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The watt (symbol: W) is a unit ofpower. In the International System of Units (SI) it isdefinedas a derived unit of 1 joule per second, and is used to quantify the rate of energy transfer.

Commercial Unit of Energy. The SIunitjoule is too small to express verylargequantities ofenergy. Hence we use abigger unitcalledkilowatthour (kWh) to expressenergy. 1kWhis the amount ofenergyconsumed by an electrical gadget in one hour at the rate of 1000 J/s or 1kW.

a)The planets are much closer to the earth, and are thus seen as extended sources. If we consider a planet as a collection of a large number of point-sized sources of light, the total variation in the amount of light entering our eye from all the individual point-sized sources will average out to zero, thereby nullifying the twinkling effect. Hence, the planets do not twinkle.

b)Thesky appears dark instead of blue to anastronautbecause thereisno atmosphere in the outer space that can scatter the sunlight. As the sunlightisnot scattered, no scattered light reach the eyes of theastronauts and thesky appears blackto them.

thank u .last answer pls?

As the wave length of light reduces, the refractive index increases.

The refractive index is maximum for the colour corresponding to the lowest possible wave length in the visible spectrum.

The refractive index is maximum for violet colour.

1

The coefficient of friction of jute on jute is much more than that of silk on silk. Hence, two strands of a jute rope can 'grip' each other much more strongly than two strands of a silk rope. This makes it easier to tie a knot in a jute rope as compared to that in a silk rope.

If the elevator was stationary the force would be: mass×"g"Since the elevator is accelerating, the force is

m × (g - a) = .5kg × (9.81m/s²-2m/s²) = 3.9kgm/s² = 3.9 Newtons

thanx but can u pls also answer the second part

Power= Force*Distance/Time

Power by A=400*8/20=1600 N/m^2

Power by B=400*8/50=640 N/m^2

The less abundant chargecarriersare calledminority carriers; inn-type semiconductorsthey are holes

Afinal control elementis a device that directlycontrolsthe value of the manipulated variable of acontrolloop. Often thefinal control elementis acontrolvalve (ANSI/ISA-5.1-1984, revised 1992).

Since force = mass x accelerationso 450 = 30 x acceleration or acceleration = 15 m/s^2

100N plz inform me whether i am right or not

you are right

ok thanks for telling u want solution?

plz post properly wt of a man is not clear

vani wt. of man is not required

provide me the solutin

if man wt is not given then three variables will be unknown with 2equations

see system will be in rest only when 300N force is applied by man and so the reading cannot be greater than 300N or more.

is thiss. the wt shown by the machine

yeah read the question carefully bro

i need a fbd may be the question is posted i agree that tension will be 300N bt W?

wait for 1 min plz

ok broo i got itt thnks

okk sis

A method of transmitting signals, such as sound or digital information, in which the value of the signal is given by the amplitude of a high frequency carrier wave. In AM radio transmission, for example, the signal to be carried is a sound wave, and its increasing and decreasing value is reflected in the increasing and decreasing amplitude of the radio frequency carrier wave. In fiber optics, the carrier wave is a beam of light.

place send in Bengali

I don't know bengali

modulation factor:Inamplitude modulation, the ratio of the peak variation actually used, to the maximum design variation in a given type of modulation. (188)Note:In conventional amplitude modulation, the maximum design variation is considered that for which the instantaneous amplitude of the modulatedsignalreaches zero. When zero is reached, the modulation is considered 100%.

Modulation

Modulation is an important step of communication system. Modulation is defined as the process whereby some characteristic (line amplitude, frequency, phase of a high frequency signal wave (carrier wave) is varied in accordance with instantaneous value intensity of low frequency signal wave (modulating wave.)

Need for modulation: –

i)To separate signal from different transmitters :-

Audio frequencies are within the range of 20 Hz to 20 kHz. Without modulation all signals at same frequencies from different transmitters would be mixed up. There by giving impossible situation to tune to any one of them. In order to separate the various signals, radio stations must broadcast at different frequencies.

Each radio station must be given its own frequency band. This is achieved by frequency translation as a result of modulation process.

ii)Size of the antenna : –

For efficient transmission the transmitting antennas should have length at least equal to a quarter of the wavelength of the signal to be transmitted. For an electromagnetic wave of frequency 15 kHz, the wavelength λ is 20 km and one-quarter of this will be equal to 5 km. Obviously, a vertical antenna of this size is impractible. On the other hand, for a frequency of 1 MHz, this height is reduced to 75 m.

Also, the power radiated by an antenna of lengthlis proportional to (l/λ). This shows that for the same antenna length, power radiated is large for shorter wavelength. Thus, our signal which is of low frequency must be translated to the high frequency spectrum of the electromagnetic wave. This is achieved by the process of modulation.

iii)To Reduce Antenna Height.(practicability of antennas height).

iv)Transmit The Information To long Distance Without interference.

v) Reduce band width.

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Modulation is a process of changing the characteristics of the wave to be transmitted by superimposing the message signal on the high frequency signal. In this process video, voice and other data signals modify high frequency signals – also known as carrier wave.

Modulation is the process of modifying one or more characteristics of a periodic waveform(carrier wave) with a modulating signal.

In the modulation process, the characteristics of the carrier signal is changed but the message signal characteristics will not be changed.

Need for modulation : –

i) To separate signal from different transmitters :-

Each radio station must be given its own frequency band. This is achieved by frequency translation as a result of the modulation process.

ii)To Reduce Antenna Height. (practicability of antennas height).

iii)Transmit The Information To long Distance Without interference.

iv) Reduce bandwidth

Modulation factor: The ratio of change of amplitude of carrier wave to the amplitude of basic carrier wave.

Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to that of the message signal being transmitted.

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Modulationallows us to send a signal over a bandpass frequency range. If every signal gets its own frequency range, then we can transmit multiple signals simultaneously over a single channel, all using different frequency ranges. Another reason tomodulatea signal is to allow the use of a smaller antenna.

46.67m

plz inform me whether i am right or not

it's wrong

whats the correct answer

200m

see i can give my explanation .it can use 28%of its energy for climbing so energy used will be 28000J now equate it with 600h because his work will be converted into potential energy

thanks

Pulse Amplitude Modulationis one of the kinds ofmodulationtechniques used in signal transmission.Pulse amplitude modulationis the simplest form ofmodulation. It is Analog to digital conversion method where the message information is encoded in theamplitudeof the series of signalpulses.

Pulse Amplitude Modulationis one of the kinds ofmodulationtechniques used in signal transmission.Pulse amplitude modulationis the simplest form ofmodulation. It is Analog to digital conversion method where the message information is encoded in theamplitudeof the series of signalpulses.

Tachycardia is considered aheart rateof greater than 100beatsper minute. If you are exercising, or performing any kind of activity, yourheartwill normally beat faster. This allows yourheartto pump blood through out your body, to provide oxygen to the tissues.PLEASE LIKE ❤

while running , while watching interesting episodes of daily serials , while playing running games , while playing pubg , there will be more heart beat rate (pulse) due to tension

Physics is a natural science based on experiments, measurements and mathematical analysis with the purpose of finding quantitative physical laws for everything.It is study of matter and energy, is an ancient and broad field of science. The word 'physics' comes from the Greek 'knowledge of nature,' and in general, the field aims to analyze and understand the natural phenomena of the universe

Physics is the natural science that studies matter and its motion and behavior through space and time and that studies the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves.

In multiplication or division, percentage errors are simply addedSince R=V/I

% error in R= % error in V + Percent error in I = 3%+3% = 6 %

yes because ,If you hold a compass near awire through whichcurrentisflowing, the needleonthe compasswillbe deflected.

yes, it will okhope it helps u

yes because ,If you hold a compass near awire through whichcurrentisflowing, the needleonthe compasswillbe deflected.

yes it give rise to a magnetic field around it

The flow of electric charge is electric current. The charge of 1C consists 6.25×10^18 electrons.Now, total no. of electrons flowing per second is 62.5×10^18so, total quantity of charge flowing per second is (62.5×10^18)/(6.25×10^18)=10 CThe quantity of charge flowing per second gives value of current.since, 10 C of charge flows per second ,so, current is 10 A

2.6 metre answer hoga.

2.6m is the correct answer

1

2.6m anslet boy h=1.5 angle was 30'so tan 30=1 √31.5*√3and answer was 2.6m

thanks bro

Amplitude is a measure of the size ofsoundwaves. Itdependson the amount ofenergythat started the waves. Greater amplitude waves have moreenergyand greaterintensity, so theysoundlouder.

thanx

1st Law : Every body continues its state of motion until and unless an external force acts on it,

Example : Tennis ball continues its motion until another player strikes it !

2nd Law : The acceleration is produced when there is a net Force change on the body, Actually the 2nd law is used to derive Force Formula,

Example : The harder you hit, The more faster the ball travels,

3rd Law : For every action there is equal and opposite reaction,

Example : If you hit a ball with racket, The ball also applies same momentum on the racket so we feel a small backwards push in our body,

Vibration is defined as a rapid to and fro or up and down movement about a mean position.

Vibration, is a mechanical phenomena which results in periodic back-and-forth motion of the particles of an elastic body or medium, commonly resulting when almost any physical system is displaced from its equilibrium condition and allowed to respond to the forces that tend to restore equilibrium.

Ans :- A complete cycle ofvibrationoccurs when the object moves fromoneextreme position to the other extreme, and back again. The number of cycles that avibratingobject completes inonesecond is called frequency. The unit of frequency is hertz (Hz).

a force applied to an object always has only one kind of effect? - false

false because force always one kind of effect

the correct answer is false

Acompletecycle ofvibrationoccurs when the object moves fromoneextreme position to the other extreme, and back again.

Ans :- FalseThe number of oscillations per second of a vibrating object is known as its frequency.

Loudness of asoundis proportional to the square of the amplitudeof itsvibration. When the amplitude of vibrationof asoundis large, thesoundis very loud. The sound is feeblefor smallamplitude.

Effect of heat seen in our daily life:

# When you move out of the house,under the hot scorching sun, you sweat a lot because your body absorbs heat from the sun

# Ice cubes when kept out of the refrigerator melts, since it looses heat to the surrounding

# Wet cloths spread , outside dries, as the water from the cloths evaporates.

thanku

please help me in my exams