She varies the level of noise in the environment and records the blood pressure of each participant. In this experiment, the level of noise is the

Answer:

5.03×10¯⁷ N

Explanation:

From the question given above, the following data were obtained:

Mass of the person (M₁) = 55 Kg

Mass of the car (M₂) = 1234 Kg

Distance apart (r) = 3 m

Gravitational constant (G) = 6.673×10¯¹¹ Nm²/Kg²

Force (F) =?

The force between the person and his car can be obtained as follow:

F = GM₁M₂ / r²

F = 6.673×10¯¹¹ × 55 × 1234 / 3²

F = 6.673×10¯¹¹ × 67870/ 9

F = 5.03×10¯⁷ N

Thus, the force between the person and his car is 5.03×10¯⁷ N

The relative density of the substance is equal to the density of the substance concerning the density of the reference substance.

The relative density of the substance is known as the specific gravity.

Hence, option B is the correct answer.

The starting system permits the driver to turn the ignition switch to activate an electric motor, solenoid switch, wiring, and battery.

In vehicles, the starting system is a fundamental part for the operation of the electrical system, its main function is to start the vehicle by providing it with the necessary electrical current through the ignition switch in which the key is inserted and must be turned to the on position.

In physics the electric current is the magnitude that expresses the amount of electric charge or electric current in coulomb (c) that passes through an electrical conductor in a given time in seconds (s). Its unit of measurement in the international system is the Ampere (A).

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Solve the given problem as

Answer:

Hi! These graphs I'm providing below are the answer to this problem, as well as the free response sections. I'll attach them below for you.

Hope this helps! :)

EDIT: I didn't realize that I had solved the problem wrong, so I deleted my answer. The other answer to this question is really good so look at that one, not this. I'm so sorry!

B. False. The statement "Any object free to rotate about a pivot will come to rest with its center of gravity at the pivot" is incorrect. In fact, an object free to rotate about a pivot will come to rest with its center of mass directly below the pivot, not necessarily at the pivot itself.

This is because when the object rotates, its weight creates a torque that causes it to rotate until its center of mass is directly below the pivot. To understand this concept, consider a simple pendulum consisting of a mass suspended from a pivot point by a string. When the pendulum is released, it swings back and forth, eventually coming to rest with the mass hanging directly below the pivot point. This occurs because the force of gravity acting on the mass creates a torque that causes the pendulum to swing until its center of mass is directly below the pivot point. In summary, an object free to rotate about a pivot will come to rest with its center of mass directly below the pivot, not necessarily at the pivot itself. option B

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The factor that increases along faults and leads to rock breaking is D. stress.

Stress builds up along faults over time as tectonic plates move and interact with each other. This accumulated stress eventually causes the rocks to break, which results in an earthquake.

earthquake, any sudden shaking of the ground caused by the passage of seismic waves through Earth’s rocks. Seismic waves are produced when some form of energy stored in Earth’s crust is suddenly released, usually when masses of rock straining against one another suddenly fracture and “slip.” Earthquakes occur most often along geologic faults, narrow zones where rock masses move in relation to one another. The major fault lines of the world are located at the fringes of the huge tectonic plates that make up Earth’s crust.

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Answer is d. Stress

Answer:

theory is cxorrect

Explanation:

The Earth rotates on its axis every 24 hours (relative to the Sun) and revolves in orbit around the Sun once every year.

The most direct evidence of daily rotation is via a Foucault pendulum, which swings in the same plane as the Earth rotates beneath it. At either pole, the swinging plane mirrors the Earth's 24 hour period. Some rotation is observed at all other locations on the Earth's surface as well, except for the equator.

The most direct observational evidence for Earth's orbital motion is the apparent shift of nearby stars after six months, as the Earth moves from one side of its orbit to the other. Because of the large distance to even the nearest start, this parallax shift is too small to been seen without a telescope.

So the Earth rotates around its axis as it revolves around the sun. It takes the Earth 365 days, or one year, to complete a revolution. Leftover momentum from when planets were forming makes the Earth, and all planets in the solar system, rotate and revolve.

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We have to use Newton's Second Law, knowing that the friction force is

Then,

Because the friction force is against the movement.

We know that m = 5kg, F = 75N, friction = 10.

Let's solve for a

The acceleration is 13 meters per square second.

Also, the force acting on the object is 65N because we have a net force present there.

Answer:

Select the crown at the bottom of an answer where the speech bubble icon is.

Answer:

Explanation: A ball is thrown into the air at an angle of 50 degrees with a horizontal, and initial velocity of 12m/s. (i) we to find the total time of the flight, and (ii) maximum height that the ball reaches

(i) Total flight time:

To find the total time, we much keep in mind that it is the time that the bill would take to reach the same height level as its starting height, the equation that will be used is as follows:

By setting equation (1) equal to zero and solving for the "t" , the total flight time can be solved, it can be done as follows:

(ii) Maximum height of the ball:

The maximum height that the ball can reach would be attained in half of the total flight time, therefore we need to simply find the y(t) at half of the total flight time, this is done as follows:

The resistance of a conductor that carries a current of 120 amperes when the potential difference between its ends is 240 volts = 2 Ω

Electrical resistance is the force that opposes the flow of current, it's a component that can reduce the speed and quantity of the flow of electrons in an electric circuit.

The formula for electrical resistance can be seen to have several components, namely R is the resistance (Ω), V is the voltage (V), and I is the current strength (A).

The equation:

R = V/I

We have,

Current strength = 120 A

The potential difference between its ends  = 240 V

So, the resistance of a conductor that carries a current of 120 amperes when the potential difference between its ends is 240 volts:

R = 240 V / 120 A

= 2 Ω

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Answer:

709.5 cal

Explanation:

masa m de la barra de aluminio = 100 g

temperatura ambiente = 27 ° C

Asumiremos que la barra de aluminio está en equilibrio térmico con el ambiente.

Esto significa que la temperatura inicial de la barra es de 27 ° C

temperatura final a la que la barra debe calentarse = 60 ° C

el aumento de temperatura ΔT será

ΔT = 60 ° C - 27 ° C = 33 ° C

capacidad calorífica específica c del aluminio = 0.215 cal/g°C

Calor C requerido = mcΔT

C = 100 x 0.215 x 33 = 709.5 cal

The gauge pressure required to give an area of contact of 106 cm2 for each tire is 35 lb/in².

Force  is a push or pulls upon an object because of the object's interplay with some different object. stress is a energy that could change the movement of an object. A pressure can cause an object with mass to alternate its pace, i.e., to reinforce up. strain also can be described intuitively as a push or a pull. A force has every significance and route, making it a vector amount.

Calculation:-

P = F/A

The force acting on the car is supported equally on four tires

The mass on each tire is ;

m = Total mass/4

= 1440 kg/4

= 360 kg

Thus, the force on each tire is

F = mg

  = (360 kg)(9.8)

 = 3528 N

The gauge pressure is 35 lb/in²

The phrase 'Force' has a unique meaning. At this degree, it is absolutely appropriate to describe a force as a push or a pull. A force is exerted on one object through another. The concept of a force isn't always restricted to living matters or non-living matters.

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If the resistance remains constant and the voltage doubles, the power will increase by a factor of 4 (option E)

The following data were obtained from the question:

P = V² / R

Resistance is constant, we have

V₁² / P₁ = V₂² / P₂

V² / P = (2V)² / P₂

V² / P = 4V² / P₂

Cross multiply

V² × P₂ = P × 4V²

Divide both side by V²

P₂ = P × 4V² / V²

P₂ = P × 4

From the above, we can conclude that the power will increase by a factor of 4 (option E)

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The gas is cooled at constant pressure until the temperature is  10°C, then the final volume after calculating it comes out to be 43.80 m³. hence, the correct option is (B).

To solve this problem, we can use the ideal gas law, which states:

PV = nRT

Where:

P is the pressure

V is the volume

n is the number of moles of gas

R is the ideal gas constant

T is the temperature

In this case, we are given the initial volume (V1 = 50.0 m³), initial temperature (T1 = 50°C), and final temperature (T2 = 10°C). We need to find the final volume (V2).

First, we convert the temperatures to Kelvin since the ideal gas law requires temperature in Kelvin:

T1 = 50°C + 273.15 = 323.15 K

T2 = 10°C + 273.15 = 283.15 K

Since the pressure is constant in this problem, we can simplify the ideal gas law to:

V1/T1 = V2/T2

Now, let's plug in the known values:

50.0 m³ / 323.15 K = V2 / 283.15 K

To solve for V2, we can cross-multiply and then divide:

V2 = (50.0 m³ / 323.15 K) * 283.15 K

V2 = (50.0 m³ * 283.15 K) / 323.15 K

V2 = 14157.5 m³ / 323.15

V2 ≈ 43.82 m³

Therefore, the final volume of the gas is approximately 43.82 m³. The closest option to this value is 43.80 m³.

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The rate at which water is leaking out of the cone is approximately 16.76 cubic feet per minute (ft^3/min).

To determine the rate at which water is leaking out of the cone, we need to use the formula for the volume of a cone:

V = (1/3)πr^2h

where V is the volume of the cone, r is the radius of the base, and h is the height of the cone.

We also need to use the formula for related rates:

dV/dt = (∂V/∂h)(dh/dt)

where dV/dt is the rate at which the volume of the cone is changing, (∂V/∂h) is the partial derivative of the volume with respect to the height, and dh/dt is the rate at which the height of the water level is changing.

First, we need to find the radius of the cone. We can do this by using the fact that the depth of the water is 8 ft:

h = 8 ft

The cone is similar to the larger cone, so the ratio of the corresponding dimensions is the same:

r/h = 2/3

r = (2/3)h = (2/3)(8 ft) = 16/3 ft

Now we can find the volume of the cone at any time:

V = (1/3)πr^2h

V = (1/3)π[(16/3 ft)^2](h)

Next, we need to find the rate at which the height of the water level is changing:

dh/dt = -3 in/min

We need to convert this to feet per minute, since the other measurements are in feet:

dh/dt = -0.25 ft/min

Now we can find the rate at which water is leaking out of the cone:

dV/dt = (∂V/∂h)(dh/dt)

dV/dt = (2/3)πr^2(dh/dt)

dV/dt = (2/3)π[(16/3 ft)^2](-0.25 ft/min)

dV/dt ≈ -16.76 ft^3/min

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The correct answer is 378000 km.

The speed of light is the rate at which light waves move through distinct substances. In instance, it has now been established that the speed of light in a vacuum is 299,792,458 metres per second.

Using the equation

distance = speed × time,

the total distance travelled is calculated.

Consequently, the overall distance travelled is

Distance = ( 3.00 × 10^8 m/s ) ( 2.52 )

= 756000000 m

The total distance travelled divided by two determines the distance between the Earth and the Moon.

Distance between earth to moon = 756000000/2

= 378000000 meters

= 378000 km.

Approximately 384 thousand kilometres separate the Earth and the Moon.

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Answer:

If an ideal gas does positive work on its surroundings, we can assume that the gas has undergone a decrease in its internal energy. This is based on the first law of thermodynamics, which states that the change in the internal energy of a system is equal to the heat added to the system minus the work done by the system.

When an ideal gas does positive work on its surroundings, it means that the gas has transferred energy to the surroundings by performing work. This results in a decrease in the internal energy of the gas because it has lost some of its energy to the surroundings.

Therefore, we can assume that the temperature of the gas has decreased because the internal energy of the gas is proportional to its temperature. This assumption is based on the ideal gas law, which states that the pressure, volume, and temperature of an ideal gas are related. If the pressure and volume of the gas remain constant, a decrease in the temperature of the gas will result in a decrease in its internal energy.

In summary, if an ideal gas does positive work on its surroundings, we can assume that the gas has undergone a decrease in its internal energy and its temperature has decreased.

Explanation:

The ball will hit the ground after approximately 1.88 seconds and at a horizontal distance of approximately 34.15 ft away.

a. To find the position vector of the particle at time t, we can use the kinematic equation for motion with constant acceleration. The position vector ⃗r(t) is given by ⃗r(t) = ⃗r₀ + ⃗v₀t + 0.5⃗at², where ⃗r₀ is the initial position vector, ⃗v₀ is the initial velocity vector, ⃗a is the acceleration vector, and t is the time.

Plugging in the values, we have ⃗r(t) = (5, 0, 4) + (0, 0, 7)t + 0.5(-11, -1, -5)t², which simplifies to ⃗r(t) = (5 - 11t^2, -t, 4 - 5t^2). This gives the position vector of the particle at any given time t.

b. For the baseball, we can analyze its motion using projectile motion equations. The vertical and horizontal motions are independent of each other, except for the initial velocity. The vertical motion is affected by gravity, with an acceleration of -32 ft/s².

Using the given initial speed of 26 ft/s and the launch angle of 20 degrees, we can decompose the initial velocity into its vertical and horizontal components. The vertical component is 26 * sin(20°) ft/s, and the horizontal component is 26 * cos(20°) ft/s.

To find the time of flight, we can use the equation for vertical motion: y = y₀ + v₀yt + 0.5at². The initial vertical position is 40 ft, the initial vertical velocity is 26 * sin(20°) ft/s, and the vertical acceleration is -32 ft/s². Solving for t, we get t ≈ 1.88 seconds.

To find the horizontal distance, we use the equation x = x₀ + v₀xt, where the initial horizontal position x₀ is 0 ft (assuming the ball is thrown from the stands), the initial horizontal velocity v₀x is 26 * cos(20°) ft/s, and the time of flight t is approximately 1.88 seconds. Solving for x, we find x ≈ 34.15 ft.

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The amount of substance affects the total energy through the concept of molar heat capacity. Molar heat capacity is defined as the amount of heat required to raise the temperature of one mole of a substance by one degree Celsius. Therefore, the more substance there is, the more heat energy is required to raise its temperature.

For example, if we have one mole of a substance, it will require a certain amount of energy to raise its temperature by one degree Celsius. However, if we have two moles of the same substance, it will require twice as much energy to raise the temperature of the larger amount by the same one degree Celsius.

Additionally, the amount of substance can affect the total energy through the concept of specific heat capacity. Specific heat capacity is defined as the amount of heat required to raise the temperature of one unit of mass (usually one gram) of a substance by one degree Celsius. Therefore, if we have more mass of a substance, it will require more energy to raise the temperature of the larger amount by the same one degree Celsius.

In summary, the amount of substance affects the total energy through the concepts of molar heat capacity and specific heat capacity, which determine how much energy is required to raise the temperature of a given amount of substance.

When compared, the low-frequency waves of the alligator are stretched out, while the high-frequency shapes of the frogs are very close together.

The fewer the oscillations, the lower the frequency. Oscillations are more common at higher frequencies. The frequency units are known as hertz (Hz). Humans with typical hearing can detect noises at frequencies ranging from 20 to 20,000 hertz.

A wave's frequency is inversely proportional to its wavelength. That is, high-frequency waves have a short wavelength, whereas low-frequency waves have a greater wavelength. The wavelengths of light waves are quite short.

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A) The body radiates approximately 190 W of thermal power into the room.

B) The net power radiated by the person is approximately 170 W.

C) The net radiated power by the person, when in a room with a temperature of 20 degrees Celsius, is approximately 452 W (rounded to the nearest 10 W).

A) The thermal power radiated by the body (Prb) can be calculated using the Stefan-Boltzmann law:

Prb = e * σ * A * (Tbody⁴ - Troom⁴)

Where:

e is the emissivity (0.6),

σ is the Stefan-Boltzmann constant (5.67 * 10⁻⁸ W/m²/K⁴),

A is the surface area of the body (2πrL, where r is the radius of the body),

Tbody is the temperature of the body (30 degrees C + 273.15 K),

Troom is the temperature of the room (20 degrees C + 273.15 K).

Substituting the given values into the equation, we can calculate Prb.

B) The net power radiated by the person (Pnet) is given by the difference between the power radiated by the body and the power absorbed from the room:

Pnet = Prb - Pabs

Pabs can be calculated using the Stefan-Boltzmann law:

Pabs = e * σ * A * Troom⁴

Substituting the given values into the equation, we can calculate Pabs. Then, we can calculate Pnet by subtracting Pabs from Prb.

C) Using the given dimensions, the radius (r) of the cylinder can be calculated from the circumference (C):

C = 2πr

0.8 = 2πr

r = 0.8 / (2π)

r ≈ 0.127 m

Now we can proceed with the calculation of the net radiated power (Pnet).

Using the Stefan-Boltzmann law, we can find the power absorbed (Pabs) by the person from the room temperature:

Pabs = εσA(Troom⁴)

Where:

ε is the emissivity (0.6)

σ is the Stefan-Boltzmann constant (5.67*10⁻⁸ W/m²/K⁴)

A is the surface area of the body (2πrL, where r is the radius and L is the length)

Troom is the room temperature (20 + 273.15 K)

Substituting the known values:

A = 2πrL

= 2π(0.127)(2.0)

≈ 0.802 m²

Troom = 20 + 273.15

= 293.15 K

Pabs = (0.6)(5.67*10⁻⁸)(0.802)(293.15⁴)

Performing the calculations, we find that Pabs is approximately 228 W.

The net radiated power (Pnet) can be calculated by subtracting Pabs from the total radiated power (Prb) obtained in Part A:

Pnet = Prb - Pabs

Since Prb was calculated to be approximately 680 W (as mentioned in Part A), we can now determine Pnet:

Pnet = 680 - 228 ≈ 452 W

Therefore, the net radiated power by the person, when in a room with a temperature of 20 degrees Celsius, is approximately 452 W (rounded to the nearest 10 W).

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The problem can be solved by applying Newton's laws of motion.

Here are the steps that can be followed;

Step 1: Draw a Free Body Diagram of the given system.

Step 2: Resolve the forces in x and y direction.

Step 3: Find out the acceleration of the system using the equation Fnet = ma.  (Where Fnet is the net force acting on the system).

Step 4: Find the force of friction using the equation of friction f = μN. (Where μ is the coefficient of friction and N is the normal force).

Step 5: Now, using the horizontal force required, calculate the net force acting on the system in the horizontal direction.

Step 6: Compare this with the force of friction. If the net force is greater than the force of friction, the system will move. If it is less than the force of friction, the system will not move.

Step 7: Finally, if the horizontal force required is equal to the force of friction, the system will be in equilibrium.Now, let's apply these steps to solve the given problem. A horizontal force is applied to a 4 kg block placed on a horizontal surface. The coefficient of friction between the block and the surface is 0.4.

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Answer:

the speed of the wave on the string is 43.16 m/s

Explanation:

Given;

first harmonic of the wave formed by the string, f₀ = 26 Hz

length of the string, L = 0.83 m

The wavelength for first harmonic of the wave is calculated as;

L = N ----> N

L = λ₀/2

λ₀ = 2L

The speed of the wave on the string is calculated as follows;

v = f₀λ₀

v = f₀ x 2L

v = 26 x 2 x 0.83

v = 43.16 m/s

Therefore, the speed of the wave on the string is 43.16 m/s

What Newton discovered is that  gravity extends throughout the universe.

The term gravity refers to the force that acts on a body in the universe. It is gravity that makes an object to fall when it is thrown up. The force of gravity acts on every object in the universe and it extends through the universe.

Humans have always known about gravity when they fall from a height and when they threw things up. However, human did not know that gravity extends throughout the universe.

Thus, what Newton discovered is that  gravity extends throughout the universe.

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Answer:

Magnetism

Explanation:

The best way to summarise the key results in a lab guide is by representing them through diagrams.

The important findings in a lab report are those that confirm or refute the working theories. Furthermore, other findings that are crucial to understanding the processes and/or mechanisms explored in the experiment may also be among the significant findings. The best way to summarise these results is by presenting them through diagrams o graphical presentation.

Key outcomes in an experiment can be findings that serve as stepping stones toward the trial's conclusion or findings that may not directly relate to the experiment itself but are nonetheless crucial to its success. A significant finding in an experiment is one that determines whether a hypothesis is accepted or rejected.

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The evidence listed in the table can be used to support these conclusions. Due to a shift in motion, entries 2 and 3's forces are out of equilibrium (option B).

The push or pull on a mass-containing item changes its velocity. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.

In terms of a physical action or movement, force is essentially a push or pull that acts on an item or energy. When two things come into contact, it occurs. Also, a body is in motion when it is moving.

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