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The vectors here are a(i+j+k) and b(i+j+k)

and they are parallel to each other because they have same direction (i+j+k).

and Cross product of parallel vectors are always 0.

so, the value is 0

Apply nodal heregiving you the equationV1/3+V1-V2/2= 10

now V2-V1/2+ V2/1+V2-20-V3/5= 0

V3-20-V2+V3-10/(7/10)

A DC stands for DIRECT CURRENT. DIRECT CURRENT and VOLTAGE has constant amplitude at all time, hence there is no variations in its amplitude and has zero frequency. While the AC stands for Alternating current, which means the voltage and current varies with time. It has different Amplitude at different time. Due to variation it has some constant frequency, which is normally 50 or 60 Hz.

it is identical to snells law in optics but the difference is that order of velocities are reversed. When a light enters from rarer to denser medium it slows and bends to the normal but when electron enters from lower to higher potential it is accelerated and is bend towards the normal.

using mass and charge balance.

19F9 +1H1 → 16O8 + 4He2..... ( helium)

63Cu29 +2D1→ 64Zn30 + 1n0 ... ( neutron)

Ohm's Law:It states that the current through any two points of the conductor is directly proportional to the potential difference applied across the conductor provided that the physical conditions remains constant.Unit:It is measured in ohm represented asΩ.Explanation:When an electric potential difference is applied across the conductor, the current passes through it. Here some of the current is apposed by the resistance of the conductor in the circuit. Thus Ohm's Law is the relation between current, voltage and resistance.According to Ohm's Law:Vα IV = I RWhere R (resistance) is the constant or proportionality.Ohm's Law is applicable only if all the physical conditions for example temperature, material or dimensions of the wire remain constant.

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Formula: S= ut+1/2 at^2

option D is the answer.

B - Anglo IndianThe House of the People (the lok Sabha) has 543 elected members and two nominated seats. Article 331 of the Constitution stipulates that the nominated seats are exclusively for members of the Anglo-Indian community. This provision was made in 1950 in order to reassure the Anglo-Indians that their voice would continue to be heard in Parliament even after the departure of the British. Similarly, Article 333 of the Constitution provides for nomination of one member of this community to the Assembly of a State, where such nomination is deemed necessary. Currently, Anglo-Indians enjoy this privilege in eight State Assemblies

of India is the leader of the ruling party in the Lok sabha

How is heat transferred by radiation?

Radiation heat transfer is the energy that is emitted by matter in the form of photons or electromagnetic waves. Radiation can be important even in situations in which there is an intervening medium. An example is the heat transfer that take place between a living entity with its surrounding.

Radiation refers to the transfer of heat from a hot body to cold body directly, without heating the medium between two bodies. The radiant heat is of the form of electromagnetic waves. These waves can travel in vacuum in all directions in a straight line with the speed of light. Heat radiations are also called infra-red radiations because the wavelength of heat radiations is longer than that of visible light.

They are kept loose in summers so that in winters it does not snap. this happens due to heat.

i hope you know that anyhting when heated expands andcontracts when coooled.

Thus in summers it expands while in winters it contracts and it is kept lose only in summers( ie if it is laid in summer)

m=2/5

First of all, elevators never plummet down their shafts. For the past century, elevators have had a backup break that automatically engages when an elevator starts to fall. If all the cables snapped (highly unlikely), the elevator would only fall a few feet before the safety breaks would activate. The safety breaks are mechanical so that they work even if power is out or no one is around. Secondly, even if a terrorist managed to saw off the huge metal breaks and cut all the cables, the plummeting elevator would land on a cushion of air at the bottom. The elevator shaft traps air much like a giant air bag, which would soften the blow. But the essence of the original question is still interesting.

Jumping at the last second before a plummeting elevator hits the ground would slightly reduce your speed, but not enough to make much of a difference. Public domain image, source: Library of Congress.Imagine that you are standing on a high, heavy, outdoor platform (with holes in it so that air resistance is negligible). Suppose the platform's supports break so that you and the platform fall together. Could you minimize the damage of hitting the ground by jumping off the platform at the last second? If we neglect air resistance, the answer is a weak yes. But because you are both in free fall, you would not really be “jumping” off the platform, but would be pushing it away. By the law of conservation of momentum, pushing the platform downwards will give it some of your momentum and slow you down. (Think of a speeding ice skater pushing another stationary ice skater. The speeding skater slows down.) The platform has to be heavy in order to be able to give it much of your momentum. Pushing against a penny won't do much unless you shoot the penny off at high speed using a gun. But pushing away a heavy platform will give it more momentum.

A light-emitting diode is a two-lead semiconductor light source. It is a p–n junction diode that emits light when activated. When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence, and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor.

Commercial unit of energy is Kwh 1Kwh= 1000 W * 1 hour = 1000 W * 60 * 60 s = 3600* 1000 J = 3.6 * 10^6 Joules

given the volut of water is 800liters

so, mass of water is 800kg ... ( density is 1kg/l)

now 80% of power = Mgh/t => 0.8p = 800*9.8*20/19.6 = 8000=> power = 8000/0.8 = 10000 watt = 10kw

option 3

P= VI cos phior we want to find active powercurrent= 200/440kA= 10/22= 5/11 KA440*5/11*0.85= 200*0.85= 85*2= 170kW

Power = force X velocity

power = 9000 watt

Power of air conditioner = 2 kW = 2000 W (1000 W=1kW)

Potential difference applied = V = 220 V

Fuse rating of the air conditioner = 10 A

Current used by the air conditioner = ?

2000/220V=9.09

10 A > 9.1 A ,Yes the fuse will be able ti withstand ,when the air conditioner is switched on.

Unit of energy = 1 kW.h

Energy consumed = 2*10 kW.h

= 20 kW.h

Cost = 20*7 = 140 rupees

Unit of energy = 1 kW.h

Energy consumed = 2*10 kW.h

= 20 kW.h

Cost = 20*7 = 140 rupees

ii) The current rating of the cell can be increased by increasing "voltage" of the cell by according to ohm's law,

V= IR

V∝ I.

i)V is directly proportional to I , so when current increase voltage will also increase and hence in this way voltage rating can be increased

The current rating of the cell can be increased by increasing "voltage" of the cell by according to ohm's law,

V= IR

V∝ I.

Let a and b be two radiations with same frequency but different intensities.

These two radiations have same stopping voltage.

The higher the intensity the more the photoelectric current emitted.

Let a be of higher intensity and b of lower intensity then the graph is as shown in the image.

•We know that pressure exerted by water in oceans increases with depth.very deep pressure is enough to crush the human body.

That is why deep divers are given to wear special suit, to resist the high pressure.

•When deep sea fishes are brought up to the surface of sea, their bodies flow at very high pressure .At the surface of sea,the pressure outside suddenly decreases due to this difference their body bursts open.

•Submarines are built of hardthick sheets of metal to withstand that high pressure in underwater.

A machine devised to produce a high voltage by means of an endless belt collecting electrostatic charge from a source and transferring it to a large isolated metal dome, on which a large charge accumulates.

The constellation Ursa Major contains the group of stars commonly called the Big Dipper. The handle of the Dipper is the Great Bear's tail and the Dipper's cup is the Bear's flank. The Big Dipper is not a constellation itself, but anasterism, which is a distinctive group of stars.

highly whether y2ueywywhwg51661161662622

correct answer is 2500W

Thedifferent ways to induce current in a coilare as follows: (i) Moving a magnet towards acoilsets up acurrentin thecoilcircuit, (ii) If acoilis moved rapidly between the two poles of a horse-shoe magnet, then an electriccurrentisinducedin thecoil

THANK UN

BUT A QUESTION IS THE ANSWER 2/√3

1/u+1/v=1/f1/v=1/f-1/uu/v=u/f-1= -20cm / -10cm2-1=1u/v=1m=h2/h1=v/uh2=-v/u×h1=1×h1= -1×10=-10cmthe minus sign shows that image is invertedhence the length of the image is 10 cm

less than 7The pH of gastric acid is1.5 to 3.5in the human stomach lumen, the acidity being maintained by the proton pump H+/K+ATPase

Whenyoulight acandle, the heat of the flame melts thewaxnear the wick. This liquidwaxis then drawn up the wick by capillary action. The heat of the flame vaporizes the liquidwax(turns it into a hot gas), and starts to break down the hydrocarbons into molecules of hydrogen and carbon.

Diamagnetism is the property of material which causes it to create a magnetic field in opposition of an externally applied magnetic field, thus causing a repulsive effect.

Paramagnetism is a form of magnetism which occurs only in the presence of an externally applied magnetic field. Paramagnetic materials are attracted to magnetic fields.

Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets and/or exhibit strong interactions with magnets.

To explain the phenomenon of ferromagnetism, Weiss proposed a hypothetical concept of ferromagnetic domains. He postulated that the neighboring atoms of the ferromagnetic materials, due to certain mutual exchange interactions, from several number of very small regions, called domains.

Weiss theory of ferromagnetism is also called domain theory of ferromagnetism. It has following points:

The domains which are aligned approximately along the direction of the applied magnetic field grow in size at the cost of unfavorably oriented domains, that is, those align opposite to the field direction get reduced. In other words, the domain boundaries move so as to expand the favorable domains.Also domains rotate and orient themselves in the direction of the external magnetic field.In the presence of the weak external field, the magnetisation in the material occur mostly by the process of domain growing, but in the strong magnetic field the material is magnetised mostly by the process of domain alignment. When the field is removed, the domain boundaries do not recover their original positions and thus the material is not completely demagnetised, but some residual magnetism remains in it.

¤ = 53°

Angle of projection is 53°

using dimensional analysis

dimension of Force = ML/T²

so, (ML/T²)^(x) = (M²)(L)²/T⁴

=> (ML/T²)^(x) = (ML/T²)²

so, x = 2

option D

Amplitude is the maximum displacement of points on a wave, which you can think of as the degree or intensity of change. ..Atime period(denoted by 'T' ) is thetimeneeded for one complete cycle of vibration to pass in a given point. As the frequency of a wave increases, thetime periodof the wave decreases.

It is only useful or meaningful for musicalsounds, where there is a strongly regular waveform.Frequencyis measured as the number of wave cycles that occur in one second. The unit offrequencymeasurement is Hertz (Hz for short). Afrequencyof 1 Hzmeansone wave cycle per second.

Ans :- Detailedmeasurements of the expansion rate of the universe place theBig Bangat around 13.8 billion years ago, which is thus considered the age of the universe. After its initial expansion, the universe cooled sufficiently to allow the formation of subatomic particles, and later simple atoms.