Write any three advantages of classification of living beings ?

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 convex spherical mirror is the diverging mirror. The image distance is 20.4 cm. The magnification is 0.417. The image is virtual and upright.

Magnification is the ratio of image distance to the object distance.

Object distance is 49 cm and the focal length of convex mirror is 35 cm, then image distance is calculated by the lens maker formula.

1/f = 1/v +1/u

1/-35 = 1`/v +1/49

v= -20.4 cm

Thus, the image distance is 20.4 cm.

The magnification is given by

m = v/u

m = -20.4 / 49

m = 0.417

Thus, the magnification is 0.417.

The image formed is by virtual meeting of light rays and above the principle axis. Thus the image is virtual and upright.

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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!

Answer:

1. False

some metals are ferromagnetic

2.True

3. True

4. True

5. False

The strength of electromagnetic can be increased by increasing the number of wire around it

#1

Very few like Fe,Ni ,Co are ferromagnetic.

#2

True

#3

True

#4

It's Orsterd experiment conclusion

#5

Because

[tex]\sf B=\mu_o nI[/tex]

If you decrease no of turns magnetic force decreases

Answer:

d

Explanation:

Heredity has an impact on personal health, but environmental factors are important as well, the given statement is True.

Heredity represents the transfer of traits from one generation to the next generation. It has an impact on personal heath as the health condition of an individual is goverend by the protein products that control the growth and development of the organism.

For instance, the presence of hazardous substances in air, water, and soil that cause pollution directly have harmful impact on the health of individuals.

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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:

gauge pressure loses what ever pressure is in the local environment around the pressure vessel.  so it's always lower than absolute pressure , except in outter space  :P   then they are the same.  But do you really want to measure your cars tire pressue out in space??  :P

Explanation:

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 .

Answer:

Light from Jupiter should take about 35 - 52 minutes to reach Earth.

Explanation:

Average time is about 44 minutes but the realistic time varies 5 or 6 minutes depending on the orbital location of both earth and jupiter.

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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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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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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The power developed by the student is 756.9 J/s and remains the same if the student takes the same time to climb the stairs when climbing it in two's and three's.

Power is the rate at work is done.

Work done = 65.5 × 10 × (18 × 0.165) = 1945.35 J

Power = 1945.35/2.57 = 756.9 J/s

If the student climbed the steps in two or three at a time, the power does not change if the time remains the same.

The time required to convert the Big Mac meal from McDonalds = 4 853 440/756.9

Time required = 6412.26 seconds

Therefore, from the power developed by the student, it will take him 6412.26 seconds to convert all the energy in a Big Mac meal.

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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.

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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Answer:

time taken.

Explanation:

F = ma

F = m × (v - u) / t

F = mv - mu / t

mv - mu = change in momentum

The largest possible distance between speaker B and the observer at C is 1.37 m.

The largest possible distance between speaker B and the observer at C occurs when the difference in travel distances is just one half wavelength.

λ = v/f

λ = (343)/125

λ = 2.744

¹/₂λ = ¹/₂(2.744) = 1.37 m

Thus, the largest possible distance between speaker B and the observer at C is 1.37 m.

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The point that shows the prevailing westerlies is the wind belt labelled with 1.

Prevailing westerlies is the average or normal westerly winds of the middle latitudes.

From the given image of  wind belts, 1 represents winds in middle latitudes that originate from high pressure.

Thus, the point that shows the prevailing westerlies is the wind belt labelled with 1.

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Answer:

A. 1

Explanation:

This question involves the concepts of induced emf and magnetic field.

The wire has to move at a speed of "20 m/s".

The emf induced in a current carrying conductor when it passes through a magnetic field is given by the following formula:

[tex]E = vBl\\\\v=\frac{E}{Bl}[/tex]

where,

Therefore,

[tex]v=\frac{10\ volts}{(2.5\ T)(0.2\ m)}[/tex]

v = 20 m/s

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Answer:

Option c: wind and clouds

Answer:

Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

Explanation:took the test in 2nd grade

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:

Sodium ions

Explanation:

Please click crown below my answer.

Answer:

b. they get blown in from colder or warmer areas.

Answer:

Option b.

Hope it helps

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:

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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The slowing force of friction due to ice on the given sled on the ice is determined as 40 N.

The slowing force of friction due to ice can be determined by using Newton's second law of motion as follows;

F = ma

where;

F = 100 x 0.4

F = 40 N

Thus, the slowing force of friction due to ice on the given sled on the ice is determined as 40 N.

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one of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity and that include radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.