In which direction does the sun appear to move across the sky

Answer:

[tex]\mathbf{\dfrac{F}{A}= -\dfrac{( \alpha_A + \alpha _B)\Delta T}{\bigg ( \dfrac{1}{Y_A}+ \dfrac{1}{Y_B}\bigg )} }[/tex]

Explanation:

From the information given.

The formula for Youngs modulus(Y) can be illustrated as follows:

[tex]Y = \dfrac{F/A}{\Delta L /L}[/tex]

where;

F = force

A = area

ΔL / L = the fraction of the change that occurred in the length.

If we make ΔL / L the subject of the formula, the above expression can be re-written as:

[tex]\dfrac{\Delta L}{L } = \dfrac{1}{Y}\dfrac{F}{A}[/tex]

However, the total fractional change that occurred in the length can be computed as:

[tex]\dfrac{\Delta L_{compressive \ stress}}{L} = \dfrac{\Delta L_A}{L_A} + \dfrac{\Delta {L_B}}{L_B}[/tex]

where;

[tex]L = L_A = L_B[/tex]

The area of both rods is said to be equal as well.

Thus;

[tex]\dfrac{\Delta L_{compressive \ stress}}{L} = \dfrac{1}{Y_1} \dfrac{F}{A}+ \dfrac{1}{Y_2}\dfrac{F}{A}[/tex]

[tex]\dfrac{\Delta L_{compressive \ stress}}{L} =\bigg( \dfrac{1}{Y_1} + \dfrac{1}{Y_2} \bigg ) \dfrac{F}{A}[/tex] ----- Let this be equation (1)

Recall that:

[tex]\dfrac{\Delta L }{L }= \alpha \Delta T[/tex]

in which

ΔL = change in length

L = the original length of rod before extension

∝ = coefficient of linear expansion

ΔT = temperature change

Similarly:

The total fractional change in the length is:

[tex]\Delta L _{thermal} = \Delta L_A +\Delta L_B[/tex]

[tex]\Delta L _{thermal} = \alpha_AL \Delta T+\alpha_BL \Delta T[/tex]

[tex]\dfrac{\Delta L _{thermal}}{L} =( \alpha_A+ \alpha _B) \Delta T \ \ \ ---(2)[/tex]

The sum of both the thermal and compressive stress of the combined rod is equal to the fractional change.

Mathematically:

[tex]\Delta L_{net} = \Delta L_{thermal} + \Delta L_{compressive \ stress}[/tex]

where;

[tex]\Delta L_{net} =0[/tex]

∴

[tex]0 = \Delta L_{thermal} + \Delta L_{compressive \ stress}[/tex]

[tex]\Delta L_{compressive \ stress} =- \Delta L_{thermal}[/tex]

From equation (1) & (2)

[tex]\bigg( \dfrac{1}{Y_1} + \dfrac{1}{Y_2} \bigg ) \dfrac{F}{A}= - (\alpha_A + \alpha_B) \Delta T[/tex]

Making the stress [tex]\dfrac{F}{A}[/tex] the subject, we get;

[tex]\mathbf{\dfrac{F}{A}= -\dfrac{( \alpha_A + \alpha _B)\Delta T}{\bigg ( \dfrac{1}{Y_A}+ \dfrac{1}{Y_B}\bigg )} }[/tex]

Answer:

i dont know the actual answer but i can tell you that it takes 4 seconds for a ball to hit the ground .

Explanation:

Answer:

Explanation:

i wanna say its A

Answer:

Lessens

Explanation:

The performance of an engine at high altitudes is lower due to the decreasing density of air with elevation, such that at high altitude, the density is much less and a given quantity of oxygen occupies much more space at high altitudes, and the oxygen content in the air drawn in is lesser at high altitude, and the combustion power is much lesser at high altitudes when the engine speed is high up to about 4000 rpm.

Answer:

44.492 kg

Explanation:

Convert pounds to kilograms.

1 lb = 0.454 kg

98 lb * 0.454 kg =44.492 kg

Answer:

what he said above is correct yes

Explanation:

Answer:

C

Explanation:

I took the asssinghment and got an 100

Your answer is: earthquakes.

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Have a good day and God bless! :D

Answer:

B

Explanation:

direction is literally the only difference between speed and velocity

Taking into account the definition of speed and velocity, the correct answer is option b. Unlike acceleration and velocity, speed is NOT a quantity that accounts for direction.

Speed ​​refers to the distance an object travels in a given time and is a scalar quantity.

On the other hand, velocity is a magnitude that expresses the relationship between the space traveled by an object, the time used for it and its direction. In other words, velocity refers to the interval of time it takes for an object to move towards a certain direction. Since velocity considers the direction in which an object moves, it is considered a vector character magnitude.

In summary, speed does not take into account the direction of movement, while speed implies the change of position of an object in space within a certain amount of time, that is, speed plus the direction in which said movement is produced.

Finally, the correct answer is option b. Unlike acceleration and velocity, speed is NOT a quantity that accounts for direction.

Learn more:

Electric field and magnetic field has both the attractive and repulsive character.

Electric field is defined as the region surrounding a charged particle, in which it experiences an electric force.

Here,

Electric field and magnetic field has both the attractive and repulsive character.

Both electric and magnetic fields obey the inverse square law.

Stationary charges produce electric field, whereas moving charges produce magnetic field.

Electric field is associated with two kind of charges, positive and negative, whereas magnetic field is associated with two magnetic poles, north and south.

Both electric field and magnetic field are associated with principle of superposition.

Hence,

Electric field and magnetic field has both the attractive and repulsive character.

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Answer:

it would dry your hair lol

Answer:kinetic energy

Explanation:

Answer:

The new position of the sailboat is 108.2 m, at N 53.3° E

Explanation:

From the image uploaded, R is the resultant displacement and it is calculated as;

R² = 90² + 60² (Pythagoras theorem)

R² = 11700

R = √11700

R = 108.2 m

The direction of the boat is given by θ in the image uploaded;

tanθ = opp/adj

tanθ = 90 / 60

tanθ = 1.5

θ = tan⁻¹(1.5)

θ = 53.3°

θ = N 53.3° E

Therefore, the new position of the sailboat is 108.2 m, at N 53.3° E

Answer:

Mg + 2Cl ----> MgCl2

Explanation:

In writing a chemical reaction equation, it is a rule that the number of atoms of each element on the right hand side must be equal to the number of atoms of each element on the left hand side.

If this condition is fulfilled, the reaction equation is said to be balanced.

In this case, there are two chlorine atoms and one magnesium atom on both sides of the reaction equation hence the equation is balanced.

25.006m

Hope it helps! :3

Answer: b. 420 m/s

Explanation: ap3x

The frequency of the wave with the speed of 345 m/s and wavelength of 23 m is 15 Hz. With the same frequency the speed of wave t 28 m wavelength will be 420 m/s.

Frequency of a wave is the number of wave cycles per unit volume. It is the inverse of time period thus have the unit of s⁻¹ which is equivalent to one Hz. Frequency is inversely proportional to the wavelength.

The relation between frequency, wavelength and speed of a wave is written as follows:

c = νλ

Given that, speed of the wave = 345 m/s

wavelength =23 m

frequency = speed/wavelength

v = 345 m/s /23 m = 15 Hz.

New wavelength = 28 m

frequency = 15 Hz

then speed = 15 Hz × 28 m = 420 m/s.

Hence, the speed of the wave become 420 m/s. Option B is correct.

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Answer:

D

Explanation:

Answer:

See the answer below.

Explanation:

The weight of the table should be equal to the weight of the table plus the weight of the book.

[tex]w_{table}=m_{table}*g\\w_{table}=200*9.81\\w_{table}=1962[N][/tex]

And for the book

[tex]w_{book}=m_{book}*g\\w_{book}=50*9.81\\w_{book}=490.5[N][/tex]

And the total weight

[tex]w = w_{table}+w_{book}\\w=1962+490.5\\w = 2452.5 [N][/tex]

For the system to be in balance, the reaction force exerted by the table on the book must be equal to the weight of the book. This force in physics is known as the normal force.

[tex]N_{force} = w_{book}\\N_{force}=490.5[N][/tex]

Answer:

Face - off

Explanation:

Face - off is a term used in ice hockey to start periods of play and also to restart the play/action after a previous stoppage.

This face - off involves two opposing players from the 2 opposing teams standing opposite each other at an approximate distance of one sticks blade with the game official dropping the puck between them. Thereafter, two players will then to try to gain possession of the puck.

Answer:

Hydrothermal vents

Explanation:

A hydrothermal vent is found along with areas of volcanic activity in the ocean floor which discharges geothermally heated water. Tectonic plates in such areas move apart at spreading centers and hotspots to form hydrothermal vent.

A hydrothermal vent ejects hot and often toxic, fluids and gases into the surrounding seawater when seawater meets magma.

Hence, the correct answer is "Hydrothermal vents".

Answer:

a, b, a, c, that should be the order from top to bottom

Answer:

Carbon Dioxide

Explanation:

Isotopes can be found in Carbon 12

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]

m is the mass

v is the velocity

From the question we have

[tex]k = \frac{1}{2} \times 30 \times {15}^{2} \\ = 15 \times {15}^{2} \\ = {15}^{3} \: \: \: \: \: \: \: \: \: \: [/tex]

We have the final answer as

Hope this helps you

Answer:

Option C

Explanation:

Centripetal acceleration formula regarding velocity and radius is,

[tex]a_c=\frac{v^2}{r}[/tex]

now we know the centripetal acceleration is 9 and the radius is 16 so we plug these values into our formula,

[tex]a_c=\frac{v^2}{r}\\\\9=\frac{v^2}{16} \\\\144=v^2\\\\\sqrt{144}=v \\\\v=12\ m/s[/tex]

so velocity is 12 m/s

Now for the angular velocity, the formula of centripetal acceleration regarding angular velocity and radius is,

[tex]a_c=rw^2[/tex]

we know the centripetal acceleration is 9 and the radius is 16 so plug these values into the formula,

[tex]a_c=rw^2\\\\9=16w^2\\\\0.5625=w^2\\\\\sqrt{0.5625}=w \\\\0.75\ rad/s=w\\[/tex]

so angular velocity is 0.75 rad/s

Answer:

speed is equal to distance/time

so 2m/40s

=0.05

Answer:

SeC14

Explanation:

sec14>C12-O

but since you can't subtract o from c , you get this