Which of the choices is the best definition of heat

Answers

Answer 1

Heat is thermal energy that is transferred from a hotter body to a cooler body.

Which is the best definition of heat?

Heat is the transfer of kinetic energy from one means or object to another, or from an energy origin to a medium or object. Such energy transfer can occur in three ways: radiation, instruction, and convection. Heat is the exchange of "thermal” energy due to a temperature difference. examine an isolated system made up of two subsystems initially at two different temperatures.

Heat is a form of energy that built the substance hot. In winter, it is our usual experience that we feel cold inside the house, and heat if we come out in front of sun rays, then we experience warm.

So we can conclude that Heat is also called thermal energy.

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Related Questions

Can astronauts in space be massless?

Answers

Astronauts and their spacecraft still have mass and are subject to the effects of Earth's gravity while they are in space. In this way, even though the gravitational pull of the Earth is weaker in space than it is on Earth's surface, objects still have weight.

What role does mass play in the universe?

All objects fall at the same pace due to gravity in a vacuum. It is irrelevant how much mass the thing has.

Why, though they are not massless, are astronauts in space believed to be weightless?

"The force that gravity exerts on the item," according to our textbook, is how weight is defined. The astronauts are weightless since space has zero gravity. But since mass is a measure of how much matter is there, they are not massless. Independent of gravity, mass may be measured.

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Calculate approximately the total translational kinetic energy of all the molecules in an E. coli bacterium of mass 2.0 x 10-15 kg at 37°C. Assume 70% of the cell, by weight, is water, and the other molecules have an average molecular mass on the order of 10' u.

Answers

The total translational kinetic energy of the molecules in an E. coli bacterium at 37°C can be made.

To calculate the total translational kinetic energy of all the molecules in an E. coli bacterium, we need to know its temperature and the molecular masses of the constituent molecules.

At 37°C, the temperature of the bacterium can be converted to kelvins: 37°C + 273.15 = 310 K

We can then use the equation for the average kinetic energy of an ideal gas to find the translational kinetic energy per molecule:

[tex]E_k = \frac{3}{2} kT[/tex], where k is the Boltzmann constant ( [tex]1.38 x 10^{-23} J/K[/tex]) , T is the temperature in kelvins, and [tex]E_k[/tex] is the average kinetic energy per molecule.

For the water molecules, which make up 70% of the bacterium by weight, their average molecular mass is approximately 18 u, and for the other molecules, the average molecular mass is on the order of 10' u.

By assuming the bacterium has N molecules, we can find its total translational kinetic energy:

[tex]E_t = N \cdot E_k = N \cdot \frac{3}{2} \cdot k \cdot T = \frac{3}{2} \cdot k \cdot T \cdot N[/tex]

(mass of bacterium / average molecular mass)

Therefore, the total translational kinetic energy of all the molecules in an E. coli bacterium of mass [tex]2.0 * 10^{-15} kg[/tex]   at 37°C can be calculated as:

[tex]E_t = \frac{3}{2} * (1.38 x 10^{-23} J/K) * 310 K * (2.0 * 10^{-15} kg / (18 u * (10^{-3} kg/u) * 0.7 + (10^5 u * (10^{-3} kg/u) * 0.3))[/tex]

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lan holds a magnet a few centimeters away from a pile of metal washers. The magnetic force on
the washers is strong enough that they slide across the table towards the magnet.
How could lan decrease the magnetic force on the washers?

Answers

lan can decrease the magnetic force on the washers by increasing the distance between the magnet and the pile of metal washers.

What is a magnet?

A material or object that creates a magnetic field is called a magnet.

The most noteworthy characteristic of a magnet, a force that pulls on other ferromagnetic elements like iron, steel, nickel, cobalt, etc., as well as the ability to attract or repel other magnets, is caused by this invisible magnetic field.

The strength of the magnetic force produced by a magnet increases when the distance between the magnet and an object experiencing the magnetic force is reduced.

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examine the strands of dna. what do you observe about the arrow ends of the model

Answers

The direction that the genes are transcribed is shown by the arrows. The arrow directs attention to the 3' end. When creating DNA strands, arrows are crucial.

Using only the nucleotides A, T, G, and C, construct a compact DNA molecule. Because of their antiparallel structure, the two strands of the double helix that make up DNA molecules move in the opposite directions from one another. Humans and unicellular protists are two eukaryotic species that have telomeres, which are repeating regions at the very ends of chromosomes. The telomeres, which function as caps to protect the internal chromosomal regions, lose a small amount of their length with each cycle of DNA replication.

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5. are the 4 v, 5 v, 6 v equipotential lines between the two parallel plates evenly spaced? explain why or why not.

Answers

The 4 V, 5 V, and 6 V equipotential lines between two parallel plates are evenly spaced.

Equipotential lines represent points in space that are at the same potential or voltage. In the context of two parallel plates, these lines would be perpendicular to the plates and would indicate the potential at different points between them.

If the 4 V, 5 V, and 6 V equipotential lines are evenly spaced, this means that the potential difference between the plates is uniform and the same at each of these points. This would occur if the electric field between the plates was uniform and the same in strength everywhere.

The uniformity of the electric field is due to the plates being parallel and of equal size, as well as the presence of a uniform electric charge on each plate. These conditions would lead to a uniform distribution of the electric field and the equipotential lines being evenly spaced.

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An object has been traveling at a constant velocity of 50ms for 5seconds what was the acceleration of the object?

Answers

Answer:it would be zero since its constant velocity and there is no acceleration

Explanation:

A red planet is orbiting the blue sun with the Semi-Major axis (a) of 1,550,000 m and the linear eccentricity (c) of 850,000 m.

What is the eccentricity of the red planet? (Round up to the nearest fourth - 0.xxxx) _______________

*Hint : Use the formula eccentricity = ca and some algebra.

Answers

The eccentricity of the red planet is 1.3175 x 10¹² m².

What is the eccentricity of the red planet?

The eccentricity of the red planet is the product of the Semi-Major axis (a) and the linear eccentricity (c).

The Semi-Major axis (a)  is given as 1,550,000 m and the linear eccentricity (c) is given as 850,000 m.

The eccentricity of the red planet is calculated as follows;

e = ca

e = 850,000 m x 1,550,000 m

e = 1.3175 x 10¹² m²

Thus, the eccentricity of red planet is a function of the Semi-Major axis (a)  and the linear eccentricity (c) .

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Part A)
What is the electric flux ? through each of the six faces of the cube?
Use ?0 for the permittivity of free space.
Part B)
What would be the flux ?1 through a face of the cube if its sides were of length L1 ?
Use ?0 for the permittivity of free space.

Answers

Part A.

It is impossible to determine the speed of the test charge at point y based solely on the information provided. The speed of the charge at point y could be greater than, less than, or equal to v0 depending on various factors such as the presence of electric flux or magnetic fields, resistance, or other forces that may have acted on the charge between points x and y. A detailed analysis of the situation taking into account all relevant factors would be required to determine the speed of the charge at point y.

Part B.

The electric flux through a face of a cube can be calculated using the following formula:

Φ = ε0 * E * A

where Φ is the electric flux, ε0 is the permittivity of free space (8.854 x 10^-12 C^2/Nm^2), E is the electric field through the face, and A is the area of the face.

Given that the sides of the cube have length L1, the area of one face can be calculated as A = L1^2. Substituting this value into the formula for Φ, we get:

Φ = ε0 * E * L1^2

So, the electric flux through one face of the cube can be calculated by multiplying the permittivity of free space, the electric field through the face, and the square of the side length.

About Electric Flux

Electric Flux is the number of lines of force from the electric field that penetrates a surface, even though the electric field in a conductor is not moving. Electric flux is used to describe and measure the magnitude of the electric field at a certain distance from the test charge.

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15. A car moving at a speed of 48.0 km/h accelerates 100.0 m up a steep hill, so that at the top of the hill its speed is 59.0 km/h. If the car's mass is 1100 kg, what is the magnitude of the net force acting on it?

Answers

The magnitude of the net force acting on the car is 33.66 N.

What is the net force?

To calculate the net force acting on the car, we can use the formula:

Force = mass x acceleration

where acceleration can be calculated using the change in velocity. To convert the velocity units to SI units, we first convert km/h to m/s:

[tex]48.0 km/h = (48.0 x 1000/3600) m/s = 13.33 m/s\\59.0 km/h = (59.0 x 1000/3600) m/s = 16.39 m/s[/tex]

The change in velocity is then given by:

[tex]Δv = v_f - v_i = 16.39 m/s - 13.33 m/s = 3.06 m/s[/tex]

The acceleration can then be calculated as:

a = Δv / Δt

where Δt is the time taken to cover the 100 m distance. We can assume this to be a constant, so:

[tex]a = Δv / Δd = 3.06 m/s / 100 m = 0.0306 m/s^2[/tex]

Finally, the net force can be calculated as:

Force = [tex]m x a = 1100 kg x 0.0306 m/s^2 = 33.66 N[/tex]

The magnitude of the net force acting on the car is 33.66 N.

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The collar A slides on the smooth vertical bar. The masses mA = 20 kg and mB = 10 kg. When h = 0.1 m, the spring is unstretched. When the system is in equilibrium, h = 0.3 m. Determine the spring constant k.Read more on Sarthaks.com - https://www.sarthaks.com/541136/the-collar-a-slides-on-the-smooth-vertical-bar-the-masses-ma-20-kg-and-mb-10-kg

Answers

The spring constant k can be determined using the equation:

Therefore, k = (30 × 9.81 + 20) × 0.3/(0.3^2 - 0.1^2) = 301.53 N/m .

What is the equation?

The equation is a mathematical expression that states the equality of two expressions. It is typically written using symbols and numbers and is used to find the solution to a problem. Equations are used in all fields of mathematics, from basic algebra to calculus and beyond. They can also be used to find the relationships between variables, explore trends, and make predictions. Equations are a powerful tool for understanding and manipulating the world around us.

k = (mg + mA)h/(h2 - h1)

where m is the total mass of the system (m = mA + mB), g is the acceleration due to gravity, h is the height of the system in equilibrium, and h1 and h2 are the heights at which the spring is unstretched and stretched, respectively.

In this case, m = 30 kg, g = 9.81 m/s2, h = 0.3 m, h1 = 0.1 m, and h2 = 0.3 m.

Therefore, k = (30 × 9.81 + 20) × 0.3/(0.3^2 - 0.1^2) = 301.53 N/m .

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a hypothetical planet has a radius 1.98 times that of earth, but has the same mass. what is the acceleration due to gravity near its surface? the radius of the earth is 6380 km, and the mass of the earth is 5.98 x 1024 kg.

Answers

The acceleration due to gravity near the surface of the hypothetical planet is 9.79 m/s^2, which is the same as the acceleration due to gravity near the surface of the Earth.

The acceleration due to gravity near the surface of a planet is given by the formula:

g = G * M / R^2

where G is the gravitational constant (6.67 x 10^-11 Nm^2/kg^2), M is the mass of the planet, and R is the radius of the planet.

Since the mass of the hypothetical planet is the same as the Earth, we can use the mass of the Earth for M. The radius of the hypothetical planet is 1.98 times the radius of the Earth, so we can use the following for R:

R = 1.98 * 6380 km = 12618.4 km

We can now substitute these values into the formula for g:

g = 6.67 x 10^-11 Nm^2/kg^2 * 5.98 x 10^24 kg / (12618.4 x 10^3 m)^2

Simplifying this expression gives us:

g = 9.79 m/s^2

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Choose several tasks, and describe the features the ship and spacesuits should have to account for zero gravity as the astronaut completes the task. Use Newton's laws of motion in your analysis

Answers

When designing a ship and spacesuits for astronauts to use in zero gravity, it is important to take into consideration Newton's laws of motion. For instance, the ship and spacesuits should be designed to minimize or eliminate the effects of inertia, which will allow the astronauts to move more easily.

Additionally, the ship and suits should be light and streamlined to minimize air resistance and drag in the vacuum of space. Finally, the ship and suits should be designed to provide adequate protection from the extreme temperatures of space. All of these design considerations should take into account Newton's laws of motion to ensure the safety and comfort of the astronauts.

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Express D in the form Dx, Dy, where the x and y components are separated by a comma using two significant figures. The figure shows vectors A and B. Find Ď=2.4 Ā+B. (Figure 1) Figure (< 1 of 1 > 2. m 15011 1150 4 m

Answers

For each Part, the x- and y-components of the vectors are mathematically stated as follows.x=-1.939 km and y=3.498 km,x= -2 cm/s,0, y=, x= -7.6412m/s^2, -10.517m/s^2

What are the vectors' x- and y-components?

Measures for the question

We typically adhere to a fundamental premise where

component=Fsintheta for x

Fcostheta as the y component

Therefore

For A

the x component

x= -4 x sin (29°)

x= -1.939 km

Is y component

y= 4 x cos (29°)

y= 3.498 km

For B

the x component

x= -2 cm/s

Is y component

y= 0

For C

the x component

x= -13 x sin (36°)

x= -7.6412m/s^2

Is y component

y= -13 x cos (36°)

y= -10.517m/s^2

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The full question:

Part AFind the x- and y-components of the vector d⃗ = (4.0 km, 29 ∘ left of +y-axis). Express your answer using two significant figures. Enter the x and y components of the vector separated by a comma.d⃗ = km Part BFind the x- and y-components of the vector v⃗ = (2.0 cm/s , −x-direction).Express your answer using two significant figures. Enter the x and y components of the vector separated by a comma.v⃗ = cm/s Part CFind the x- and y-components of the vector a⃗ = (13 m/s2 , 36 ∘ left of −y-axis).Express your answer using two significant figures. Enter the x and y components of the vector separated by a comma.a⃗ x = m/s2

A cube of matter with sides of 1. 2 cm has a mass of 51. 84 g. What is its density?.

Answers

The density of cube is 300000 kg/m^3.

The density of material shows the denseness of that material in a specific given area. A material’s density is defined as its mass per unit volume. Density is essentially a measurement of how tightly matter is packed together. It is a unique physical property of a particular object.

We know that density of a substance is : Mass/volume

Given,

Mass = 51.84g = 51.84 / 1000 kg

Volume = 0.012* 0.012* 0.012 m^3

Putting these values in above equation we get;

Density =  300000 kg/m^3.

So the density of cube is  300000 kg/m^3.

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choose the appropriate formula for calculating the density of a substance.

Answers

The density of an object can be calculated using the equation density = mass / volume.

Definition of Density

Density is a measurement of the mass per unit volume of an object. Or it could also be interpreted as a comparison between the mass and volume of an object, as reported by the Ministry of Education and Culture's Learning Resources website.

The higher the density of an object, the greater the mass of each volume. The average density of each object is the total mass divided by the total volume.

An example of an object that has a higher density is iron, while an example of an object that has a lower density is water.

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Calculate the magnitude and direction of the electric field 0. 45 m from a +7. 85 x 10−9 C point charge

Answers

The electric field is directed away from the positive charge, so its direction is radially outward from the charge. The magnitude of the electric field is 9.29 x 10^5 N/C.

An electric field is a field that surrounds a charged particle or a collection of charged particles and can affect other charged particles in the vicinity. It is a vector field that represents the force that would be exerted on a test charge placed in that field. The strength of the electric field at a particular point is defined as the force per unit charge at that point.

The electric field (E) generated by a point charge (Q) at a distance (r) from the charge is given by Coulomb's law: E = k * Q / r^2, where k is Coulomb's constant (approximately equal to 8.99 x 10^9 N m^2/C^2). To find the magnitude and direction of the electric field 0.45 m from a +7.85 x 10^-9 C point charge, we can use the formula:

E = k * Q / r^2 = 8.99 x 10^9 N m^2/C^2 * 7.85 x 10^-9 C / (0.45 m)^2 = 9.29 x 10^5 N/C

Therefore, The electric field is directed away from the positive charge, so its direction is radially outward from the charge. The magnitude of the electric field is 9.29 x 10^5 N/C.

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what is the speed of a cheetah in kilometers per hour?

Answers

The top speed of a cheetah is generally approximately 120 km/h (75 mph). However, this speed is only possible over short distances, usually around 460 meters (500 yards), and the cheetah may attain it in a matter of seconds. Its speed decreases after that distance as it becomes fatigued.

What is speed?

Speed is the pace at which an item moves along a route in time, whereas velocity is the rate and direction of movement. In other words, velocity is a vector, whereas speed is a scalar number. The pace at which an object's location changes in any direction. Speed is defined as the ratio of distance traveled to time spent traveling. The direction of movement of the body or item is defined by velocity. Speed is fundamentally a scalar number. Velocity is, in essence, a vector quantity. It is the pace at which distance changes. It is the displacement rate of change.

Here,

A cheetah's peak speed is usually around 120 km/h (75 mph). However, this speed is only achievable over short distances, often approximately 460 meters (500 yards), and the cheetah may reach this speed in a couple of seconds. Its speed slows after that distance as it tired.

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according to kepler’s second law, a planet in an elliptical orbit around the sun is travelling fastest when it is at what position?

Answers

Kepler's second law states that a planet moves most quickly during perihelion and most slowly at aphelion. The orbit's total period (T) is related to the cube of the planet's average distance from the Sun (R).

What is the second law of Kepler?

According to Kepler's Second Law, as a planet rounds the Sun, an arbitrary vertical connecting them sweeps across the same amount of space at the same rate. In essence, this means that asteroids do not travel throughout their revolutions at a constant speed.

The significance of Kepler's second law:

The speed of the planet as it travels through its elliptical orbit is governed by Kepler's second law. Kepler demonstrated that no matter where in the orbit the planet is, the region that it "sweeps out" over a period of time is the same.

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What would be the coefficient of
friction between a sandal and wood
if the weight of the shoe is 14 N
and it takes 7N of force to slide it at
a constant speed across the wood?

Answers

The coefficient of friction between a sandal and wood would be 0.5

In physics, what is a friction?

The force that prevents motion when the surfaces of two objects come into contact is known as friction. Friction lessens a machine's mechanical advantage, or, to put it another way, friction decreases the output to input ratio.

A coefficient of friction is a number that depicts the interaction between two objects and their typical response to one another. The resistive force of friction divided by the normal or perpendicular force pushing the objects together yields the coefficient of friction, which is a numerical value. Equation represents it as follows:

Coefficient of friction, μ = Ff /FN

                                      μ = 7/14

                                      μ = 0.5

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a charged particle a exerts a force of 2.66 n to the right on charged particle b when the particles are 12.9 mm apart. particle b moves straight away from a to make the distance between them 18.0 mm. what vector force does particle b then exert on a?

Answers

The force exerted by b on a is given by 1.90N along the left.

Let the charge of the particle 'a' and 'b' be q and Q respectively.

Given,

The force exerted ([tex]F_{ab}[/tex]) when the two particles are at distance (d = 12.9 mm) is 2.66 N from a to b.

So, [tex]F_{ab} = \frac{kqQ}{d^2} \hat{x}[/tex] (along the right)

[tex]\implies F_{ab} \times d^2 = kqQ\\\implies kqQ = 2.66 N \times 12.9 mm\\\implies kqQ = 34.314 Nmm[/tex]

Now after the separation between them is 18 mm

The force on a due to b when the distance between them is (D = 18mm) is ([tex]F_{ba}[/tex])

i.e. [tex]F_{ba} = \frac{kqQ}{D^2}(-\hat{x})[/tex] (along the left)

[tex]\implies kqQ = -F_{ba}\times D^2 \\\implies 34.314 Nmm = -F_{ba} \times 18mm\\\implies F_{ba} = -1.90 N[/tex]

Hence the force exerted by b on a is given by 1.90N along the left.

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how does this compare to the density of earth (5500 kg/m3)? times the density of earth

Answers

The density of earth is 5500 kg/m3 and the density of sun is 0.256 times the density of Earth.

Given that Earth's volume is 5500 kg/m3,

When comparing the density of the Sun with the Earth, we must split the:

The ratio of Earth's density to that of the Sun is 0.256, or 1410 kg/m3 to 5,500 kg/m3.

The sun has a density that is 0.256 times that of Earth.

The density of the Earth is 5.52 grams per cubic centimeter, as determined by a number of measurement techniques. 5520 kilos per cubic meter is [this value's equivalent. The earth's mass per cubic centimeter is 5.514 g/cm3. r = 6.37 106 meters is the radius of the earth. We may calculate the needed average density of the stuff in the earth as 5.514 gm/cm3 by dividing the mass of the Earth by its volume. Earth has an average density of 51 g/cm3.

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Find the location of the CM of a system of three particles arranged such that two of the particles with
mass m are separated by distance l along the y-axis. The third mass 2m lies on the x-axis and is separated
by a distance l from one of the masses.

Answers

The location of the CM of a system ( 0.5l , 0.25l )

How to solve for the location of the CM of a system

x = (m1.x1 +m2.x2 +m3.x3) / ( m1 + m2 +m3)

x = ( m x 0 + m x 0 + 2m x l ) / ( m+m+2m)

x = 2m x l / 4m

x = 0.5 l

y = (m1 x y1 +m2 x y2 +m3 x y3) / ( m1 + m2 +m3)

y = (m x 0) + m x l + 2m x 0 ) / ( m + m + 2m )

y = m x l / 4m

y = 0.25 l

A position established in relation to an object or set of objects is the center of mass.

It represents the system's average location as weighted by each component's mass.

The center of mass for straightforward stiff objects with homogeneous density is found at the centroid.

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For the transistor model in the following figure, obtain the Thevenin equivalent at terminals a-b if R1 = 3 kΩ and R2 = 5 kΩ 21V (± 20i R. 2 Th eq

Answers

For the transistor model in the following figure, obtain the Thevenin equivalent is [tex]V_{th}[/tex]=-700V and [tex]R_{th}=5[/tex]kohm.

To find the Thevenin equivalent ,

By temporarily removing the load resistance from the original circuit and reducing what is left to an analogous circuit made up of a single voltage source and series resistance, Thevenin's theorem can simplify this analysis.

After reconnecting the load resistance to the Thevenin equivalent circuit, calculations can be performed as if the entire network were just a straightforward series circuit.

Now, the voltage given is 21V

[tex]R_{1}=3[/tex] kohm

[tex]R_{2}=5[/tex] kohm

as, V=ir

So, I=[tex]\frac{21}{R_{1} }[/tex]

I=[tex]\frac{21}{3}[/tex]

I=7mA

[tex]V_{th}[/tex]=-20I×[tex]R_{2}[/tex]

[tex]V_{th}[/tex]=-20×7×5

[tex]V_{th}[/tex]=-700V

and to find the value of [tex]R_{th}[/tex]

i=0A

20i=0 means it is short circuit.

[tex]R_{th}=R_{2}=5[/tex] kohm

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How does Earth's mass differ from the Moon's mass?

Answers

Earth's mass is approximately 81 times greater than the Moon's mass. Earth has a mass of approximately 5.97 x 10^24 kilograms, while the Moon has a mass of approximately 7.34 x 10^22 kilograms.

Why Earth's mass is more than Moon's mass?

Earth's mass is much greater than the Moon's due to its larger size and composition. Earth is a terrestrial planet with a dense iron-nickel core, while the Moon is a smaller, rocky satellite.

Earth's greater size allowed it to retain more heat and develop a stronger gravitational field, which in turn allowed it to retain more volatile elements and heavier elements that would have otherwise been lost to space. This led to a more massive planet with a much stronger gravitational pull, which makes it about 81 times more massive than the Moon.

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The specific rotation of L-dopa in water is -39.5. The specific rotation of a solution of L-dopa and its enantiomer was determined to be -19.75. Calculate the % of L-dopa in the solution. O A 15% 0 B 25% O C 50% OD 75% OE 80%

Answers

calculate the % of L-dopa in the solution, we can use the following equation:

% L-dopa = 100 * (specific rotation of solution - specific rotation of enantiomer) / (specific rotation of L-dopa - specific rotation of enantiomer)

The specific rotation of the enantiomer is the same magnitude as the specific rotation of L-dopa, but opposite in sign. So, the specific rotation of the enantiomer is 39.5.

Plugging in the values:

% L-dopa = 100 * (-19.75 - 39.5) / (-39.5 - 39.5) = 100 * (59.25) / 0 = undefined

Since the denominator is zero, the % L-dopa is undefined.

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which of the following are true? check all that apply. in equilibrium, there is a net flow of mobile charged particles inside a conductor. the net electric field at any location inside a block of copper is zero if the copper block is in equilibrium. if the net electric field at a particular location inside a piece of metal is zero, the metal is not in equilibrium. the electric field from an external charge cannot penetrate to the center of a block of iron. the net electric field inside a block of metal is zero under all circumstances.

Answers

The following are true:

The net electric field at any location inside a block of copper is zero if the copper block is in equilibrium.

The net electric field inside a block of metal is zero under all circumstances.

The electric field from an external charge cannot penetrate to the center of a block of iron.

Equilibrium in a conductor refers to a state where the electric field is zero inside the conductor and there is no net flow of mobile charged particles. The electric field from an external charge cannot penetrate to the center of a block of iron, meaning that the electric field is confined to the surface of the metal. The net electric field at any location inside a block of copper is zero if the copper block is in equilibrium, meaning that the electric field is uniform and balanced throughout the conductor. The net electric field inside a block of metal is zero under all circumstances, regardless of the presence of an external electric field. This is because the electric field inside a metal is always balanced and uniform, due to the movement of mobile charged particles within the conductor.

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The population, actual and predicted, of Alaska x years since the end of 2000 can be modeled as A(x) = 0.638x2 + 6.671x + 627.619 thousand people. (a) What is Alaska's population expected to be at the end of 2022? people (b) When is Alaska's population expected to reach 850,000? (Round your answer to three decimal places.) It will take 14.160 years after the end of 2000 for the population of Alaska to exceed 850,000 people. This will occur in December 2015 x 1

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A) The population of Alaska is expected to be 1083.173 thousand at the end of year 2022.

B) Alaska’s population is expected to reach 850,000 at the end of 14.160 years after the end of 2000.

Population of Alaska at the end of x years is given as: A(x) = 0.638x^2 + 6.671x + 627.619 thousand people……..(i)

To find the population of Alaska in the year 2022,

x= 0 in the year 2000

therefore, x= 22 in the year 2022

putting value in x in equation (i),

A(22) = 0.638(22^2) + 6.671*22 + 627.619= 1083.173 thousand people

The number of years it will take for Alaska to exceed 850000 people is,

Since the population equation is provided in thousand, the equation now becomes:

A(x) = 0.638x^2 + 6.671x + 627.619= 850

0.638x^2 + 6.671x – 222.381= 0

Using Sridhar Acharya’s formula,

x=(-b±√(b^2-4ac))/2a

x= (-6.671 ± √((6.671^2)- 4*(0.638*(-222.381))))/2*0.638

x = (-6.671 ±  √(44.502 +567.51))/1.276

x = (-6.671+ 24.739)/1.276 or (-6.671 - 24.739)/1.276

x= 14.16 or -24.61

therefore, the number of years that Alaska will take to exceed its population above 850000 is 14.16 years from 2000

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what is the direction of the net force on the charge at the top

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The direction of the net force on the charge at the top is downwards.

This is because the electric field created by the charge at the bottom exerts an electric force on the charge at the top, which is directed downwards. This electric force is greater than the force of gravity, which acts upwards, resulting in a net force directed downwards. This is a result of the inverse square law of electrostatics, which states that the force between two point charges is proportional to the inverse of their distance squared. Thus, the force between the charges is stronger when they are closer together, resulting in a net force directed downwards.

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Stairways must be installed at least _____ degrees, but no more than ____ degrees from the horizontal.

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Stairways must be installed at least 30 degrees, but no more than 50 degrees from the horizontal.

Stairways and stepping stools are a significant wellspring of wounds and fatalities among development laborers.OSHA gauges that there are 24,882 wounds furthermore, upwards of 36 fatalities each year because of falls from flights of stairs and stepping stools utilized in development. Almost 50% of these wounds are adequately serious to demand investment off the gig - 11,570 lost working day wounds and 13,312 non-lost business day wounds happen yearly because of tumbles from flights of stairs and stepping stools utilized in development.

These information show that work nearby stepping stools and flights of stairs is dangerous. All the more significantly,they show that consistence with OSHA's necessities for the protected utilization of stepping stools and flights of stairs might have forestalled large numbers of these wounds.

This conversation fills in as a speedy and simple reference for use on places of work. The prerequisites of OSHA security guidelines for the protected utilization of stepping stools and steps (Subpart X, Title 29 Code of Government Guidelines, Part 1926.1050 through 1926.1060) are made sense of conversation.

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what is the 'energy per degree of freedom' of a gas particle at temperature 376k? state the answer in [ev] units.

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The energy per degree of freedom of a gas particle at temperature 376K is 3/2 kT, where k is the Boltzmann constant and T is the temperature in Kelvin.

Hence, the energy per degree of freedom at 376K is 3/2 x 8.6173 x 10-5 x 376 = 0.007845 ev.

What is temperature?

Temperature is a physical quantity which measures the degree of hotness or coldness of an object. It is measured on the Celsius (°C), Fahrenheit (°F) or Kelvin (K) scales. Temperature is related to the amount of thermal energy in a system, and is an important factor in many fields of science, such as physics, chemistry, meteorology, and engineering. Temperature affects the rate of many chemical reactions, and is a key factor in the functioning of living organisms. It also plays an important role in the Earth's climate and weather pattern.

Therefore, energy per degree of freedom at 376K is 3/2 x 8.6173 x 10-5 x 376 = 0.007845 ev.

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