when a pure water is heated , it increases in volume​

Answer:

a) To solve for the speed of the car, we can use the conservation of energy equation:

(1/2)mv^2 = mgh - (1/2)kx^2

where m is the mass of the car, v is the speed of the car, g is the acceleration due to gravity, h is the height of the car above the starting point, k is the spring constant, and x is the distance the spring is compressed.

Plugging in the given values, we get:

(1/2)(0.250 kg)v^2 = (0.250 kg)(9.81 m/s^2)(0.110 m) - (1/2)(450.0 N/m)(0.0600 m)^2

Solving for v, we get:

v = 1.23 m/s

Therefore, the speed of the car when it reaches 0.110 m above the starting point is 1.23 m/s.

b) To estimate the power expended by a child raising a 0.25-kg toy 0.75 m in 2.0 s, we can use the work-energy theorem:

W = ΔE = mgh

where W is the work done, m is the mass of the toy, g is the acceleration due to gravity, h is the height the toy is raised, and ΔE is the change in energy.

Plugging in the given values, we get:

W = (0.25 kg)(9.81 m/s^2)(0.75 m) = 1.84 J

Next, we can use the definition of power:

P = W/t

where P is power, W is work, and t is time.

Plugging in the given values, we get:

P = 1.84 J / 2.0 s = 0.92 W

Finally, we can convert watts to horsepower:

1 hp = 746 W

0.92 W = 0.92 / 746 hp = 0.0012 hp

Therefore, the power expended by a child raising a 0.25-kg toy 0.75 m in 2.0 s is approximately 0.0012 hp.

Answer:

Explanation:

Ok I am an expert in this class. two balls which is 32 weighted for both. 21+21=41+1.7=42.7/4=10.7  

Both would=10.7

The statement that best summarizes the law of conservation of energy before and after a change in a system is "The sum of the potential energy and the kinetic energy before the change equals the sum of the potential energy and the kinetic energy after the change"

The law of conservation of energy is a fundamental principle of physics that states that the total amount of energy in a closed system remains constant over time. This means that energy cannot be created or destroyed, only transformed from one form to another.

The above statement summarizes the law of conservation of energy, which states that energy cannot be created or destroyed, only transformed from one form to another. The total amount of energy in a closed system remains constant before and after any change, even though the energy can change from one form to another.

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If a component obeys Ohm’s Law, then decreasing the temperature of a material will decrease the resistance.

According to Ohm's Law, the resistance of a conductor is directly proportional to its temperature, and inversely proportional to its cross-sectional area and the length of the conductor.

However, for most conductors, the change in resistance due to a change in temperature is relatively small, and can be approximated using the temperature coefficient of resistance (TCR) of the material. The TCR is a measure of how much the resistance of a material changes per degree change in temperature.

In general, for metallic conductors, the TCR is positive, which means that the resistance increases as the temperature increases, and decreases as the temperature decreases. Therefore, if the temperature of a material decreases, the resistance of the material will also decrease, assuming that the other factors affecting resistance (such as length and cross-sectional area) remain constant.

Decreasing the temperature of a material that obeys Ohm's law generally decreases the resistance because the charged particles in the material move slower, resulting in less resistance to current.

If a component obeys Ohm’s Law, resistance in most common materials generally increases with temperature. Therefore, decreasing the temperature of a material will normally decrease the resistance. This is because the charged particles in the material move more slowly at lower temperatures, leading to less resistance to current flow.

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Answer::

The earth is planet 3 in the solar system,

That leaves only A and D

Since the solar system is also within the Milky Way galaxy that leaves only

(A) must be the correct answer

The overall charge of the atom after an electron is added is -1.

An ion is an atom or molecule that has an unequal number of protons and electrons, resulting in a net electrical charge. Atoms are normally electrically neutral because the number of protons, which carry a positive charge, is equal to the number of electrons, which carry a negative charge. However, when an atom gains or loses one or more electrons, it becomes an ion with a net electrical charge.

When an atom loses one or more electrons, it becomes a positively charged ion, or cation, since the number of positively charged protons is greater than the number of negatively charged electrons. On the other hand, when an atom gains one or more electrons, it becomes a negatively charged ion, or anion, since the number of negatively charged electrons is greater than the number of positively charged protons.

An atom with four protons and four electrons is electrically neutral since the number of positively charged protons equals the number of negatively charged electrons. When an electron is added to the atom, the number of electrons becomes five, while the number of protons remains at four. This results in a net negative charge on the atom, since the extra electron carries a negative charge.

Therefore, the overall charge of the atom after an electron is added is -1.

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For F = 60 N, the acceleration of both block A and cart B is 2.38 m/s^2, while for F = 40 N, block A and cart B have accelerations of -0.81 m/s^2 and -0.40 m/s^2 respectively, both moving backwards.

To determine the acceleration of block A and cart B, we need to draw a free body diagram for each object and apply Newton's second law, F = ma.

(a) When F = 60 N:

The forces acting on block A are the force of friction f1, the force of gravity mg1, and the applied force F. The forces acting on cart B are the force of friction f2 and the force of gravity mg2. Since the two objects are connected by a rope, they have the same acceleration a.

For block A:

F - f1 = ma

For cart B:

f1 - f2 = (m1 + m2)a

mg2 - F = m2a

Using the coefficient of friction, we can find the force of friction:

f1 = μ1N1 = μ1mg1

f2 = μ2N2 = μ2mg2

where N1 and N2 are the normal forces acting on block A and cart B, respectively.

Since the coefficient of friction is the same for both static and kinetic friction, we can assume that the block and cart are not moving relative to each other. Therefore, we can use the coefficient of static friction to find f1 and f2.

μs = 0.5

N1 = m1g1 = [tex](20 kg)(9.8 m/s^2) = 196 N[/tex]

N2 = m2g2 = [tex](100 kg)(9.8 m/s^2) = 980 N[/tex]

f1 = μsN1 = (0.5)(196 N) = 98 N

f2 = μsN2 = (0.5)(980 N) = 490 N

Substituting these values into the equations above, we get:

60 N - 98 N = 20 kg a

98 N - 490 N = (20 kg + 100 kg) a

980 N - 60 N = 100 kg a

Solving for a, we get:

[tex]a = 2.38 m/s^2[/tex] for both block A and cart B.

(b) When F = 40 N:

Following the same steps as in part (a), we can find:

μs = 0.5

N1 = m1g1 =[tex](20 kg)(9.8 m/s^2) = 196 N[/tex]

N2 = m2g2 = [tex](100 kg)(9.8 m/s^2) = 980 N[/tex]

f1 = μsN1 = (0.5)(196 N) = 98 N

f2 = μsN2 = (0.5)(980 N) = 490 N

Substituting these values into the equations above, we get:

40 N - 98 N = 20 kg a

98 N - 490 N = (20 kg + 100 kg) a

980 N - 40 N = 100 kg a

Solving for a, we get:

[tex]a = -0.81 m/s^2[/tex]for block A, indicating that it is moving backwards, and[tex]a = -0.40 m/s^2[/tex] for cart B, indicating that it is also moving backwards.

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The sound waves in front of the truck compared to the sound waves behind the truck  is using Doppler effect.

The prediction is correct.

The Doppler effect or Doppler shift is described as  the apparent change in frequency of a wave in relation to an observer moving relative to the wave source.

The apparent frequency heard by the listener differs from the frequency of the source of sound when there is relative motion between the source and listener.

The perceived frequency increases as the source and the listener go closer together, and it decreases as they get farther apart. It's called the Doppler effect.

The wave-fronts move closer as the source and listener approach closer to each other. Thus, the observed frequency is greater than the actual.

The pitch depends on frequency, greater is the pitch

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"Greenland ice sheet melting at alarming rate of 8,300 tonnes per second" is a recent article addressing some aspect of environmental science that we have covered so far this year.

This article, published in The Guardian in January 2021, addresses the melting of the Greenland ice sheet, which is a topic covered in environmental science. The article highlights a new study that found the ice sheet is melting at a rate of 8,300 tonnes per second, which is seven times faster than in the 1990s.

The melting of the Greenland ice sheet contributes significantly to rising sea levels and could have disastrous consequences for coastal communities worldwide. The article discusses the causes and potential consequences of this rapid melting, as well as the urgent need for action to mitigate climate change and its effects. This topic relates to the study of climate change, the cryosphere, and the impacts of human activity on the environment.

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Because the horizontal fraction of ground-generated pressure (F_ground) corresponds to F_wall, it is reasonable to assume that the duration of ground influence on the ladder is roughly 481.55 N in magnitude.

The ladder's grounding point on the wall is 3.0 m away with the application of the Pythagorean theorem. By analyzing the torque at the ladder's foundation and surveying its diversified forces, we can derive estimates:

• The person's strength (F_person), determined by 45.0 kg * 9.81 m/s^2 calculations, is approximately 441.45 N when applied to a length of 3.75 m.

• The ladder's mass-based force (F_ladder), calculated as 12.0 kg * 9.81 m/s^2, is about 117.72 N exerted upon a distance of 2.5 m.

• Atop the ladder falls the wall's upward-directed push action- referred to as F_wall- which operates at an elevation of 4.0m from the earth's plane.

To ensure compliance:  Equilibrium occurs if the equation (3.75 m * 441.45 N) + (2.5 m * 117.72 N) - (4.0 m * F_wall) equals zero.

Thus, F_wall ≈ 481.55 N  after resolving the problem mathematically.

Additionally, because the horizontal fraction of ground-generated pressure (F_ground) corresponds to F_wall, it is reasonable to assume that the duration of ground influence on the ladder is roughly 481.55 N in magnitude.

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Answer:  A. Divergent boundary

Explanation:

I really think its D if not i'm really sorry

The bicyclist needs to move backward by a distance of 0.2744 m to reach the nearest point of destructive interference.

The wavelength of the sound wave produced by the horns can be calculated as;

λ = v/f

λ = 343/625

λ = 0.5488 m

let the integer multiple of the wavelength = d

d = mλ

d = 4.50 + x

where;

4.50 + x = mλ

4.50 + x = m(0.5488)

let the odd multiple of half the wavelength = d'

d' = (2n + 1)(λ/2)

d' = 4.50 - y

where;

4.50 - y = (2n + 1)(λ/2)

4.50 - y = (2n + 1)(0.2744)

mλ = 2n(λ/2) + (λ/2) + 4.50 - y

x - y = (2n + 1)(λ/2) - 4.50

x - y = (2n + 1)(0.2744) - 4.50

Let n = 0

x - y = (0 + 1)(0.2744) - 4.50

y = 4.50 - 0.2744

y = 4.2256

The distance is cakculated as;

4.50 - y = 0.2744 m

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Ecotourism has the potential to eliminate the requirement to hunt wildlife for a living. Ecotourism generates revenue by maintaining the rainforest; deforestation is discouraged because it reduces tourist revenue.

Ecotourism firms safeguard biodiversity by preserving animals in their natural habitats and preserving natural ecosystems in biosphere reserves, wildlife sanctuaries, and national parks.

Ecotourism contributes to the preservation of a destination's ecological and biological diversity. For example, since Costa Rica's jungle is so popular with visitors, inhabitants work hard to protect it instead of attempting deforest it for a short-term profit.

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Answer:

A

Explanation:

One of the main benefits of informational interviewing is that it allows the person conducting the interviews to gain insights and information about a particular career or industry.

a) Yes, the force of thrust of the engine does work as it is causing the plane to accelerate and lift off the ground.

b) Yes, the kinetic energy of the plane increases as it takes off and gains speed.

c) Yes, the gravitational potential energy of the plane increases as it gains height.

d) Yes, the force of thrust of the engine changes the mechanical energy of the plane.

The kinetic energy of an object is the form of energy that it possesses due to its motion which is also defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.

The work done by the engine's thrust increases the plane's kinetic energy and gravitational potential energy, thereby changing its mechanical energy.

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The map suggest that the Pacific Ocean basin has decreased in size over the last 65 million years. Option A

The map suggest that the movement of Earth's tectonic plates has cause serious changes in the layout of the world's continents and oceans over the last 65 million years.

Plate tectonics controls the movement and relationship of the Earth's lithosphere, which is separated into several big and tiny plates.

The Map shows that  North and South America, for example, have come closer together and have become more connected, than they were positioned 65 million years ago.

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The new force of repulsion, given that their new separating distance is 5 cm, is 16×10⁴ N

We know that Coulomb's law is written as shown below:

F = Kq₁q₂ / r²

Cross multiply

Fr² = Kq₁q₂

Kq₁q₂ => constant

F₁r₁² = F₂r₂²

Where

Now, we can shall obtain the new force between the two charge, given that their distance is 5 cm apart. This is shown below:

F₁r₁² = F₂r₂²

4.0×10⁴ × 10² = F₂ × 5²

4000000 = F₂ × 25

Divide both side by 25

F₂ = 4000000 / 25

F₂ = 16×10⁴ N

Thus, the new force of repulsion is 16×10⁴ N

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The normal force on the block is approximately 20.05 N.

Force describes the interaction between objects or between an object and its environment. It causes a change in the motion of the body it acts upon.

The normal force, which counteracts the force of gravity dragging the block downward, is the force generated by the slope acting perpendicular to its surface. As the incline has no friction, there is no force acting parallel to its surface.

To ascertain the parts of the force of gravity pulling on the block, we can apply trigonometry. There are two parts to the force of gravity: one that is parallel to the incline's surface and the other that is perpendicular to it. The weight of the block, mg, where m is its mass and g is its gravitational acceleration, is equal to the component of gravity perpendicular to the inclination. mg sin θ, where is the angle of the incline, is the component of gravity that is parallel to the incline.

To calculate the acceleration of the block moving down the incline, we can apply Newton's second law, F = ma. The component of gravity parallel to the inclination, or mg sin θ, represents the net force exerted on the block. As a result, we have:

[tex]mg sin(theta) = ma[/tex]

To solve for a, we obtain:

[tex]a = g sin(theta)[/tex]

Substituting the given values, we get:

[tex]a = 9.8 m/s^2 * sin(27°)[/tex] ≈ [tex]4.69 m/s^2[/tex]

Now that we know the normal force acting on the block, we can use Newton's second law once more. The component of gravity's force perpendicular to the incline is equal in magnitude to the normal force and moves in the opposite direction. As a result, we have:

[tex]mg cos(theta) = N[/tex]

Inputting the values provided yields:

[tex]N = 2.3 kg * 9.8 m/s^2 * cos(27°)[/tex] ≈ [tex]20.05 N[/tex]

Therefore, the normal force on the block is approximately 20.05 N.

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The composition of the nucleus of bismuth-214 can be described using its nuclide notation, which consists of the element symbol, atomic number, and mass number.The element symbol for bismuth is Bi, which has an atomic number of 83, meaning that all atoms of bismuth have 83 protons in their nucleus.The mass number of bismuth-214 is 214, which means that a typical bismuth-214 nucleus contains 83 protons and 131 neutrons (since mass number = number of protons + number of neutrons).Therefore, the nucleus of bismuth-214 can be represented by the nuclide notation: ^214Bi.

The Earth's magnetic field at the location has a magnitude of 5.50×10^−5 T and points into the Earth at an angle of 58.0 degrees below a line pointing due north.

What is Magnetic Field?

A magnetic field is a region of space surrounding a magnet or a current-carrying conductor in which magnetic forces are exerted on other magnetic objects or moving charged particles. Magnetic fields are characterized by their direction, magnitude, and polarity. The direction of a magnetic field is defined as the direction in which a magnetic north pole would be pulled or aligned, and is conventionally represented by magnetic field lines that form closed loops.

Based on the information provided, it seems like you have described a situation where a circular coil with a diameter of 14.0 cm and containing nine loops is lying flat on the ground.

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A circular coil 14.0 cm in diameter and containing nine loops lies flat on the ground. The Earth's magnetic field at this location has magnitude 5.00×10−5T and points into the Earth at an angle of 58.0 ∘ below a line pointing due north. A 6.90-A clockwise current passes through the coil. Determine the torque on the coil, and which edge of the coil rises up: north, east, south, or west?

The force exerted by the table on the block to keep it at rest is equal in magnitude but opposite in direction to the force exerted by the block on the table.

Therefore, the force exerted by the table on the block is 15 N, the weight of the block. This is because the block is at rest and not accelerating, which means that the net force acting on it must be zero.

Since the force of gravity acting on the block is 15 N and it is not accelerating, the force exerted by the table on the block must also be 15 N but in the opposite direction, which balances out the gravitational force.

In summary, the force exerted by the table on the block to keep it at rest is 15 N, which is equal in magnitude but opposite in direction to the force exerted by the block on the table.

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The current through the 16 ohms resistor is 0.2 A.

Current is the rate of flow of charge in a circuit.

To calculate the current through the 16 ohm resistor, we use the formula below

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence the current is 0.2 A.

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The gauge pressure at point 1 = 145.2 kPa.

The equation states that the sum of the pressure, kinetic energy, and potential energy per unit volume of a fluid is constant along a streamline, in the absence of external forces like friction or viscosity.

The principle of continuity of mass flow rate and Bernoulli's equation, which connects pressure, velocity, and height of a fluid in a flow, can be used to solve this issue.

With the provided data, we can first determine the soft drink's mass flow rate:

mass flow rate =[tex](220 cans/min) x (0.355 L/can) x (1 kg/L) x (1 min/60 s)[/tex] = [tex]1.235 kg/s[/tex]

Then, we may compare the soft drink's velocities at positions 1 and 2 using the principle of continuity:

[tex]A1 v1 = A2 v2[/tex]

where A1 and A2 are the pipe's cross-sectional areas at points 1 and 2, respectively, and v1 and v2 are the soft drink's velocities at those same locations. When we solve for v1, we get:

[tex]v1 = (A2/A1) v2 = (8.00 cm^2)/(2.00 cm^2) v2 = 4 v2[/tex]

Now, we can link the pressures, velocities, and heights of the soft drink at points 1 and 2 using the Bernoulli's equation:

P1 + (1/2)ρv1²+ ρgh1 = P2 + (1/2)ρv2²+ ρgh2

where P1 and P2 are the gauge pressures at points 1 and 2, respectively; ρ is the soft drink's density; g is gravity's acceleration; and h1 and h2 are the heights of the respective points 1 and 2 above a reference level.

As the soft drink contains primarily water, we may calculate its density using the formula: = 1000 kg/m3. Moreover, we can decide to set the reference level at point 2, making h2 = 0.When the supplied values and the velocity relation are substituted, we obtain:

[tex]P1 + (1/2)(1000 kg/m^3)(16 v2^2) + (1000 kg/m^3)(9.81 m/s^2)(1.35 m)[/tex] =[tex]152 kPa + (1/2)(1000 kg/m^3)(v2^2)[/tex]

By condensing and figuring out P1, we get at:

[tex]P1 = 152 kPa + (1/2)(1000 kg/m^3)(15 v2^2) - (1000 kg/m^3)(9.81 m/s^2)(1.35 m)[/tex] = [tex]152 kPa + 6.75 v2^2 - 13.33 kPa[/tex]

We must now locate v2. We can link the velocity and the cross-sectional area at point 2 using the mass flow rate relation and the density of the soft drink:

[tex]A2 v2[/tex] = (mass flow rate)/ρ =[tex]1.235/(1000 kg/m^3)[/tex]= [tex]0.001235 m^3/s[/tex]

Upon solving for v2, we obtain:

v2 =[tex]0.001235 m^3/s / (8.00 cm^2 / 10000 cm^2)[/tex]= [tex]0.1544 m/s[/tex]

Last but not least, we can insert this value into the P1 expression to obtain:

[tex]P1[/tex] =[tex]152 kPa + 6.75 (0.1544 m/s)^2 - 13.33 kPa[/tex] = [tex]145.2 kPa[/tex]

As a result, point 1's gauge pressure is 145.2 kPa.

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The traffic cop needs 23.3 seconds to pass the automobile.

When your velocity (not speed) changes, you are accelerating. A automobile moving at a steady 100 km/h in a straight line has no acceleration. Average acceleration is equal to (change in velocity) / (duration). The car's acceleration is zero because its change in velocity is also zero.

[tex]d1 = v1*t1 = 35.0 m/s * 1 s = 35.0 m[/tex]

[tex]d = d1 = 35.0 m[/tex]

[tex]d2 = v2*t + (1/2)at^2[/tex]

[tex]d2 = (1/2)at^2[/tex]

[tex]v2*t + (1/2)at^2 = (1/2)at^2[/tex]

[tex]v2*t = (1/2)at^2[/tex]

Solving for t, we get:

[tex]t = (2v2/a) = (235.0 m/s)/3.0 m/s^2 = 23.3 s[/tex] (rounded to 2 decimal places)

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The objects' masses and the distance between them affects how much gravitational force the objects will exert on each other. Hence option A is correct.

Gravitational force is force of attraction between two masses. Gravitational force(F) between two bodies is directly proportion to the product of masses(m₁,m₂) of two bodies and inversely proportional to square of distance(r) between them. mathematically it is written as,

F ∝ m₁.m₂

F ∝ 1/r²

F = G m₁,m₂÷r²

where G is gravitational constant, whose value is 6.6743 × 10⁻¹¹ m³ kg-1s⁻².

Force is expressed in Newton N in SI unit. its dimensions are [M¹L¹T⁻²].

This is analogous with coulomb's law which gives force between two charges.

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I mean if it will be anything the asnwer would be 23^90'200

The height the weight-watcher needs to climb to work off the equivalent of the chocolate cake is 0.5225 km.

The height the weight-watcher needs to climb to work off the equivalent of the chocolate cake is calculated as follows;

P.E = mgh

Where;

720 Calories x 103 calories/1 food Calorie = 74,160 calories

74,160 calories = 310285.44 J

h = P.E/mg

h = (310285.44) / (60.6 x 9.8)

h = 522.5 m

h = 0.5225 km

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Answer:

100

Explanation:

F = m * a

Given that the mass (m) of the toy car is 20 grams (or 0.02 kilograms, since 1 kilogram = 1000 grams) and the acceleration (a) is 5 m/s^2, we can plug these values into the formula to calculate the force (F):

F = 0.02 kg * 5 m/s^2 = 0.1 N

So, the amount of force required to accelerate the 20 gram toy car at 5 m/s^2 is 0.1 N, which is equivalent to 100 N when rounded to the nearest whole number. Therefore, the correct answer is 100 N.