Suppose we observe a cepheid variable in a distant galaxy. The cepheid brightens and dims with a regular period of about 10 days. What can we learn from this observation?.

A transformer uses 91 V supply to operate 13 V device, then the current in the primary coil is 0.27A.

A transformer is an electrical device which is involved in transferring electric energy from one AC circuit to another, either stepping up or down.

As, from the ohm's law, voltage is directly proportional to the current flowing through the coil.

I₂ / I₁ = V₂ / V₁

The current from the transformer I₁ is 1.9A, the voltage supply V₁ = 91V and the voltage to operate is 13 V, then the current through the primary coil is

I₂ = (91 / 13 ) x 1.9

I₂ = 0.27A

Thus, the current from the primary coil is 0.27A.

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Answer:

mg i would say an atomic number of 12 the um i would say stands for micrometer

Explanation:

Frequencies would show resonance will be 30 Hz,45 Hz and 60 Hz. Option B and E are correct.

Mechanical systems and charged particles all have a frequency that they vibrate at. this frequency is referred to as the resonance frequency or natural frequency.

When the matching vibrations of another item enhance the amplitude of an object's oscillations, this is known as resonance.

15 Hz is the fundamental frequency of the string.

Higher frequencies, such as the first overtone, second overtone, third overtone, and so on, must be used to cause the string to vibrate in a resonant manner.

F₁ = 2F₀ = 2 x 15 = 30 Hz is the initial overtone.

F₂ = 3F₀ = 3 x 15 = 45 Hz is the second overtone.

F₃ = 4F₀ = 4 × 15 = 60 Hz is the third overtone.

Hence,frequencies would show resonance will be 30 Hz,45 Hz and 60 Hz. Option B and E are correct.

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The force exerted by the output piston will be 20 N. The pressure exerted on the both end is equal.

The force applied perpendicular to the surface of an item per unit area across which that force is spread is known as pressure.

It is denoted by P. The pressure relative to the ambient pressure is known as gauge pressure.

The area of the input cylinder is found as;

A₁=πR₁²

A₁=π(2)²

A₂=4π

The area of the output cylinder is found as;

A₂=πR₂²

A₂=π(4)²

A₁=16π

The pressure exerted on the both end is equal ;]

P₁=P₂

F₁A₁=F₂A₂

80 ×4 π==F₂×16 π

F₂=20 N.

Hence,the force exerted by the output piston will be 20 N.

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Answer:

They need carbon, sunlight and water.

Explanation:

Answer:

The 6 kg cat.

Explanation:

The six killogram cat because accelaratoin due to gravity is more for havy objects then smaller objects. (or lighter I suppose) ;)

Answer:

the cat with a mass of 6 kg

Explanation:

Potential Energy : Weight x Height

PE of cat w/ mass 4 kg :

PE of cat w/ mass 6 kg :

Clearly, the cat with a mass of 6 kg has greater potential energy.

Answer:

False

Explanation:

Solid water (ice) has a lesser density than liquid water. Hence, the statement is false.

Answer:

False

Explanation:

Let's know the relationship

Density is indirectly proportional to volume

If volume is less density is more and if volume is more density is less.

But Density also depends on temperature

Higher the temperature higher the density.

Liquid has higher density than solid .

Sound waves go along a corridor, past an open doorway. All the waves will have the most difficulty diffracting through the doorway. Option D is correct.

Diffraction refers to a variety of events that occur when a wave collides with a barrier or an opening.

Diffraction is described as the bending of waves around the corners of an obstruction or through an aperture into the region of the obstacle's geometrical aperture's shadow.

The one with the longer wavelength will readily diffract. As a result, the one with a wavelength of 100 m can diffract readily.

Sound waves have a wavelength of 16.6 ×10⁻³ to 16.6 m in comparison to other waves. Which are audible to them, allowing them to diffract readily.

Sound waves go along a corridor, past an open doorway. All the waves will have the most difficulty diffracting through the doorway.

Hence,option D is correct.

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Answer:

Mars is an opportunity for humans to carry forward the light of consciousness, plus it is the closest planet like earth, it has land humans can land on and although its small, theres still water

The phenomenon of inducing voltage by changing the magnetic field around a conductor will be Electromagnetic Induction. Option B is correct.

According to Faraday's law of electromagnetic induction, the rate of change of magnetic flux link with the coil is responsible for generating emf in the coil to result in the flow of amount of current .

So in order to increase the current, we need to increase the EMF;

so we can increase it by;

1) Increasing the number of turns

2) Increase the area of the loop

3) By moving the magnet faster

Hence, option B is correct.

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[tex]\text{Given that,}\\\\m_1 = m_2= 15~ kg\\\\r = 35~ m \\\\G = 6.67 \times 10^{-19} Nm^2 kg^{-2}\\\\\text{Gravitational force,}\\\\F_g = \dfrac{Gm_1 m_2} {r^2 }\\\\\\~~~~=\dfrac{6.67 \times 10^{-19} \times 15 \times 15}{35^2}\\\\\\~~~~=1.2252 \times 10^{-19}~N[/tex]

The magnitude of the electric field at the dot is : 10⁴ v/m

Electric field is a region around a charged particle or object within which a force would be exerted on other charged particles or objects.

Given that there are three equipotential lines with equal spacing,we will apply the the relationship between P.D and electric field

Determine the magnitude of the electric field at the dot

change in voltage  = E .d

[tex]100 - 0 = E \times ( 1 \times 10^{-2}\ m ) ----- ( 1 )[/tex]

From equation ( 1 )

The magnitude of electric field will be given as

[tex]E = \dfrac{100 }{ ( 1 \times 10^{-2})\ }[/tex]

[tex]E = 10^4\ \ \frac {v}{ m}[/tex]

Hence we can conclude that The magnitude of the electric field at the dot is :  10⁴ v/m

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Answer:

Sodium ions

Explanation:

Please click crown below my answer.

Answer:

Another way electromagnetic (EM) waves are like ocean waves is that they both move energy from one place to another. The biggest difference between ocean waves and EM waves is that ocean waves move across water. Energy moves through the water. EM waves don't need anything to move through.

Explanation:

Answer:

Newton (N)

Explanation:

Newtons are used to measure force.

As a minimum requirement, a boat that is less than 26 feet in length with an installed fuel tank must have 5-B fire extinguisher.

A fire extinguisher is a fire protection device used to terminate or control small fires, often in emergency situations.

If your boat is less than 26 feet, you need one 5-B fire extinguisher on board.

Thus, as a minimum requirement, a boat that is less than 26 feet in length with an installed fuel tank must have 5-B fire extinguisher.

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Answer:

the fusion of hydrogen nuclei or in other words "nuclear fusion"

Explanation:

The difference between an electrician and an electrical engineer is the way of working towards a common electrical project.

An engineer is a person who performs a function like designing, building, or maintaining engines, machines, or structures.

Electrical engineers and electricians both commonly involved in the process of creating and installing critical electrical systems.

An electrical engineer can design electronics and is familiar with the working of electrical parts.

An electrician is much more like a builder. They take the designs from electrical engineer and follow them to create, repair, or revise actual electrical systems.

Thus,  the difference between an electrician and an electrical engineer is the way of working towards a common electrical project.

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The appropriate explanation for why thermal energy is a combination of the kinetic and potential energies is Thermal Energy is based on how quickly the particles are moving (kinetic energy) and how much energy is stored in their electric fields (potential energy)

Thermal energy refer to the heat energy generated from an object or particle when there is increase on temperature whose internal energy is in equilibrium

Potential energy is the energy stored in a body at rest.

Kinetic energy is the energy at work in a body in motion.

Therefore, The appropriate explanation for why thermal energy is a combination of the kinetic and potential energies is Thermal Energy is based on how quickly the particles are moving (kinetic energy) and how much energy is stored in their electric fields (potential energy)

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Answer:

Explanation:

Remark

Don't read it literally. It does not mean that you are on earth's surface one moment and the next your floating somewhere on the edge of the milky way.

It means that before the remark was made, you were outgoing and friendly. Something happened that caused you to withdraw from society and become somewhat like a hermit.

The most likely mean for aurora. She drinks one or two drinks every night. Option C is correct.

Binge-drinking is explained as having five or more drinks in one sitting for males, and four or more drinks in one sitting for women.

The majority of people who binge-drink do not have a serious alcohol problem. Binge-drinking, on the other hand, is a dangerous risk behavior linked to significant injuries and a variety of disorders.

Hence, option C is correct.

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Answer:

4.2 into the atmosphere

Explanation:

Carbon movement into atmosphere :

Carbon movement in the sinks :

Net Carbon Movement :

Answer:

Explanation:

The distance traveled by the sound wave between the beats of mosquito flapping its wing is its wavelength. Since it is defined as the distance traveled by a periodic disturbance that propagates in a cycle, it is shown as:

λ = v/f

λ=340m/800Hz = 0.425m.

Pretty sure this is the answer, hope this helps!

[tex]\huge{\boxed{\mathcal{♔︎Answer♔︎}}}[/tex]

200Ω

Explanation:

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⠀⠀⠀⠀❖ Note

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What is resistance?

Resistance is the opposition offered by the electric current.

⠀

What is electric current?

An electric current is the stream of flowing charge moving around a circuit.

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⠀⠀⠀⠀■ Solution

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[tex] \textsf{ As here, we can see in the above diagram} \\ \\ \sf R_1 \: and \: R_2 \: both \: are \: in \: series. \\ \\ \textsf{ So their total resistance will be} \: R_s[/tex]

So for formula for series will be

[tex] \sf R_s = R_1 + R_2 \\ \\ \sf R_s = 100 + 200 \\ \\ \boxed {R_s = 300Ω}[/tex]

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[tex] \sf As \: you \: can \: also \: see \: here , \\ \\ \sf R_s \: is parallel \: with \: R_3 \\ \\ \sf So \: their \: total \: resistance \: R \: will \: be[/tex]

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[tex] \sf \frac{1}{R } = \frac{1}{R_3} + \frac{1}{R_s } \\ \\ \sf \frac{1}{R} = \frac{1}{600} + \frac{1}{300} \\ \\ \sf \frac{1}{R} = \frac{1 + 2}{600} \\ \\ \sf \frac{1}{R} = \frac{ \cancel3}{ \cancel{600} \: \: \small{200}} \\ \\ \sf \frac{1}{R} = \frac{1}{200} \\ \\ \boxed{ \tt{R = 200Ω}} [/tex]

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So the total resistance will be 200Ω.

Answer:

One gram atom of any substance contains one Avogadro number of atoms. Therefore, the number of atoms of U-235 present in 235 g of the substance = Avogadro Number = 6.02×10^23 atoms

The number of U-235 atoms present in 1 g of the substance = (6.02×10^23/235) atoms=2.56×10^21 atoms

Energy released in one atom fissioning = 200 MeV= 200 MeV × 1.6 × 10^-6 erg/MeV= 3.2 ×10^-4 erg/atom.

Energy released in the fission of all the atoms contained in 1g of Uranium-235 fissioning = (2.56×10^21 atom)×(3.2×10^-4 erg/atom)=8.19 ×10^17 erg

Now

1 kWh = 1000 Watt hour = 1000×( 10^7 erg/s)×3600s = 3.6 ×10^13 erg/kWh

So energy in kWh released in fission of 1 g of U-235 = (8.19× 10^17 erg)÷(3.6×10^13 erg/kWh) = 2.55 ×10⁴ kWh.

Added on 19th February, 2019.

The energy consumption of an average home in India in a month is between 300–500 kWh in the metropolitan cities. Let us take it at 400 kWh. So one gram of nuclear fuel (uranium) would be able to meet the energy requirements of a town of about 6000 for a month.

The energy in a fissile material is highly concentrated, compared to other types of fuels like wood, coal, diesel etc. So nuclear powered submarines can remain below water for very long periods of time, as they do not need to surface for getting fuel.

Explanation:

Energy in kWh released in fission of 1 g of U-235 is 2.55 ×10⁴ kWh.

One gram atom of any substance contains one Avogadro number of atoms. Therefore, the number of atoms of U-235 present in 235 g of the substance = Avogadro Number = 6.02×10^23 atoms

The number of U-235 atoms present in 1 g of the substance = (6.02×10^23/235) atoms=2.56×10^21 atoms

Energy released in one atom fissioning = 200 MeV= 200 MeV × 1.6 × [tex]10^{-6}[/tex] erg/MeV= 3.2 ×[tex]10^{-4}[/tex] erg/atom.

The energy released in the fission of all the atoms contained in 1g of Uranium-235 fissioning = (2.56×[tex]10^{21}[/tex] atom)×(3.2×[tex]10^{-4}[/tex] erg/atom) = 8.19 ×[tex]10^{17}[/tex] erg

1000 Watt hour = 1000×( [tex]10^{7}[/tex] erg/s)×3600s = 3.6 ×10^13 erg/kWh

So the energy in kWh released in fission of 1 g of U-235 = 2.55 ×10⁴ kWh.

Fission takes place when a neutron slams into a bigger atom, forcing it to excite and break up into smaller atoms—additionally referred to as fission products. Extra neutrons are also launched that may initiate a sequence reaction. whilst each atom splits, a high-quality amount of electricity is released.

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Hubble classification for a spiral galaxy with a small nuclear bulge and wide loosely wound spiral arms is a, b and c.

Galaxy is the collection of stars, interstellar gases, dust and stone in the large space of universe.

Hubble classified these galaxies by referring them as SB galaxies with subclasses a, b, and c. They are just like the normal spirals. The spiral arms in barred spirals don't actually but appear to originate at the ends of the bar.

Hence, Hubble classification for a spiral galaxy with a small nuclear bulge and wide loosely wound spiral arms is a, b and c.

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Hi there!

We can use Faraday's Law to solve:

[tex]\epsilon = N\frac{d\Phi _B}{dt}[/tex]

ε = Induced emf (? V)

N = Number of loops (1 loop)

ΦB = Magnetic flux (Wb)

We know that:

[tex]\Phi_B = \oint B \cdot dA = B\cdot A[/tex]

Since the area of the loop remains the same, we can take this out of the time derivative.

We get:
[tex]\frac{d\Phi_B}{dt} = A * \frac{dB}{dt}[/tex]

Also, since N = 1, we can now rewrite the equation for the induced emf as:
[tex]\epsilon = A * \frac{dB}{dt}[/tex]

dB/dt is equivalent to the change in the magnetic field with respect to time:
[tex]\Delta B = \frac{B_f - B_i}{\Delta t}\\\\\Delta B = \frac{3 - 2}{5} = 0.2 \frac{T}{s}[/tex]

Now, substitute this value into the equation for induced emf:
[tex]\epsilon = \pi (0.3^2) * (0.2) = \boxed{0.0565 V}[/tex]

**Also, since the magnetic field INCREASED out of the page, this change in magnetic flux will create an induced CLOCKWISE current that produces a magnetic field into the page in order to oppose the increase in magnetic flux OUT of the page.

Sorry but I can't help you cuz the words you use makes no sens if you are going to ask a question pls do and dont joke around about it thank you very much and have a great day! ^^

Answer:

Option c: wind and clouds