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a) Electric power is the electricalwork doneper unit time .That is ,

Power = Workdone / Time taken

= W/t

The S.I. unit of electric power is watt which is denoted by the letter W.Thepower of 1 watt is a rate of working of 1 joule per second.That is,

1 watt = 1 joule/1 second

(b)Expression for Power in terms of V and I

We know that :

Power = Work done/Time taken

or P = W/t

the work done W by current I when it flows for time t under a potential difference V is given by :

W = V x I x t joules

Putting this value of W in equation P = W/t,we get :

P = V I t / t joules per second

or Power,P = V x I watts

where V = Potential difference (or Voltage) in volts

and I = Current in amperes

Thus,the power in watts is found by multiplying the potential difference in volts by the current in amperes.

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In first case when charged straw brought near similar charged straw then repulsion will occur between these straws. and when charged straw is brought near to dissimilar charged straw, then attraction will be observed because like charges repel and unlike charges attract.

Time Dilation Formula. Special relativity states that time can pass at different rates in different reference frames. The time depends on the velocity of one reference frame relative to another. In one reference frame, two events (for example, two ticks of a clock) will occur at the same position

The speed of light is very close to 300,000 km per second (186,300 miles per second). It isn't until we get to speeds that are a large fraction of the speed of light that any change in the flow of time becomes apparent. However, at speeds very close to that of light the effect grows in magnitude very rapidly indeed until time almost comes to a standstill.This slowing down of clocks due to high speeds is called time dilation and has a precise mathematical relationship. For the sake of completeness I have included the relevant equation below but you can skip over it and move on to the graph below it if you prefer. The equation for time dilation is

Given:→E=(→i20+→j30)N/CE→=(i→20+j→30)N/C→r=(2→i+2→j)r→=(2i→+2j→)So,V=−→E.→rV=-E→.r→⇒V=−(→i20+30→j).(2→i+2→j)⇒V=−(2×20+2×30)=−100V

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We can now interpret what is happening withthe glass/plasticrodexperiments.Glasshappens to lose electrons easily, andsilkgrabs them away fromthe glassatoms, so afterrubbing the glassbecomes positively charged and thesilkbecomes negatively charged.

An electron that is transitioning between two atomic states does not skip any intervening space. The idea of a quantum leap is highly misleading and commonly misunderstood. First of all, an electron is a quantum object. As such, it acts both as a wave and as a particle at the same time. When bound as part of an atom, an electron mostly acts like a wave. An atomic electron spreads out into cloud-like wave shapes called "orbitals". If you look closely at the various orbitals of an atom (for instance, the hydrogen atom), you see that they all overlap in space. Therefore, when an electron transitions from one atomic energy level to another energy level, it does not really go anywhere. It just changes shape. The orbital shapes with more fluctuations (with more highs, lows, and bends to its shape) contain more energy. In other words, when an electron transitions to a lower atomic energy level, its wave shape changes to have less kinks in it. But the electron does not "leap" anywhere.

Shown here are important electron transitions in the hydrogen atom. When an electron transitions between atomic states, it does not instantaneously leap. Public Domain Image, source: Christopher S. Baird.The wave behavior of an electron in an atom is very similar to the behavior of classical waves on a guitar string. When you pluck a guitar string, you excite standing waves in the string, which are what make the sound. A certain string can only experience certain types of standing waves because the string is clamped down on both ends. The types of waves allowed on a particular string are called its "harmonics". The harmonics of a string depend on the string's length, tension, and mass density. A particular guitar string (of a particular length, tension, and mass) can therefore only play a certain type of sound, which is a combination of its harmonics.

Angular velocitymaynotbe conserved. ...If the body isrotating aboutitsaxis of maximum moment of inertia oritsaxis of minimum moment of inertia, thentherotationisstable andthe angular velocity willbeconstant. Otherwise,therotationwill notbe stable, even thoughthe angularmomentum must be conserved.

For a projectile in 2-dimensions, we have the path equation as:

y = x tanФ - gx² sec²Ф /2u² u = initial speed, Ф = angle of projection x = horizontal displacement, y = vertical displacement

We assume that the tower height 100 m is the maximum height achieved by the bullet. Then the distance 200m will be equal to half of the range of the bullet.We know : H = u² Sin²Ф/2g 100 = u² Sin²Ф /(2*10)=> u² sin²Ф = 2,000 --- (1)

R = u² Sin2Ф/g 2*200 = u² Sin2Ф/10=> u² Sin2Ф = 4,000 --- (2)

(2)÷ (1) => TanФ = 1 => Ф = 45°

Let D be the point of projection and AC be the pole and B be the point where it reaches the ground.Then,CD=39.2BD=2*39.2=78.4Given that the body passes over the vertical pole 19.6mThenTaking downward motion from A to Bt=root of (2h/g)=root of (2*19.6/9.8)=2sTaking motion from D to a to BTime of flight=(2usinN) /g N (angle of projection)time of ascent=time of descent=usinN/g=usinN=19.6Taking horizontal motion from D to BucosN*Time of flight=78.4ucosN=78.4/2*2=19.6Then usinN/ucosN=19.6/19.6=1implies tanN=1then N=45We know range is maximum when N =45Then u^2sin2N/g=78.4Solving we get u= 27.7m/s

TheSolar Systemis thegravitationallyboundplanetary systemof theSunand the objects that orbit it, either directly or indirectly. Of the objects that orbit the Sun directly, the largest are theeight planets,with the remainder being smaller objects, such as thefive dwarf planetsandsmall Solar System bodies. Of the objects that orbit the Sun indirectly—themoons—two are larger than the smallest planet,Mercury.

The collection of eight planet and their moon in orbit round the sun, together with smaller bodies in the form of asteriods,meteoroids and comets.

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Option (3) is correct.

The major difference between both the products is that dot product is a scalar product, it is the multiplication of the scalar quantities whereas vector product is the multiplication of vector quantities. their function can be understood either algebraically or mathematically. The dot product is known as scalar product whereas the cross product is known as vector product. they both vary in the calculation and their implemented applications.

Cross product and dot product are two different types of vector product. Cross product of two vectors always gives a vector quantity whereas dot product gives scalar quantity.Let us consider two vectorsAandB.Taking dot product ,A•B =ABcosß , where ß is the angle between vectorsAandBand A and B are magnitudes of vectorsA and Brespectively. The result is a scalar quantity.Taking cross product,A×B=AB sinß â , where ß is the angle between vectors A and B and A and B are magnitudes of vectors A and B respectively. Here â denotes the direction of resultant vector which is always perpendicular to given two vectors. Here the product gives vector quantity.

angle made by 3i+4j+12k with x axis is

cos∅ = 12/(√3²+4²+12²) = 12/13∅ = cos-¹(12/13)

option D

Work done is defined as (constant) force (applied) * distance (applied over)

Power is defined as work done per second = force * distance / time

But, distance / time = velocity, so :

Power = force * velocity

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option a.

explain it

Dil Le Koi rokna tha kya hoga hoga Gaya pardesiMera sochna tha

a right answer hoga

Mass of the ball=70 gInitial Velocity(u)=0.5 m/sFinal velocity(v)=0Change in momentum=m(v-u)=-70×0.5×10⁻³=0.035 kgm/sTime taken=0.5 s∴Force applied to stop the ball=change in momemtum/time taken=0.07 N

voltage drop between p and q will be 3

how???

1+6= 7 amperewith the help of the kcl

He does that to gain some momentum so that he exerts more force on the javelin.

he does that to get some momentum and gain the force to throw the javelin

Zero relative velocity means the two objects are either stationary (both), or they are separated by the same displacement all the time. That also means that they both have the same speed, velocity and acceleration. They move in the same direction.

So the acceleration - time graph will be exactly same for both. The velocity - time graph will be identical too.

The displacement (or position) - time graph will show two parallel curves, separated by a vertical difference (b-a) as in :

s1 = a +u t + 1/2 a t^2 s2 = b + u t + 1/2 a t^2

Frequency/PitchAmplitude/LoudnessSpectrum/TimbreDurationEnvelopeLocation

The sound waves are generated by a sound source, such as the vibrating diaphragm of a stereo speaker. The sound source createsvibrationsin the surrounding medium. As the source continues to vibrate the medium, thevibrations propagateaway from the source at the speed of sound, thus forming the sound wave.

Sound Board is Multiple Reflection, Sonometer is Resonance, Sonar is Echo, Seismograph is Richter Scale.

It's true that the weight of the column of air above us is very heavy. ... However, the reason we, nor other objects, are crushed by the weight of this air is because this external pressure is balanced by our internal pressure, which arises from various fluids and materials we are composed of.

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Wheniceplaced atzero degreeCelsius, latent heat absorbed by theiceis greaterthanthe same heat absorbed by thewaterat same point of temperature that iszero degreeCelsius. This is the reason whyiceiscolder thanthewateratzero degree.

No it doesn't occur due to dispersion.

Although the speedchangesand wavelengthchanges, the frequency of thelightwill be constant. The frequency, wavelength, and speed are related by: Thechangein speed that occurs whenlight passes from one medium to anotheris responsible for the bending oflight, or refraction, that takes place at an interface

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refractive index is the property of a medium whether it is denser or rarer.

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option a is a correct answer

option A is correct answer

To form the image on the object itself, the object should kept at the center of curvature of a concave mirror and 2 rays are drawn:-1.One which is parallel to the principle axis and passes through the focus 'F after reflection.2.Another which through the focus of the concave mirror becomes parallel to the principle axis after reflection.

Refraction oflightis thechangeindirectionoflightwhen it passes from onemediumto another obliquely. ... When thelightrays coming from the tip of the magic wand pass from water to air, theychangetheirdirection, that is, they get refracted.

M = 2.00 gm Δm = 0.01 gmV = 5.0 cm³ ΔV = 0.1 cm³d = m/V = 2/5 = 0.40 gm/cm³

density = d = m/V => Δd / d =Δm / m + ΔV/ V = 0.01/2 + 0.1/5 = 0.025Δd = 0.025 * 0.4 = 0.01 gm/cm³

d = 0.40 +- 0.01 gm/cm³

The primary reason why thecolor red isusedfordangersignals is thatred light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of acolor. ... Sored light is able to travel the longest distance through fog, rain, and the alike.