25. A parent is standing next to their young child on a horse. What is the minimum coefficient of friction between the parental shoes and the floor when the child is on an:
A. inner horse?
B. outer horse?
C. General flooring specifications on carousels are for a coefficient of static friction to be 0.6. Is this specification met?
D. What is the maximum tangential velocity of the carousel for this coefficient of friction?
E. What is the maximum centripetal acceleration of the carousel for this coefficient of friction?

The earth is a sphere and the way, we can prove it , is attached in answer.

This are the two practical prove of spherical shape of earth.

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Answer:

Graph-

Explanation:

The graph best shows the velocity v of the clay ball from when it is dropped until it hits the ground is attached below.

Velocity is the time rate of change of displacement. The displacement and velocity both are vector quantities. They represent magnitude and direction as well.

Irene drops a clay ball at time t=0. The ball stops when it hits the ground.

When the clay ball drops, only force acting is due to acceleration due to gravity.

The velocity of the clay ball decreases with the time.

Thus, the graph best shows the velocity v of the clay ball from when it is dropped until it hits the ground is attached.

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Answer:

Henry Moseley

Explanation:

The above answer is incorrect because he was not the person who sorted the peroidic table by Atomic Number.

Henry Moseley is the first chemist to organize elements by atomic number. The correct option is C.

The atomic number is the number of protons in an atom's nucleus. The number of protons defines an element's identity.

Henry Moseley was the 1st chemist to classify elements based on their atomic number.

Thus, the correct option is C.

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A thin transparent surface will appear "dark" when the light waves reflected from it experience destructive interference.

This phenomenon occurs when two or more light waves overlap and interact, causing their amplitudes to cancel each other out. Destructive interference happens when the crest of one wave aligns with the trough of another wave, resulting in a reduced or completely diminished net amplitude.

In the case of a thin transparent surface, light waves can reflect off both the front and the rear surfaces. When the thickness of the surface is such that the path difference between these reflected waves is equal to half of the wavelength, the waves will be completely out of phase. This causes the waves to interfere destructively, and the surface appears dark to the human eye.

The specific conditions leading to destructive interference can depend on the angle of incidence, the wavelength of the light, and the thickness and refractive index of the material. This phenomenon can be observed in everyday life, such as with oil films on water or soap bubbles, which exhibit colorful patterns due to varying thicknesses and interference of light waves.

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Answer:

sa64

Explanation:

Given:

• Distance = 150 km

• Speed = 50 km/hr

Let's find the time it will take to cover the distance in minutes.

To find the distance, apply the formula:

Thus, we have:

The time in hours is 3 hours.

To convert the time from hours to minutes, we have:

60 minutes = 1 hour

3 hours = 3 x 60 = 180 minutes

Therefore, it time in minutes is 180 minutes.

ANSWER:

180 minutes

Answer:

Sample answer: part 1:

What was your hypothesis?

This is what you wanted to prove or study with the experiment. Reading the question I can see that the experiment seems to study the relation between the viscosity of honey and the temperature, so the hypothesis may be something like:

"The viscosity of honey decreases as temperature increases".

According to your data, do you think your hypothesis was correct?

Here you need to see your experimental data, probably, you found that yes, as you increase the temperature the viscosity decreases.

The last thing we need to do here is to summarize difficulties and problems that you had in the experiment, and propose how you could solve them in order to have a better experiment.

Obviously, this depends on how you performed the experiment, but for example, if you saw that the temperature of the honey increased too fast, you could say:

"one problem was that the temperature of the honey increased too fast"

And one way to solve that would be submerging the honey in a water bath so the temperature increases a bit slower.

part 2:

Viscosity depends strongly on temperature, but this relation depends also on the given material.

Generally, we would see that the viscosity decays exponentially as the temperature increases.

So for the first question:

What effect did the temperature have on the viscosity of the honey?

You should have seen that, as the temperature increased, the viscosity decreased.

Now, we need to give some practical examples where knowledge of viscosity is important.

The first one is for cleaning: We know that if we increase the temperature, the viscosity decreases. Thus if we have some object with some viscous thing on it, increasing the temperature will cause it to be easier to clean.

Another example is to store/transport viscous things, for example, honey, it is actually a lot easier to pour honey in bottles if you first heat it a little, so it becomes less viscous.

So there you have two examples where knowing about viscosity (and how it relates to temperature) may be important.

Explanation:

The voltage drop across the 18 kΩ resistor is 90 volts. This means that when a current of 5 mA flows through an 18 kΩ resistor, there is a potential difference of 90 volts across the resistor.

To calculate the voltage drop across a resistor, Ohm's Law can be applied. Ohm's Law states that the voltage (V) across a resistor is equal to the product of the current (I) flowing through it and the resistance (R) of the resistor. The formula for Ohm's Law is V = I * R.

Given:

Current (I) = 5 mA = 5 * 10^(-3) A

Resistance (R) = 18 kΩ = 18 * 10^(3) Ω

Using Ohm's Law, we can calculate the voltage drop (V):

V = I * R

= (5 * 10^(-3) A) * (18 * 10^(3) Ω)

= 90 V

Therefore, the voltage drop across the 18 kΩ resistor is 90 volts. This means that when a current of 5 mA flows through an 18 kΩ resistor, there is a potential difference of 90 volts across the resistor.

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Answer:

The net displacement is

\(R= \sqrt{A^2+B^2+2AB \cos \theta}\)

\(=\sqrt{15^2+25^2+2AB \cos 30^\circ} \\\\=\sqrt{225+625+ \cos30^0} \\\\=38.7m\)

Explanation:

Suppose that you walk 15 meters at 30 degrees as measured from the East. Then you walk another 25 meters at 60 degrees from the East what is your net displacement

Given data

A = 15 m

B = 25 m

Angle between the vectors A and B is θ = 30°

The net displacement is

\(R= \sqrt{A^2+B^2+2AB \cos \theta}\)

\(=\sqrt{15^2+25^2+2AB \cos 30^\circ} \\\\=\sqrt{225+625+ \cos30^0} \\\\=38.7m\)

Answer:

4 target heart rate. is the answer

Explanation:

hope its right

The dimension of a/b where x is the distance and t is the time is T

Given the expression

x = at + bt²

where

x is the distance

t is the time

Based on the homogeneity principle, the expression on the left-hand side must be equal to that on the right. Hence;

x = at

\(a = \frac{x}{t}\)

Since x is the distance and distance is measured in metres, the dimension equivalent will be the length 'L'

Since t is the time and time is measured in seconds, the dimension equivalent will be the seconds 'T'

\(a=\frac{L}{T}\)

Similarly;

x  = bt²

\(b=\frac{x}{t^2}\\b=\frac{L}{T^2}\)

Next is to get a/b;

\(\frac{a}{b} = \frac{L}{T} \div \frac{L}{T^2}\\\frac{a}{b} = \frac{L}{T}*\frac{T^2}{L} \\\frac{a}{b} =\frac{T^2}{T}\\\frac{a}{b} =T\)

Hence the dimension of a/b is T

In this time, the dog will cover a distance  = 8.51 m

Distance is the sum of an object's movements, regardless of direction. The amount of space that an object has travelled, regardless of where it started or ended, is referred to as distance. "Displacement" describes a change in an object's location. It has a magnitude and a direction, making it a vector quantity. An arrow pointing from the starting point to the finishing point serves as its symbol.For instance, if an object shifts from location A to position B, its position changes. Displacement is the term used to describe this shift in an object's position.first, we can figure out how long it will take for the owners to meet

if they start 8.2 m apart, and move toward each other at 1.3m/s, their closing velocity is 2.6m/s (since they each cover 1.3m/s, the distance between them reduces by 2.6m each s)

therefore, the time before they meet = \(\frac{ 8.2 m }{ 2.6m/s }\) = 3.15s

in this time, the dog will cover a distance \(2.7 m/s \times3.15\:m/s\)  = 8.51 m

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Answer:

E

Explanation:

All others conduct electricity and heat.

Answer:

E.Rubber

Explanation:

Rubber is the best insulator, they have them coated around electricity wires, while metals are good conductors.

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The answer is Aerodynamic Shaping.

Aerodynamic Shaping can reduce the drag force of an automobile and hence Increase the car's gas mileage. Integrated into the overall shape of an aerodynamic car are the wheel arches and headlights that reduce drag while also reducing wind resistance.

AeroDynamics is basically the study of how air move arround the things which deal with lift, drag, thurst and weight.

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By replacing the force system acting on the post with a resultant force and a couple of moments at point o we get total momentum of 1478.85 ft-lb.

As per the figure we have 3 forces: At the top 300lb left side 150lnb and at the middle 200lb.

first, we have to break down the forces into x and y components.

Now calculating each force separately:

∑Fₓ=300lb+cos 30°-150×4/3+200

=259.81-120+200

∑Fₓ=339.81lb.

Now, calculate the sum of y components.

∑Fy=300 sin 30°+150×3/5

∑Fy=300 sin 30°+90

∑Fy=240lb

Now we have to x and y components by these values we can find the actual force.

|F|=√Fx²+Fy²

|F|=√(339.81)²+(240)²                     α=tan⁻¹(∑Fₓ/∑Fy)

|F|=√115470.83+57600                      α=tan⁻¹(339.81/240)

|F|=√173070                                       α=35.23°

|F|=416.02 and 35.23°

the sum of moments at O

∑Mo=-Fx₃×2+Fx₂×4-Fx₁×6

∑Mo=-200(2)+4/5 150*4-3000cos30°(6)

∑Mo=-400+480-277.65

         =1478.85ftlb

∑Mo=1478.85ftlb

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(a) The centripetal acceleration of the child is 1.8225 m/s² toward the center of the circular path.

(b) The net horizontal force exerted on the child is 45.5625 N toward the center of the circular path.

(a) To calculate the centripetal acceleration (ac) of the child, use the formula:
ac = v² / r
where v is the speed (1.35 m/s) and r is the distance from the center (1.00 m).

ac = (1.35 m/s)² / 1.00 m
ac = 1.8225 m/s²

The direction of the centripetal acceleration is always toward the center of the circular path.

(b) To calculate the net horizontal force (Fc) exerted on the child, use the formula:
Fc = m * ac
where m is the mass of the child (25.0 kg) and ac is the centripetal acceleration (1.8225 m/s²).

Fc = 25.0 kg * 1.8225 m/s²
Fc = 45.5625 N

The direction of the net horizontal force is also toward the center of the circular path.

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The slowing of clocks in strongly curved space-time is known as gravitational time dilation.

A gravitational time dilation is a form of time dilation, an actual difference of elapsed time between two events as measured by observers situated at varying distances from a gravitating mass. It occurs because objects with a lot of mass create a strong gravitational field.

The gravitational field is really a curving of space and time. The stronger the gravity, the more spacetime curves, and the slower time itself proceeds.

This form of time dilation is also real, and it's because in Einstein's theory of general relativity, gravity can bend spacetime, and therefore time itself. The closer the clock is to the source of gravitation, the slower time passes; the farther away the clock is from gravity, the faster time will pass.

Hence, the right answer is gravitational time dilation.

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Answer: 1CM CUBE OF LEAD

Explanation:

The best describes the movement of the object between the times of 0 and 6 on the graph is moving at a constant speed. Therefore, option A is correct.

Moving occurs when an object's location compared to a fixed spot changes. Even seemingly stationary things shift. When one item moves in connection to another, we say it is moving relative to the other object.

Kinematics is the field of physics concerned with forces and their effects on motion, whereas dynamics is concerned with forces and their effects on motion. When a force pushes or draws on an item, it moves in the same way as the force.

Thus, option A is accurate because the object moves at a consistent pace between periods 0 and 6 on the graph.

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Reduce acceleration to avoid rear wheel traction loss on a slippery surface.

Rear wheel traction loss is also known as rear wheel skid which refers to a situation where the rear wheels of a vehicle lose grip or traction on the road surface.

This typically occurs when the amount of traction available between the tires and the road is insufficient to maintain control and traction during acceleration, braking, or cornering.

Rear wheel traction loss can result in a loss of vehicle control, causing the rear end of the vehicle to slide potentially leading to accidents or loss of control.

Thus, to avoid rear wheel traction loss on a slippery surface, it is important to reduce acceleration and maintain a smooth, steady speed.

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To avoid rear wheel traction loss on a slippery surface, it is important to increase the friction between the tires and the road. This can be achieved by using winter tires, reducing speed, and avoiding sudden acceleration or braking.

When driving on a slippery surface, such as ice or wet roads, it is important to take measures to maintain traction and avoid losing control of the vehicle. Traction refers to the grip or adhesion between the tires and the road surface. In order to avoid rear wheel traction loss on a slippery surface, it is necessary to increase the friction between the tires and the road.

One way to achieve this is by using winter tires, which are designed to provide better traction on snow and ice. Winter tires have a different tread pattern and rubber compound that helps them maintain grip in cold and slippery conditions.

Another important factor is reducing speed. Driving at a slower speed allows the tires to maintain better contact with the road surface, increasing traction and reducing the risk of losing control.

Avoiding sudden acceleration or braking is also crucial. Sudden acceleration can cause the tires to spin and lose traction, while sudden braking can lock up the wheels and result in a loss of control. Gradual and smooth acceleration and braking help to maintain traction.

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Answer:

m = 1,975 m / kg , b = 38.05 m

Explanation:

In this experiment, the elongation is plotted against the applied mass

getting a straight line

            y = m x + b

where b would be the initial length of spring let's calculate the slope for which we use two well separated points

           m = (56.3 -48.4) / (8 - 4)

           m = 1,975 m / kg

the equation remains

         y = 1,975 x + b

for x = 2 kg y = 42.0 m

we substitute in the equation

           42 = 1,975 2 + b

           b = 42 - 3.95

           b = 38.05 m

Shale,sandstone, and limestone are the most common types of sedimentary rocks.

Answer: the father of the nuclear physics is Ernest Rutherford

Explanation:

The phrase that describes the composition of the outer planets is 'are gaseous'. That is option A.

A planet is defined as the astronomical object that has enough gravity that causes it to revolve round about the sun.

There are various types of planet and they include the following:

Each planet is made up of and inner and outer geographical environment which in turn bears various unique characteristics.Most outer planets are made up of gaseous contents.

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Answer and Explanation: The geosphere interacts with the cryosphere when glaciers and sheets of ice from the cryosphere erode the rocks located on the geosphere. This happens as ice passes over the land and carries eroded rocks to new locations. The cryosphere can also cause soil to become icy and take hold of greenhouse gases from the atmosphere. The geosphere is the part of the Earth that has rocks, minerals, sand, and lava. The cryosphere has frozen water, ice, and glaciers. The cryosphere also interacts frequently with the hydrosphere because it draws water from the hydrosphere and freezes it during cold temperatures. Warmer temperatures cause the cryosphere to melt and release water back to the hydrosphere.

A resistor connected so that there is more than one path for the current is referred to as a parallel resistor configuration.

In this type of configuration, the resistors are connected side by side, with each resistor having its own path for the current to flow. The benefit of this configuration is that it allows for a greater amount of current to flow through the circuit, as the overall resistance is reduced. This is because the current can choose to flow through one or more of the resistors, depending on their individual resistance values. In addition, if one resistor fails or is removed from the circuit, the other resistors can continue to function properly.

However, it's important to note that the total resistance of the circuit will always be lower than the lowest individual resistance of the parallel resistors. This means that care must be taken to ensure that the combined resistance does not become too low, as it could result in excessive current flow and potential damage to the circuit or components. So, in short, a resistor connected so that there is more than one path for the current is a parallel resistor configuration that can provide increased current flow and redundancy in a circuit.

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