Which of the following is an example of a pure tangible good?
A) massage B) shampoo C) e-mail D) restaurant mealE) air travel

Answer:

earth

Explanation:

its the only planet.

Acceleration of the car is 6 m / s ².

a =  ( v - u ) / t

a stands for acceleration

u stands for initial velocity

v stands for final velocity

Given ,

u = 5 m / s

v = 20 m / s

t = 2.5 s

a =  ( v - u ) / t

a = ( 20 - 5 ) / 2.5

  =  15 / 2.5

 a  = 6 m / s ²

Hence , Acceleration of car is 6 m / s ² .

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The given question is incomplete kindly refer below for complete question :

A car accelerates from 5m/s to 20m/s in 2.5 seconds . Find the acceleration of the car .

Answer:

125 / 500 = 1/4    of the sample left after 3.0 yrs

1/2 * 1/2 = 1/4        sample has decayed thru 2 half-lives

2 * HL = 3

1 Half-Life = 1.5 yrs

Scientific sociology is one of the three methods of sociological investigation that fits the topic the best.

It is possible to define sociology as the scientific study of society, which includes a complete analysis of both internal and external elements that can have an impact on social structures and interaction patterns.

It should be noted that while the sociology field is very broad and full of opportunities that are required to complete the study that is being discussed in the work, this study focuses on social interaction and culture, which help to determine the things that can be used to learn more about the society.

In conclusion, of the three methods of sociological inquiry, scientific sociology is the most effective for the study of society.

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Answer: about half of the sea ice area in the Arctic has been lost.

Explanation: The shrinking summer sea ice cover is a visible manifestation of global warming, and affects marine ecosystems, ocean circulation, and potentially weather events further south of the Arctic.

The distance which a force of 3N will pull a wooden block before transferring 12J of energy is 4m.

This is referred to as an influence that can change the motion of an object and the unit is Newton.

It has a relationship with distance and work which can be seen below:

Work = Force × distance

12J = 3N × d

d = 12/3 = 4m.

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Answer:

\(m_B > m_A\)

the mass of body B must be greater than the mass of body A

Explanation:

Newton's second law establishes a linear relationship between the force, the mass of the body and its acceleration

        F = m a

        a = F / m

Let's analyze this expression tells us that the force is of equal magnitude for the two bodies, but body A goes faster than body B, this implies that it has more relationships

         a_A > a_B

         \(\frac{F}{m_A} > \frac{F}{m_B}\)

         \(m_B > m_A\)

Therefore, for this to happen, the mass of body B must be greater than the mass of body A

26.676 × 10³ kg is the weight of the aluminum rod.

Given:

Length of cylindrical rod (h) = 45 cm

Diameter of a cylindrical rod = 4.53 cm

Radius of a cylindrical rod (r) = 2.3 cm

The density = 3.7*10^3kg/m^3

Volume of a cylindrical rod = πr²h

                                             = 3.14× (2.3)² × 45

                                             = 747.89 cm

                                             = 7.4789 m

To find weight ;

                         ρ = \(\frac{Mass}{Volume}\)                  ; ρ = Density

                        Mass = ρ × Volume

                                  = 3.7 × 7.48 × 10³

                                  =27.676 × 10³ kg

Therefore, the weight of the aluminum rod is 27.676 × 10³ kg.

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The figure in the picture represents the rotatory motion and hence, option B is correct.

When an object its position with respect to time is defined as the object is in motion. The motion of objects is of several types and they are linear or rectilinear motion, rotatory motion, circular motion, and harmonic motion. When an object travels in a straight line, then the object is in rectilinear motion. If the object moves in a circular path, then it is called circular motion.

If an object rotates in a fixed axis and moves in a circular path, then it is called rotational motion. The given picture shows the wheel moving in a circular motion but rotating on a fixed axis. Hence, the giant wheel is an example of rotational motion.

Thus, the ideal solution is option B.

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The true azimuth of the AB alignment is 91º 52' (east of north), the magnetic azimuth is 100º 22' (east of north), and the grid azimuth is 108º 52' (east of north).

To find the true azimuth, magnetic azimuth, and grid azimuth of the AB alignment, we need to consider the magnetic declination. The magnetic declination indicates the angle between true north and magnetic north at a specific location. In this case, the magnetic declination is 8º 30' E, which means that the magnetic north is 8º 30' east of the true north.

To calculate the true azimuth, we subtract the magnetic declination from the grid azimuth. The grid azimuth is given as 100º 22', so subtracting the magnetic declination of 8º 30' E gives us a true azimuth of 91º 52' (east of north).

The magnetic azimuth remains the same as the grid azimuth, which is 100º 22' (east of north).

The grid azimuth is calculated by adding the magnetic declination to the true azimuth. Since the magnetic declination is east, we add it to the true azimuth. Adding 8º 30' E to the true azimuth of 91º 52' gives us a grid azimuth of 108º 52' (east of north).

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Answer:

B

Explanation:

Hii :) Im not sure but I think the answer is E. DC power source.

The symbol represents the DC power source component in the electrical circuit. So, the correct option is E.

Direct current or dc can be defined as the flow of electrons, which is in a unidirectional way.

Here,

The given symbol represents the DC power source component in the electrical circuit.

The direct current is the form of power, that has been most commonly produced by the power sources such as batteries, solar cells, etc.

The dc power is mainly used in the devices with low voltage applications such as automotive devices, charging batteries, aircraft applications and also in the low current application devices.

Hence,

The symbol represents the DC power source component in the electrical circuit.

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Few meteors make it through the thick air of this planet without disintegrating. This statement is false.

Meteors refer to heavily sized metallic objects or rock fragments that are formed as a result of a collision between asteroids.

These rock lumps revolve around the sun and are smaller in size than asteroids.

Their size ranges from grain-sized particles to about 1 meter wide objects

As they enter the atmosphere of earth they crash forming streaks of light and disintegrate into small-sized dust particles and never get through the thick air of the earth.

However, they impact the earth in several ways such as heating the earth's surface.

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Some people object to the inverted pyramid style, saying it has lost its usefulness for a variety of reasons, including- Increased reader sophistication, Lack of drama and Digital media.

The inverted pyramid style, which features the most significant information at the top and the least important at the bottom, is widely used in journalism. However, some individuals object to this style, claiming that it has lost its usefulness for various reasons, including:

Increased reader sophistication: According to some, the pyramid style is unsuitable for a more educated readership. They argue that the inverted pyramid's oversimplification of facts does not meet modern reader expectations.

Lack of drama: Because the inverted pyramid's central event is displayed at the beginning, the story can lose its drama as it unfolds. They also argue that a traditional storytelling approach is better suited for dramatic stories.

Digital media: In recent years, digital media has altered the way news is delivered and consumed. With the advent of click-bait articles and scrollable pages, the inverted pyramid is deemed less effective for digital media platforms. Instead, writers must adapt to the requirements of online audiences and deliver compelling and concise material to grab their attention. Overall, the pyramid-style may still be appropriate for certain articles. However, due to an increasing readership, a focus on storytelling, and changes in digital media, the traditional approach is losing its effectiveness.

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When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object has a positive acceleration. In Example B, the object is moving in the negative direction (i.e., has a negative velocity) and is slowing down.

Answer:

B) Caused by the Sun

Explanation:

If you look at a picture of a solar system, you will see the sun in the middle. The sun is the powerhouse of the solar system. So that means that the sun is the biggest star and can provide enough light to reach earth and keep it lit.

The meaning of the word solar in the article "Fire Up the Sun" is caused by the sun so, option B is correct.

The sun is the star that the earth and the other planets in the solar system orbit. With more than 99 percent of the system's total mass, it is the dominant body. A portion of the tremendous quantity of energy coming from the Sun powers the light and heat that keep Earth habitable for life.

The sun is in the center of a solar system if you look at a picture of one. The solar system's center of gravity is the sun. This indicates that the sun is the largest star and that it can illuminate the earth and keep it bright.

The Sun is a G2 V star, which means that it has a surface temperature of roughly 5,800 kelvins (K), making it the second-hottest star in the yellow G class.

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From angular speed perspective;

a. the scientific notation are:   9400 × 10³ m and 27.6 × 10³ s

b.) the mass of mars is 6.39 × 10^23 kg

c.) the centripetal acceleration is 0.49 m/s²

A satellite orbiting the earth is one of the example of a circular motion. The satellite will experience gravitational attraction towards the center of the earth. This attraction force provides the centripetal force

Given that the martian moon Phobos has a period of 460 min and an orbital radius of 9400 km.

a. convert the distance and orbital period into scientific notation with s.I units.

Distance r = 9400 km = 9400 × 10³ m

Period T = 460 min = 460 × 60 = 27.6 × 10³ s

b. The mass of mars is 6.39 × 10^23 kg

c. The centripetal acceleration of Phobos as it spins around mars can be calculated by using the formula

a = w²r

Where

w =  2π/T

w =  2π/27.6 × 10³

w = 0.0002276 rad/s

Substitute w in the centripetal acceleration formula above.

a = 0.0002276² × 9400 × 10³

a = 0.487 m/s²

Therefore, the centripetal acceleration of Phobos as it spins around mars is 0.49 m/s² approximately

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Answer:

A. Laser 1 has its first maximum closer to the central maximum.

B. 0.077 mm

Explanation:

A) Which laser has its first maximum closer to the central maximum?

Since for a double slit interference, sinθ = mλ/d where θ is the angle between the central axis and the maximum point, m = order of fringe, λ = wavelength of light and d = width of slit.

Also tanθ = y/D where θ is the angle between the central axis and the maximum point, y = distance between maximum point and central axis and D = distance between slit and screen = 4.60 mm.

Since θ is small,  sinθ ≅  θ and  tanθ ≅ θ

So, sinθ ≅ tanθ  

mλ/d = y/D

So, y = mλD/d for the first maximum, m = 1.

So,  y = (1)λD/d

y = λD/d

For the Laser 1, λ = d/20

So, y = λD/d

y = (d/20)D/d  

y = D/20

y = 4.60 mm/20

y = 0.23 mm

For the Laser 2, λ' = d/15

So, y' = λ'D/d

y' = (d/15)D/d  

y' = D/15

y' = 4.60 mm/15

y' = 0.307 mm

Since y = 0.23 mm < y' = 0.307 mm, Laser 1 has its first maximum closer to the central maximum.

B) What is the distance between the first maxima (on the same side of the central maximum) of the two patterns?

The distance between the first maxima (on the same side of the central maximum) of the two patterns is Δy = y' - y = 0.307 mm - 0.23 mm = 0.077 mm

The velocity of the object is 7.74m/s

Though it may sound sophisticated, velocity is simply the rate at which an object's location changes with regard to a frame of reference and time. Since it is a vector quantity, the definition of velocity requires both magnitude (speed) and direction.

We are given that,

Acceleration = 12m/s²

Radius = r = 5.0m

Velocity = v = ?

The velocity of the object can be calculated by the formula ,

a = v²/r

v = √ar

v = √12m/s²× 5m

v = √60m²/s²

v= 7.74m/s

Thus , the velocity of the object would be 7.74m/s.

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the wheel rotates by approximately 4.79 revolutions before coming to a complete stop.

When the electric motor is switched off, the workshop grinding wheel continues to rotate due to its inertia. However, the wheel experiences a constant negative angular acceleration of magnitude 1.94 rad/s^2, which means that its angular velocity decreases over time. The initial angular velocity of the wheel is 1.04 x 10^2 rev/min, which is equivalent to 10.89 rad/s. To find out how long it takes for the wheel to come to a complete stop, we can use the following kinematic equation:

ωf^2 = ωi^2 + 2αΔθ

where ωf is the final angular velocity, ωi is the initial angular velocity, α is the angular acceleration, and Δθ is the angular displacement.

Since the wheel is coming to a complete stop, its final angular velocity is zero. Thus, we can rearrange the equation to solve for Δθ:

Δθ = (ωf^2 - ωi^2) / 2α

Plugging in the values, we get:

Δθ = (0 - 10.89^2) / (2 x -1.94) = 30.10 rad

Therefore, the wheel rotates by 30.10 radians before coming to a complete stop. To convert this to revolutions, we can use the formula:

1 revolution = 2π radians

So the wheel rotates by:

30.10 / (2π) = 4.79 rev

Thus, the wheel rotates by approximately 4.79 revolutions before coming to a complete stop.

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Explanation:

air resistance (f) =mg

200=100g

g=200/100

g=2m/s^2

An appropriate speed for glacial movement generally is six centimeters a year.

A glacier is a vast, slow-moving mass of snow and ice that collects in mountain valleys and spreads outwards, frequently flowing like a very slow river. It forms when snow accumulation exceeds snowmelt, and the compacted snow transforms into ice, a process known as "firnification." This ice subsequently flows downhill under the weight of additional snow accumulation, occasionally for hundreds of miles.

Glaciers can move up to several meters per day, but they typically move at a much slower pace. Even though the speed of a glacier might vary widely based on factors like slope, basal conditions, temperature, and ice thickness, a reasonable speed for glacial movement is six centimeters a year. Furthermore, the rate of movement can vary depending on the time of year and the time of day.

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Answer:

1.78m/s

Explanation:

Given parameters:

Velocity of the arrow = 22.8m/s

Height of the wall  = 15.5m

Unknown:

Time taken for the arrow to reach the ground  = ?

Solution:

To solve this problem we employ the appropriate motion equation:

     H  = ut + \(\frac{1}{2}\) g t²

 H  is the height

  u is the initial velocity = 0

   g is the acceleration due to gravity  = 9.8m/s²

  t is the unknown time

  15.5 = \(\frac{1}{2}\) x 9.8 x t²

  15.5 = 4.9t²

     t² = 3.16

      t = 1.78m/s

Answer:

1351.62 Watts.

Explanation:

The following data were obtained from the question:

Mass (m) = 79.5 kg

Height (h) = 2.29 m

Time (t) = 1.32 s

Acceleration due to gravity (g) = 9.8 m/s²

Power =?

Next, we shall determine the potential energy of the boy. This can be obtained as follow:

Potential energy (PE) = mass × acceleration × height

PE = m × g × h

Mass (m) = 79.5 kg

Height (h) = 2.29 m

Acceleration due to gravity (g) = 9.8 m/s²

Potential energy (PE) =?

PE = m × g × h

PE = 79.5 × 9.8 × 2.29

PE = 1784.139 J

Finally, we shall determine the power generated by Andrew as illustrated below:

Energy (E) = 1784.139 J

Time (t) = 1.32 s

Power (P) =?

P = E/t

P = 1784.139 /1.32

P = 1351.62 watts

Therefore, the power generated by Andrew was 1351.62 watts

The slope of the line ploted, passing through points (0.3) and (3,-3) is -2.

Slope is simply expressed as change in y over the change in x.

Slope m = ( y₂ - y₁ )/( x₂ - x₁ )

Given the coordinates of the points in the graph.

Point 1 (0,3)

Point 2 (3,-3)

Plug the given x and y values into the slope formula and simplify.

Slope m = ( y₂ - y₁ )/( x₂ - x₁ )

Slope m = ( -3 - 3 )/( 3 - 0 )

Slope m = ( -6 )/( 3 )

Slope m = -6 / 3

Slope m = -2

Therefore, the slope of the line is -2.

Option C) -2 is the correct answer.

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Answer: \(0.708\ mA\)

Explanation:

Given

\(E_o=20\ V/m\)

\(\omega =10^7\ s^{-1}\)

Cross-sectional area \(A=0.40\ m^2\)

Current density is given by

\(J=\epsilon_o \dfrac{dE}{dt}\)

Displacement current

\(\Rightarrow I=JA\\\Rightarrow I=8.854\times 10^{-12}\times 20\times 10^7\times 0.4\\\Rightarrow I=0.708\times 10^{-3}\ A\)

The required value of the maximum displacement current of the given space is  \(7.08 \times 10^{-4} \;\rm A\).

Given data:

The intensity of electric field is, \(E_{0}=20 \;\rm V/m\).

The angular frequency of electric field is, \(\omega=1.0 \times 10^{7} \;\rm s^{-1}\).

The cross-sectional area of space is, \(A =0.40 \;\rm m^{2}\).

In the given problem, the instantaneous electric field is given by \(E = E_{0} \times cos(\omega t)\)

So, the expression for the current density is,

\(J= \epsilon_{0} \times \dfrac{dE}{dt}\)

Here, \(\epsilon_{0}\)  is the permittivity of free space. Solving as,

\(J= \epsilon_{0} \times \dfrac{d(E_{0} \times cos(\omega t))}{dt}\\\\J= -\epsilon_{0} \times E_{0} \times \omega \times sin(\omega t)\)

And the expression for the maximum displacement current is,

\(I = J \times A\)

And the maximum displacement current is possible only when, J is positive and J will be positive for  \(sin(\omega t)=-1\).

Then solving as,

\(I = (-\epsilon_{0} \times E_{0} \times \omega \times sin(\omega t)) \times A\\\\I = (-8.85 \times 10^{-12} \times 20 \times (1.0 \times 10^{7}) \times (-1)) \times 0.40\\\\I = 7.08 \times 10^{-4} \;\rm A\)

Thus, we can conclude that the required value of the maximum displacement current of the given space is  \(7.08 \times 10^{-4} \;\rm A\).

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The ratio of the peak wavelength of the sunspot to the peak wavelength of the photosphere can be determined using Wien's displacement law. According to Wien's displacement law, the peak wavelength is inversely proportional to the temperature of the object.

To find the ratio, we need to divide the temperature of the photosphere (9800 K) by the temperature of the sunspot (7350 K). Let's calculate the ratio:

Ratio = Temperature of the photosphere / Temperature of the sunspot
Ratio = 9800 K / 7350 K

The ratio of the peak wavelength of the sunspot to the peak wavelength of the photosphere is main answer: 1.33.

According to Wien's displacement law, the peak wavelength of an object is inversely proportional to its temperature. So, when we have a cooler object (sunspot) compared to a hotter object (photosphere), the peak wavelength of the cooler object will be longer. The ratio of the peak wavelengths is determined by the ratio of the temperatures, which is 7350 K / 9800 K = 0.75. This means that the peak wavelength of the sunspot is 0.75 times longer than the peak wavelength of the photosphere.

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The stopping distance of d2 expressed in terms of d1 d2= 18d1.

According to newton's second law of motion, F= ma.

By using the kinematic equation, v²= u² + 2as

0= 2ad + 2Fd/m

d = v² m/ 2F

Similarly, we can write,

v²₂= u² ₂+ 2as

d2=(3v)² m  /F

d2/d1 = (3v)² m /F/ 2f/ v² m

d2/d1= 9v² m/ v²

d2= 18d1

Therefore, The stopping distance of d2 expressed in terms of d1 d2= 18d1.

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