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acceleration will be g = 10m/s²

and since at the highest point , the ball stops so velocity will be 0

can u please explain the answer plz

time taken to reach the top most height ,where ball stops = V = u-gt => 0 = 20-10t => t = 20/10 = 2sec..

so , out of 6 sec the ball takes 2 sec to go up.. and it will again take 2 sec to reach the same level , during descending..

so, during fall down.. the time left is (6-2-2) = 2sec

and the velocity will be same as 20 m/s for descending also.

so, the H = u*t + 1/2*(g)*t² = 20*2 +10/2*(2)² = 40+20 = 60 m

but if g=9.8 what is the final answer

unit is known standard quantity with other physical quantities are measured

neutral particles having no charge.

A unit is any standard used for comparison in measurements. Unit conversions allow for measurements of a property that have been recorded using different units (e.g.,centimeters to inches).

Unit Examples

Themeteris one standard of length. Aliteris a standard of volume. Each of these standards can be used to compare with other measurements made using the same units.

Electrical energy is a form of energy resulting from the flow of electric charge. Energy is the ability to do work or apply force to move an object. ... The movement of charged particles through a wire or other medium is called current or electricity. Unit: jouleElectric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Electric power is usually produced by electric generators, but can also be supplied by sources such as electric batteries.Unit: Watt

1/(x-1) > 1/(x+1)

=> x+1> x-1 ........ ( but x-1≠0 or x ≠1)=> 1> -1 which is always true..

so, for all values of x this inequality will be true except x≠1.x belongs to R -{1}

the other team is doing the work of pulling on the team which is going towards them

Inphysics, aforceis said to doworkif, when acting, there is adisplacementof the point of application in the direction of the force. For example, when a ball is held above the ground and then dropped, the work done on the ball as it falls is equal to the weight of the ball (a force) multiplied by the distance to the ground (a displacement). When the force is constant and the angle between the force and the displacement is θ, then the work done is given byW=Fscos θ.

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Commercially, kilowatt hour (kWh) to expressenergy. 1 kWh is the amount ofenergyconsumed by an electrical gadget in one hour at the rate of 1000 J/s or 1kW.

1 J is the amount of work done by a force of 1 N on an object that displaces it through a distance of 1 m in the direction of the applied force.

Dielectric constant of a mediumisdefinedas the ratio of thecapacitanceof acapacitorwith the dielectricas themediumto its capacitancewith vacuum between its plates.

Its SI unit is the radian persecondper tesla (rad⋅s−1⋅T−1) or, equivalently, the coulomb per kilogram (C⋅kg−1). The term "gyromagnetic ratio" is often used as a synonym for a different but closely related quantity, theg-factor. Theg-factor, unlike the gyromagnetic ratio, is dimensionless

In SI units, B is measured inteslas(symbol: T) and correspondingly ΦB(magnetic flux) is measured inwebers(symbol: Wb) so that a flux density of 1 Wb/m2is 1tesla. The SI unit ofteslais equivalent to (newton

Work : Workdone is defined as product of the force and the distance over which the force is applied.Workis done when a force is applied to an object and the object is moved through a distance. For example, whenyoulift a loadyouare applying a force over a distance soyouare doingwork. SI unit is Joule.

Power : Poweris the rate (energyamount per time period) at which work is done orenergyconverted. TheSI ofpoweris the watt (W), which is equal to one joule (energyamount) per second (time period).

Energy : The capacity or power to do work, such as the capacity to move an object (of a given mass) by the application of force.Energycan exist in a variety of forms, such as electrical, mechanical, chemical, thermal, or nuclear, and can be transformed from one form to another. SI unit is Joule

C0 = kAE0/d

when another di-electric is introduced in A/3 area , then they will appear as two capacitors in parallel

so, c1 = 2k(A/3)E0/d = 2/3C0 and c2 = k(2A/3)E0/d = 2/3C0

in series, the Equivalent C = c1+c2 = 4/3C0

so, ratio of C0/C = 1/(4/3) = 3/4 option 4

दो तीन और प्रश्नन और है उनका भी उत्तर दे दीजिए

wow

are u in 8 th std

Let x= increase in lenght of string

Then the particle moves along the circular path.of radius (l+x)

and the spring force =kx=centripatal force

Therefore mω²(l+x)=kx

or x=mω²(l+x)/k-mω²

wrong answer

area =l×b =15×4 m^2 =60 m^2

the correct answer is option c qutb ud din aibak

the answer of the question is potion "c"

RADAR stands for Radio Detection and Ranging System. It is basically an electromagnetic system used to detect the location and distance of an object from the point where the RADAR is placed.It can beusedto detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.

acceleration of block due to gravity on the plane is given by; a = g SinΘ - f / m a = g SinΘ - µR CosΘ / m a = g SinΘ - µmg CosΘ / m a = 9.8 x Sin 30 - µg CosΘ a = 4.9 - (0.2)(9.8) Cos (30) a = 4.9 - 1.697 a = 3.20 m/s^2 t = ? If S = 6.4m S = Ut + 1/2at^2 .................. U = initial velocity = 0 at the top of inclined plane 6.4 = 0 + 1/2(3.2)t^2 6.4 = 1.6t^2 => t^2 = 6.4 / 1.6 => t^2 = 4 => √ t^2 = t = 2 seconds

thank you very much

Ans :- In physics, motion is a change in position of an object over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, time, and speed. Momentum is a quantity which is used for measuring the motion of an object.

Stars twinklebecause they appear as tiny pinpoints as seen from Earth, even through telescopes.Planetsdon'ttwinkle because they are closer, and thus appear larger in our sky, as tiny disks instead of pinpoints.

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Stars twinklebecause their light must pass through pockets of Earth's atmosphere that vary in temperature and density, and it's all very turbulent. On rough nights, a star appears to shift position constantly as its light is refracted this way.

the digital thermometer gives accurate temperature on any unit °f or °C. while mercury thermometer analog thermometer. it is giving accurately answer.

The twinkling of a star is due to atmospheric refraction of starlight. The starlight, on entering the earth's atmosphere, undergoes refraction continuously before it reaches the earth. The atmospheric refraction occurs in a medium of gradually changing refractive index.

In 1811 an Italian chemist Amedeo Avogadro stated that “ equal volumes of gases at the same temperature and pressure contain the same number of molecules regardless of their chemical nature and physical properties”. This number is calledAvogadro’s number.

avogardo number is equal to 6.023*10^23

In science, a hypothesis is an idea or explanation that one can test through study and experimentation. Outside science, a theory or guess can also be called a hypothesis. Thus, a hypothesis is something more than a wild guess but less than a well-established theory.

Ans :- Alaseris a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".

Applicationsin Medicalapplications, welding and Cutting, surveying, garment industry,lasernuclear fusion, communication,laserprinting, CDs and optical discs, spectroscopy, heat treatment, barcode scanners,lasercooling.

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Weiss theory of ferromagnetism

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.

Temperature dependence:It is shown that the thermal decrease of the spontaneous magnetization of iron differs characteristically depending on the preparation conditions. In all cases, the deviations from saturation at absolute zero can be accurately described by a single temperature power termTεwhich holds up to several hundreds of kelvins. The empirical exponents areε = 2for crystalline bulk iron,ε = 3/2for amorphous iron as well as for isotropic (crystalline) two-dimensional iron films, butε = 5/2for inhomogeneous (pseudomorphic) monatomic layers. In crystalline films which are sufficiently thick (~100–300 nm) to allow the excitation of standing spin waves, theT2bulk law is confirmed for the uniform precession mode, but for states with a periodically modulated magnetization due to spin wave resonance, aT3/2dependence holds. For ultrathin iron films with more than three atomic layers, a thermodynamic crossover fromT3/2toT2is observed at higher temperatures. This is indicative of a dimensionality change of the relevant interactions from 2 to 3. Crystalline and amorphous bulk iron also exhibit a crossover, but only for the amplitude and not for the exponent of theTεlaw. This is assumed to be caused by the thermal variation of the magnetic interaction strength. All observed empirical exponentsεfit into a recently proposed scheme of universality classes for the low-temperature behaviour of the order parameter in materials with half-integer spin quantum number and three-, two-and one-dimensional interactions. It can therefore be concluded that the thermodynamics of iron is like that of an insulating material withs= 1/2.

it remains the same.

10grams or 0.01kg of bullet with speed 400 m/sec and 5kg gun recoil with speed suppose ‘v’.

0.01×400=5×v

4/5=v

v=0.8m/sec ANSWER.