The enthalpy of formation of vacancies in pure copper is dh 1⁄4 86.9 kj mol 1. What is the fraction of sites vacant at 1084oc?

The required amount of power dissipated across the winding is calculated to be 60 W.

The resistance of the dc motor is given as (R) 240 ohms.

The voltage across the winding (V) is 120 v.

From ohm's law, we know that, mathematically, V = i R

Substituting the above values into the equation, we have,

V = i R

i = V/R = 120/240 = 1/2 A

The expression for power dissipated is known to be,

P = i² R

Putting the values into the above equation, we have,

P = i² R = (1/2)² 240 = 60 W

Thus, the amount of power dissipated across the winding is 60 W.

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4.9m/s^2 will be the acceleration of a skydiver when air resistance is half the weight of the skydiver

What is acceleration?

The rate at which velocity changes is called acceleration. Acceleration typically indicates a change in speed, but not necessarily. An item that follows a circular course while maintaining a constant speed is still moving forward because the direction of its motion is shifting.

Acceleration occurs in the direction of the velocity change, which is the same direction that the circular path's center of rotation points. The centripetal acceleration typically has a negative sign in vector form. This is due to the centripetal acceleration, which is along the radius vector pointing toward the center of the circular motion, being in the opposite direction to that of the radius vector.

Let m be the mass of the skydiver.

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

W = mg

W -Fr = ma

Fr = W/2

W/2 = ma

mg/2 = ma

a = g/2

a = 9.8/2 = 4.9m/s^2

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The speaker's power output is 392022.72W  if the sound intensity level is 108 dB at a distance of 17m.

Power output or acoustic power is the rate at which sound energy is radiated, reflected, communicated or got, per unit time.[1] It is defined[2] as "through a surface, the result of the power output , and the part of the molecule speed, at a guide on a superficial level toward the path typical toward the surface, coordinated over that surface."

The SI unit of Power output is the watt (W).[1] It connects with the force of the sound power on a surface encasing a sound source, in air. For a sound source, dissimilar to sound strain, Power output  is neither room-subordinate nor distance-subordinate.Power output  is a property of the field at a point in space, while sound power is a property of a sound source, equivalent to the complete power radiated by that source every which way. Power output going through an area is some of the time called sound motion or acoustic transition through that area.

We know that power output of sound waves is calculated by the formula=4πIr² where I is the sound intensity level and r is the distance.

Since,we have I=108dB and r=17m.Therefore,

P=4×3.14×108×17×17

=>P=1356.48×289

=>P=392022.72W

Hence,speaker's power output is 392022.72W.

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The acceleration with which a 50 kg person can slide down a rope without the rope breaking if the maximum tension the rope can withstand as the person slides down is 400 N is 2m/s².

The maximum tension that the rope can withstand, is T= 400N. The mass of the person,m= 50kg. So the upward force on the rope is 400N. And the downward force is 50g N and an acceleration also acts downwards as the person climbs down the rope. So, the net force downwards is 50(g+a). Now the acceleration of the person which the rope can withstand is, a=( 50g-400)/50 = (50×10 -400)/50= (500-400)/50 =100/50=2 m/s². So, the acceleration with which a 50 kg person can slide down a rope without the rope breaking is 2m/s².

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Let V = {0} consist of a single vector 0, and

define 0+0 = 0 and c0 = 0 for each scalar c in the

field F.

There are two operations on the set. All we have is

must validate each of the eight axioms.

VS1. The addition of commutativity. Indeed, x+y does

given that both are 0 and the sole vector in

the area.

The same justification holds true for VS2 and

from VS5 to VS8. Each axiom is a formula that

claims that one vector is equivalent to another, but since

only one vector, 0, is present, and both sides have it.

to act as the vector.

Axiom VS3 is slightly unique in that it states

that a vector 0 has a specific characteristic

However, V contains a vector of this type, namely 0. Likewise

Axiom VS4 states that there is a vector y for every vector x.

for x + y to equal 0.

Assume that y is 0, and that equation is true (since all vectors equal 0).

It is a vector space over F as a result.

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The correct option D .Any one of (i), (ii) and (iii): Any of them might be the trajectory of a positively charged particle that enters a uniform magnetic field at uniform velocity.

We are aware that: F=q(vB) describes the magnetic force acting on such a moving charge in such a magnetic field.

The magnetic field's strength, velocity, and direction all affect the particle's course. Given the direction of all these values, there are three possible scenarios.

Case I: Equation holds true when the particle travels in the magnetic field's direction.

(1) changes to F=0.

As a result, the particle travels along the into because in a straight line.

Case ii. The force develops perpendicular towards the direction of magnetic field when the particle travels perpendicular to it.

As a result, the particle's route is circular.

Case iii) The parallel component of the velocity direction tends to drive the particle all along direction of the magnetic field when the velocity direction has both parallel as well as perpendicular components to it. The particle is moved in a circular motion by the perpendicular component.

As a result, the particle's route is helix-shaped.

Consequently, a positively charged particle's trajectory can be a straight line, a circle, or a helix when it enters a uniform magnetic field having uniform velocity.

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The lawn mover is exerting a force of 30 N on the man.

Given, a man weighing 60 kg is moving a 30 kg lawnmower.

Thus, the lawnmower's force is calculated as 30N - 60N = -30N.

A force is something that pushes or pulls an object. The objects' interactions with one another are what causes push and pull. Force can also be expressed using words like stretch and squeeze.

Force is an external agent that has the power to alter a body's resting or moving state. It has a size and a movement.

The direction of the force is referred to as the force's direction, and the application of force is the point at which the force is applied.

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0.8 μC is the final charge on the third sphere

Define electric charge

The physical quality of matter—its electric charge—is what causes it to feel a force when exposed to an electromagnetic field. You can have a positive or negative electric charge (commonly carried by protons and electrons respectively, by convention). Unlike charges attract one another while like charges repel one another. Neutral refers to an object that carries no net charge.

Since the 3 objects are similar and conductors, charge can move freely among them. Since the four objects are identical, the overall charge disperses among them as equally as possible.

q1, q2, q3 are same

Q/3 will be value of q

Q is 7.8-1.4-4.0 i.e. 2.4 μC

q will be 2.4/3 i.e. 0.8 μC

The charge q is positive so we have defecit of electrons

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The equivalent of 8 CELSIUS in F is 46.4 F. In 8 C, the majority of individuals dress warmly and wore jackets. You are one of those folks who can endure the cold without the need of a jacket. Freezing is 8 C.

MetaPlus®, a patented mixture found in CELSIUS, activates thermogenesis to quicken metabolism and raise caloric burn. Your metabolic rate is increased by Green Tea, EGCG, Tadalafil, Guarana Seed Extract, Taurine, and Ginger Root Extract in combination with other nutrients in CELSIUS.

The Celsius scale is often used to measure the temperature  The Celsius scale was developed by Swedish astronomer Anders Celsius. The water temperature (°C) on a thermometer is the melting point liquid clear water at standard pressure and sea level.

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The electric field at x=5.00 cm in Figure 18.52(a) can be found using the formula for the electric field due to a point charge: 5.62 x 10⁵ N/C

E = k × q / x²,

where k is the Coulomb constant, q is the charge, and x is the distance from the charge. Substituting the given values, we get: E = (8.99 x 10⁹N m²/C²) ×(1.57 x 10⁻⁶ C) / (0.05 m)² = 5.62 x 10⁵ N/C

When charge is present in any form, a point in space has an electric field that is connected to it. The value of E, often known as the electric field strength, electric field intensity, or just the electric field, expresses the strength and direction of the electric field. Without any precise information of what generated the field, simply knowing the value of the electric field at a certain location is sufficient to predict what would happen to electric charges nearby.

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-3m/s is the rate of change of the distance between the cars at that instant

What does the word "speed" mean?

Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path.

First car's speed is 5 m/s.

The second car is moving at 8 m/s.

The first car is 15 meters from the intersection at a specific moment.

Second car is also 20 meters from junction at the same moment.

the car's speed, expressed as dx/dt, or the rate of change of distance.

Their distance from one other using the Pythagoras theorem is given as

Z²=X²+Y²

Z²=15²+20²

Z²=225+400

Z²=625

Z=√625

Z=25m

Taking a step in that direction

Suppose the first vehicle is going in the direction of positive x, then

dx/dt=5m/s

The second vehicle will also be travelling against y.

dy/dt=-8m/s

Let's apply the Pythagoras formulas above to determine dz/dt presently.

x²+y²=z²

differentiating in light of t

2dx/dt+2dy/dt=2dz/dt

Multiply through by 2

dz/dt=dx/dt+dy/dt

dz/dt=5-8

dz/dt=-3m/s

The speed at which the distance between the two bodies change is -3m/s

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Due to the possibility of error, experimental measurements do not give the true value of a physical quantity

Experimental measurements are always subject to error, and as a result, they do not give the "true" value of a physical quantity. Instead, experimental measurements provide an approximation of the true value, which is influenced by many factors such as the precision and accuracy of the measurement apparatus, environmental conditions, and observer bias.

In conclusion, experimental measurements do not give the true value of a physical quantity, but they provide an estimate of its value with associated uncertainty, which is useful for making predictions and testing scientific theories.

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The magnitude of the gravitational acceleration on this planet can be calculated using the equation $g = 4\pi^2\frac{L}{T^2}$, where $L$ is the length of the pendulum in meters and $T$ is the time in seconds it takes for the pendulum to complete one full swing cycle.

In this case, the length of the pendulum is $52.0 \textrm{ cm}$, which is equal to $0.52 \textrm{ m}$, and the time it takes to complete one full swing cycle is $136 \textrm{ s}$.

Plugging these values into the equation gives us $g = 9.8 \textrm{ m/s}^2$. Therefore, the magnitude of the gravitational acceleration on this planet is $9.8 \textrm{ m/s}^2$.

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Answer:

the combined speed of the two railroad cars after the collision is 4/3 m/s.

Explanation:

The combined speed of the two railroad cars after the collision can be calculated using the conservation of momentum principle.

Let's assume the combined speed of the cars after the collision is v'. Then, using the equation for momentum, p = m * v, where m is the mass of each car and v is the velocity of each car, the momentum of each car before and after the collision can be calculated as:

Before the collision:

m1 = 4000 kg, v1 = 2 m/s

p1 = m1 * v1 = 4000 kg * 2 m/s = 8000 kg m/s

After the collision:

m2 = 6000 kg, v2 = 0 m/s

p2 = m2 * v2 = 6000 kg * 0 m/s = 0 kg m/s

Since momentum is conserved, the momentum before the collision must equal the momentum after the collision:

p1 = p2

So,

8000 kg m/s = 6000 kg * v'

Solving for v', we find that:

v' = 8000 kg m/s / 6000 kg = 4/3 m/s

Therefore, the combined speed of the two railroad cars after the collision is 4/3 m/s.

Permeability is a measure of a material's ability to: transmit the fluids.

Measure of the ease of flow of a fluid through a porous solid is known as permeability. Rock may be extremely porous, but if pores are not connected, it will not have permeability.

Permeability is determined by applying head and determining depth of penetration or the amount of liquid or gas passing through sample.

Widely used are permeability μ = B0/H0 (B0 is the magnetic flux density B at the point P and H0 is the magnetic field H ) and differential permeability μd = dB/dH.

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The observed speed of the ball is (2.92 ± 0.02) cm/s

Speed is calculated as follows: speed = distance/time.The most often used measure of speed in daily life is the kilometre per hour (km/h), or miles per hour in the US and the UK. The SI's unit of speed is the metre per second (m/s) (mph). We may determine the ball's actual speed using the values provided by computing the following:

[tex]distance = 33.6 ± 0.2 cm[/tex]

[tex]time = 11.49 ± 0.02 s[/tex]

speed = distance / time

          [tex]=\frac{ (33.6 ± 0.2) cm } {(11.49 ± 0.02) s}[/tex]

We may calculate the speed calculation's uncertainty as follows by using the most likely uncertainty (0.5 times the smallest uncertainty):

distance uncertainty = 0.2 cm

uncertainty in time = 0.02 s

Speed uncertainty is equal to (distance uncertainty) / (time uncertainty) 0.5 * (smallest uncertainty)

     [tex]=\frac{{ (0.2) }} {(11.49) }}{± 0.5 * (0.02)}[/tex]      

      [tex]=0.01744 ± 0.01 cm/s[/tex]

Therefore, the observed speed of the ball is (2.92 ± 0.02) cm/s.

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The speed of the box when it slid off the table is 9.47 m/s².

What is Projectile Motion?

A particle that is flung obliquely toward the surface of the earth travels along a curved route with constant acceleration that is pointed in the direction of the planet's center. Such a particle's motion and trajectory are both referred to as projectile motion.

The only force acting on a particle when it is launched into the air at some speed is the acceleration due to gravity (g). The downward motion of this acceleration is vertical. The horizontal direction does not experience any acceleration, hence the particle's horizontal velocity stays constant.

It is given that a box is knocked off a 1.4 m high table and then strikes the floor 2.7 m from the edge of the table.

[tex]\implies \triangle x_{y}=-1.4m[/tex] and [tex]\triangle x_{x}=2.7m[/tex]

Here, the acceleration of gravity, g = a = -9.81 m/s²

Under projectile motion, the vertical motion equations corresponding to the given problem is:

[tex]\triangle x_{y}=\frac{1}{2}at^{2}+V_{iy}t[/tex]

Since, [tex]V_{iy}=0[/tex], we get t as

[tex]t=\sqrt{\frac{2 \triangle x_{y} }{a} }[/tex]

Substituting the given values, we get

[tex]t=\sqrt{\frac{2(-1.4)}{-9.81} } \\\implies t=\sqrt{\frac{-2.8}{-9.81} }\\\implies t=0.285s[/tex]

Also, we know that, [tex]\triangle x_{x}=V_{ix} \times t[/tex]

Now, calculating the speed, we get

[tex]V_{ix}=\frac{\triangle x_{x} }{t} \\\implies V_{ix} =\frac{2.7}{0.285} \\[/tex]

[tex]\implies V_{ix}=9.47 m/s^{2}[/tex]

Hence, the speed of the box when it slid off the table is 9.47 m/s².

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The other two interior angles are calculated to be both 56.0 degrees.

The inner of the two angles formed where two sides of a polygon come together are called interior angles.

Given if two of the interior angles of a triangle are equal, then the third interior angle must be different. Let's call the equal angles "x". The sum of all interior angles of a triangle is 180 degrees, so:

x + x + 68.0 = 180

2x + 68.0 = 180

Subtracting 68.0 from both sides,

2x = 180 - 68.0 = 112.0

x = 56.0

So, the other two interior angles are both 56.0 degrees.

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Its speed when its height was half that of its starting point is 28.28 m/s

v = 36 m/s is the roller coaster's final speed.

applying the fundamental motion equation;

V² = U² + 2gh

where;

V is the roller coaster's final speed.

U is the roller coaster's starting speed, which is 0

h is the height achieved at a specific speed.

40² = 0 + (2 x 9.8)h

1600 = 19.6 h

h = 1296/19.6

h = 81.63 m

h₂ = 1/2 h when its height was half that of its beginning point.

h₂ = ¹/₂(81.63 m) = 40.81 m

At h = 40.81 m, V = ?

V² = U² + 2gh

V² = 0 + 2 x 9.8 x 40.81

V² = 800

V = √800

V = 28.28 m/s

As a result, it moved at a speed of 28.28 m/s when its height was half that of its starting point.

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The mass of the skateboard is approximately 12.8 kg.

Mass can be defined as the measure of the amount of matter in a body. The SI unit of mass is Kilogram (kg).

The momentum of the student + skateboard before and after the jump must be the same, since there are no external forces acting on the system.

Momentum before jump = Momentum after jump

m_student * v_student_before + m_skateboard * 0 = m_student * v_student_after + m_skateboard * v_skateboard

Rearranging and solving for m_skateboard:

Therefore, The mass of the skateboard is approximately 12.8 kg.

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The spring constant of the gun 80 N/m.

The formula for finding the spring constant is

k=(2mv^2)/x

where m is the mass of the ball, v is the speed of the ball, and x is the distance the spring is compressed.

In this case, m=200 g, v=2.0 m/s, and x=15 cm.

Plugging these values into the formula, we get

k=(2*(200g)*(2.0m/s)^2)/(15 cm)

k=(2*0.2 kg*(4 m^2/s^2))/(0.15 m)

k=80 N/m

What is mass?

Mass is an amount of matter or energy that an object contains. It is measured in kilograms, grams, or pounds. Mass is different from weight, which is a measure of the force an object exerts on the environment due to gravity.

Therefore, The spring constant of the gun 80 N/m.

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A study that uses two sets of variables and a scientific methodology is called experimental research. You use the first set as a reference point to calculate the differences between the second set. For instance, quantitative research techniques involve experimentation. You can specify and set your own experimental parameters. The highest temperature to which a solution can be heated, for instance. Although classification factors cannot be defined or set, they can be recognized, and your samples can be chosen in accordance with them. such as a person's gender or age. True experiments must include manipulation, control, random assignment, and random selection. The most important aspects are the manipulation and control of these elements. The Experimental Psychology Method by Using an experimental strategy, one variable is changed to see if it has an impact on another. In order to test a hypothesis, this strategy employs controlled research methods and random subject selection.  T Therefore, any variable in a research project that is actually kept constant is referred to be a control variable. Despite not being a study-relevant variable, it is controlled anyway because it might have an impact on the results. 01-Mar-2021

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An experimental factor (also known as an independent variable) is a variable that is manipulated by the experimenter in order to observe its effect on the outcome of the experiment.

Experimental factors are variables that are controlled and manipulated by a researcher during an experiment. These factors can be either independent variables, which are the conditions the researcher changes, or dependent variables, which are the behaviors or outcomes that are observed and measured as a result of changing the independent variables. Experimental factors are important in determining the results of an experiment, and it is important for researchers to have an understanding of the potential effects of different combinations of factors.

It is the variable that the researcher changes or controls in order to measure the effect it has on the dependent variable, which is the variable being measured.

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The stopping distance is 8.33.

Let's use the equation s = v0t + 1/2at^2 to solve for the stopping distance.

s = 8.33t + 0.5(0)(t^2)

s = 8.33t

Since the acceleration is 0, the stopping distance is equal to the total distance the car traveled while its velocity was 8.33.

What is distance?

Distance is the amount of space between two points. It can be measured in various units such as miles, kilometers, feet, and meters. Distance can also be used to describe the length of time or amount of effort it takes to reach a certain point. Distance can be used in reference to physical space or to abstract concepts.

Therefore, The stopping distance is 8.33.

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The closest distance is 8.4*10^-15m.

So for alpha particle The closest distance is 8.4*10^-15m.

The closest distance between two objects is the distance between their centers if they are circumscribing. Objects can be geometric shapes or physical particles with well-defined boundaries. The closest distance is sometimes called the contact distance.

Given the,

Alpha particles have a distance of 11 Mev from near.

KE energy of alpha particles in terms of system potential energy

11*10^6*1.6*10^-19=PE at closest distance

So d= 8.4*10^-15 m

After resolution. The closest distance is 8.4*10^-15m.

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The angle v with arrow makes with the positive direction of the x axis at   t = 9.00 s is -86.23° degrees from the +x axis.

One of the subatomic particles with mass is the electron. The kinetic energy of any moving object is equal to 1 / 2 mv ², where m is the object's mass and v is its velocity. Electron speed V = 1 / 2 mqv ² is an electromagnetic equation.

a) v with arrow(t) = dr with arrow/dt

                                = 2.00i + (-14.00t)j + 0k

b) v with arrow (t = 9.00) = 2.00i + (-14.00  9.00)j + 0k

                                 = 2.00i - 126.00j

c) the magnitude of v with arrow (t = 9.00)

                          = √(2.002 + (-126.00)2)

                                      = 126.00

d) tan(theta) = vy/vx

                               = -126.00/2.00

                              = -63.00,

θ = atan(-63.00)

                                  = -86.23° degrees.

So, the angle v with arrow makes with the positive direction of the x axis at

                        t = 9.00 s is -86.23 degrees from the +x axis.

Because of its negative charge, an electron will move in the opposite direction of the electric field. As a result, it will move to the left. The electron might also be thought of as being drawn to the positively charged plate.

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Answer:

The displacement can be represented as vectors in the x and y direction.

The displacement 3.62 m south can be represented as a vector of magnitude 3.62 m and direction -90°.

The displacement 8.10 m northeast can be represented as a vector of magnitude 8.10 m and direction 45°.

The displacement 14.6 m west can be represented as a vector of magnitude 14.6 m and direction -180°.

We can find the x and y components of each displacement vector, and then add those components to find the x and y components of the resultant displacement.

x component of the first displacement: 3.62 * cos(-90°) = 0 m

y component of the first displacement: 3.62 * sin(-90°) = -3.62 m

x component of the second displacement: 8.10 * cos(45°) = 5.65 m

y component of the second displacement: 8.10 * sin(45°) = 5.65 m

x component of the third displacement: 14.6 * cos(-180°) = -14.6 m

y component of the third displacement: 14.6 * sin(-180°) = 0 m

The x and y components of the resultant displacement are the sum of the x and y components of each individual displacement:

x component of the resultant displacement: 0 + 5.65 - 14.6 = -8.95 m

y component of the resultant displacement: -3.62 + 5.65 + 0 = 2.03 m

We can use the Pythagorean theorem to find the magnitude and direction of the resultant displacement:

resultant displacement = √(x^2 + y^2) = √(-8.95^2 + 2.03^2) = 9.06 m

direction = tan^-1(y/x) = tan^-1(2.03/-8.95) = 125.3°

So, the resultant displacement is 9.06 m at an angle of 125.3° with respect to the x-axis (east).

Explanation:

According to a test taker's average test score is indicated by an IQ score of 100 on the Stanford-Binet and Wechsler intelligence test.

A common IQ test, like the Stanford Binet IQ test or the Wechsler Intelligence Scale, is used to gauge a person's level of intellectual functioning. 100 is the global average. Low IQ scores refer to those with scores below 70. Professionals assess the person's adaptable behaviour as well.

The average result for all test takers of the same age is 100.

a test that is given to each person individually to assess their level of intelligence by testing their ability to solve problems, develop concepts, reason, pay attention to detail, and do other intellectual tasks.

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As time increases, the distance between the skydivers decreases, until they eventually collide.

define distance ?

Distance is a scalar quantity that represents the magnitude of separation between two points in space. It can be thought of as the length of the shortest path between the two points. Distance can be calculated by using the Pythagorean theorem or other methods, depending on the geometry of the situation. The unit of distance can be meters, kilometers, miles, or any other unit of length.

The vertical distance between the two skydivers changes over time as they both fall with the same acceleration. If we consider that the initial vertical distance between them is d0, then the vertical distance d between them at time t can be calculated using the following formula:

d = d0 - g * t^2 / 2

where g is the acceleration due to gravity (approximately 9.8 m/s^2) and t is the time elapsed.

Since both skydivers have the same acceleration, they both fall at the same rate and the vertical distance between them decreases linearly with time. As time increases, the distance between the skydivers decreases, until they eventually collide.

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The tank will contain 350 lb of salt when it is full of brine.

Let x be the amount of salt in the tank when it is full.

Then:

x = 50 + 1 * (400 - 100) = 50 + 300 = 350 lb

So, the tank will contain 350 lb of salt when it is full of brine.

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Rotational speed refers to the number of rotations an object completes in a given time period. The rotation speed for a person at latitude 72°N is approximately 522 km/hour.

Explanation:

Given,

Latitude = 72°N

The rotation speed can be calculated using the following formula:

V = ω × R

where:

V is the rotation speed,

ω is the angular velocity,

R is the radius of the Earth at the given latitude.

The angular velocity of the Earth can be approximated as the rotation rate of the Earth, which is 360 degrees per 24 hours or 2π radians per 24 hours.

ω = (2π radians) / (24 hours × 3600 seconds/hour) ≈ 7.292 × 10⁻⁵ radians/second

The radius of the Earth at latitude 72°N can be approximated as the product of the equatorial radius (6,378 km) and the cosine of the latitude (cos(72°)).

R = (6,378 km) × cos(72°)

V = (7.292 × 10⁻⁵  radians/second) × (6,378 km) × cos(72°)

V = (7.292 × 10⁻⁵  radians/second) × (6,378 km) × 0.309

V = 0.145 km/second

To convert the rotation speed from km/second to km/hour, multiply by 3600 (the number of seconds in an hour):

V = 0.145 km/second × 3600 seconds/hour

V = 522 km/hour

Learn more about rotation speed, here:

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