulomb constant (8.99x10^9)  

                    q -  charge

                     r- distance of separation

  V = (8.99x10⁹) (q/d)

  q = 7.5 UC ( micro coulomb) 10⁻⁶ C

   V=(8.99x10⁹)(7.5x10⁻⁶)/d

Substituting the values,

    V=(8.99x10⁹)(7.5x10⁻⁶)/1.2

    V = 5.6x10⁴ v

Thus, option A is correct.

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An astronomer who is observing visible light from a glowing cloud of gas in space uses an instrument which contains a grating with thousands of grooves on its surface. The instrument allow our astronomer will be able to d. spread out the light from the cloud into a spectrum.

A grating splits light by spreading the incoming light to form a spectrum, with different wavelengths diffracting at different angles. Gratings are used in a variety of applications, including spectrometers and monochromators, and they are often utilized in scientific and industrial settings. The use of gratings in spectrometers enables high-resolution spectral analysis of astronomical objects and can assist in the identification of different compounds based on their unique spectral characteristics.

Spectrometry is also used to detect the presence of various elements in a sample, making it a useful analytical tool. Therefore, this instrument will allow our astronomer to spread out the light from the cloud into a spectrum. Hence, option d is correct.

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The correct answer to the task given above about the force carpet and the object is:

The magnitude of the force depends on the object material.

The answer is option c.

From the task above, the simple reason why magnitude of the force depends on the object material is because the carpet will produce a much frictional force than its corresponding object.

So therefore, it can be deduced that force which exists between the carpet and the object from above depends largely on the nature of the object.

Complete question:

Which of following statements is correct about a force between the carpet and the object?

a. that force pushes in the direction that the object is moving and slows it down.

b. there is very little friction force with a bare floor that is smooth and shiny so the object doesn't experience much force pushing in the opposite direction.

c. The magnitude of the force depends on the object material.

d. None of the above.

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The correct answer is B.Antartica and Australia were one landmass millions of years ago.

The angle between the proton's velocity and the magnetic field is approximately 54.8 degrees.

To find the angle between the proton's velocity and the magnetic field, we can use the formula for the magnetic force experienced by a moving charged particle:

F = q * v * B * sin(θ)

where:

F is the magnitude of the magnetic force,

q is the charge of the particle (in this case, the charge of a proton, which is 1.6 x \(10^{-19}\)C),

v is the magnitude of the velocity of the proton,

B is the magnitude of the magnetic field, and

θ is the angle between the velocity and the magnetic field.

Given that the magnitude of the magnetic force (F) is 8.20 x \(10^{13}\) N, the charge of a proton (q) is 1.6 x \(10^{-19}\) C, the magnitude of the proton's velocity (v) is 4.00 x \(10^6\)m/s, and the magnitude of the magnetic field (B) is 1.70 T, we can rearrange the formula to solve for the angle (θ).

sin(θ) = F / (q * v * B)

sin(θ) = (8.20 x \(10^{13}\) N) / ((1.6 x \(10^{-19}\) C) * (4.00 x \(10^6\)m/s) * (1.70 T))

Using a calculator, we can evaluate the right side of the equation:

sin(θ) ≈ 0.805

Now, we can find the angle (θ) by taking the inverse sine (arcsin) of the value:

θ ≈ arcsin(0.805)

Using a calculator, we find:

θ ≈ 54.8 degrees

Therefore, the angle between the proton's velocity and the magnetic field is approximately 54.8 degree

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Answer:

use a reusable source of energy such as hydro power

Explanation:

use renewable energy it saves the environment and does not create global warming

The energy would be stored in capacitors N^2U.

The total capacitance of N identical capacitors in series is

1/Cs = 1/C + 1/C .....  N times = N/C

Cs = C/N

The energy stored in the combination is

U = 1/2 CsV²

V² =2NU/C

Now, the total capacitance of N identical capacitors in parallel is

Cp = C+ C + ....  = NC

The energy stored in this combination is

U' = 1/2CpV²

    = NCV²/2

Putting the value of V from the series equation

U' = 1/2CpV² = NC/2 × 2NU/C = N²U

When capacitors are connected in series the total capacitance is less than the individual capacitances of the series capacitors. If two or more capacitors are connected in series, the overall effect will be that of a single capacitor with the sum of the plate distances of the individual capacitors.

The energy U C U C stored in a capacitor is electrostatic potential energy and is therefore related to the charge Q and the voltage V across the capacitor plates. A charged capacitor stores energy in the electric field between its plates. An electric field is generated when a capacitor is charged. After disconnecting the capacitor from the battery, the energy stored in the capacitor doubles when the distance between the plates is doubled.

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bottom-up processing is a cognitive process that involves perceiving and understanding information based on individual sensory stimuli. examples of bottom-up processing in everyday life include recognizing objects based on their color, shape, and texture, identifying sounds based on their pitch, volume, and timbre, and perceiving tastes and textures based on individual flavors and tactile sensations.

bottom-up processing is a cognitive process that involves perceiving and understanding information based on the individual sensory stimuli. It refers to the way our brains make sense of the world by analyzing the basic features of stimuli and building up a complete perception.

In everyday life, we encounter numerous examples of bottom-up processing. For instance, when we see a new object, our brain processes its individual features such as color, shape, and texture, and then combines them to form a complete perception of the object. This allows us to recognize and understand the object without prior knowledge or expectations.

Similarly, when we hear a new sound, our brain analyzes its pitch, volume, and timbre to recognize and understand the sound. This enables us to differentiate between different sounds and identify their sources.

Bottom-up processing is also involved in other sensory experiences. When we taste a new food, our brain processes the individual flavors and textures to form a perception of the taste. Similarly, when we touch different textures, our brain analyzes the tactile sensations to understand the texture.

In summary, bottom-up processing plays a crucial role in our everyday lives by allowing us to perceive and understand the world around us based on the individual sensory stimuli we encounter.

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Answer: hello your question is poorly written attached below is the well written question

answer: 4.9 * 10^-5 T

Explanation:

Current ( i ) = 39.30 A

Determine the magnitude of the B-field at Point P

Mag of B-field at Point P = μo*I / 2π*r --- ( 1 )

where : I = 39.30 , μo = 4π * 10^-7 , r = 8*10^(-2)

Input values into equation 1

( 10^-7 * 39.30 ) / ( 8*10^-2 )

∴ Mag of B-field = 4.9 * 10^-5 T

Charles's law means that the volume of a gas is directly proportional to its absolute temperature

Boyle's Law tells us that the volume of a gas increases as the pressure decreases. Charles's law tells us that the volume of a gas increases with increasing temperature

This is stated by Karl's law, also known as the law of volumes

For a dry gas sample, its volume and Kelvin temperature are directly proportional if the pressure is kept constant

 \(\begin{equation*} PV=nRT \end{equation*}\)           P : is a Pressure(Pa)

  \(\begin{equation*} V=\frac{nRT}{P} \end{equation*}\)              V : is volume (\(m^{3}\))

                              T : absolute temperature (K)

                              R : gas constant \(\begin{equation*} 8.314K^{-1}.mol^{-1} \end{equation*}\)

                               n : amount of substance of the gas (mole)

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