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Angular mometum of a body about a given axis is the product of linear momentum and the perpendicular distance of line of action of linear momentum vector from the axis of rotataion.

Capillary action is an essential part of our day to day life.

1) This process is essential for the plants and trees to survive. The water (mixed with nutrients) reaches to the roots from the soil through this process.

2) Capillary action is also essential for the drainage of constantly produced tear fluid from the eye.

3) The ink through the pen flows onto the paper by the capillary action and hence we are able to write.

STRESS=FORCE/AREA. As in a escalator accelerating upward, tension in string is T=mg-ma, T=8(10-2.2)=8x7.8.

STRESS=8x7.8/3x10-6. STRESS=20.8x106N/m2.

heat energy of an object is the SUM of all the kinetic energies of the molecules of the object (upto constant factor).

The temperature on the other hand is the AVERAGE of the kinetic energies of all the molecules of the object.

Now when ice is melting at 0 degrees Celsius, the temperature as measured on a thermometer does not go up.

The common explanation is that any heat being absorbed by the ice is being used to break the somewhat strong solid solid bonds between the molecules of the ice.

Heat is not a property of a system. Heat is a process function. Temperature is a property of a system because is a state function. For instance, the state of a simple gas is given by temperature, pressure, and composition(T,p,N)(T,p,N).Temperature is defined as the inverse ratio of variation of entropySSto changes in internal energyU

The fundamental difference between heat and temperature is slight but significant, heat is the overall energy of the molecular motion, whereas temperature is the average energy of the molecular motion.

Heat-Total kinetic and potential energy contained by molecules in an object.Temperature- Average kinetic energy of molecules in a substance.

Evaporation is a surface phenomenon because it occurs in the surface. For example when weput wet clothes for drying we spread them out so that the surface area gets increased. When the surface area increases the water will get enough space to get into vapour stage and thus evaporation happens easily. This is why increase in surface area is a factor of evaporation.

Green grass appears a green colour in red light.

2)

3) where ip is polarizing angle . substitute the value to get the answer.

The primary reason why the colorredis used fordanger signalsis thatred lightis scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color

Z= xy bar + y x barother gate will giveand operationso from one xy bar and from secondx bar yXORgate

•Electric intensity is the strength of electric field at a point.•Electric intensity at a point is defined as the force experiencedper unit positive charge at a point placed in the electric field.•It may also be also defined as the electrostatic force per unitcharge which the field exerts at a point.•Mathematically,E=F/q•You can correlate it with gravitational field intensity that from a certain distance away from earth, how intensively or forcefully it is pulling you towards its center.

A continuous time signal is an analog representation of a natural signal, with characteristically smooth transitions between peaks and valleys. A discrete time signal is a digital representation of a continuous signal, it has a magnitude that is held constant for the duration of each sample, otherwise known as a zero-order hold. The main difference between the two signals is the zero order hold— the discrete signal can be considered a copy of its counterpart continuous signal, but with added noise.The advantage of the discrete signal is that it is a repeatable signal, with digital fidelity between successive generations, the disadvantage is the added noise which colors the signal. Typically this noise is smoothed out using an RC circuit, with a time constant determined by the Nyquist frequency of the discrete signal.

hence put in the valuesp=4*1.5/1*10^-2=6*10^2N/m^2

Thanks...

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2

ontion (2) is correct.

or koi trick bhi h

but answer is 0.1

We will use conservation of linear momentum for that

m1v1 = m2v2 => (1.5kg)*(1.5) = (0.005)*(Vb)=> Vb = 1.5*1.5/(0.005) = 450m/s. ( in opposite direction)

Given, Weight = 40N and mass= 50 Kg.

We know that, F=ma

40N = m x g

40/g = m

40/10 = m

4kg = m

mass = mass of man + mass of bag

= 50 + 4

= 54 kg

Force with which the floor pushes up his feet, F = ma

F = 54 x g

F = 54 x 10

~= 540N.

so option(b) is the correct answer

weight of man = 50*9.8 = 490N

and weight of bag = 40N

so, total weight exerted by floor is reaction force of (490+40) = 530N

option 2.

Camels have broad feeti.e.,feethaving alarge areso that the pressure exerted on the sandisless due to their heavy weight. Therefore,camels donot dig deep in the sand dunes andcanmove freely.

The electromagnetic spectrum is a continuum of all electromagnetic waves arranged according to frequency and wavelength. The sun, earth, and other bodies radiate electromagnetic energy of varying wavelengths. Electromagnetic energy passes through space at the speed of light in the form of sinusoidal waves.

Light is a particular type of electromagnetic radiation that can be seen and sensed by the human eye, but this energy exists at a wide range of wavelengths. The micron is the basic unit for measuring the wavelength of electomagnetic waves. The spectrum of waves is divided into sections based on wavelength. The shortest waves are gamma rays, which have wavelengths of 10e-6 microns or less. The longest waves are radio waves, which have wavelengths of many kilometers. The range of visible consists of the narrow portion of the spectrum, from 0.4 microns (blue) to 0.7 microns (red).

The mean period of oscillation will be

T=2.63+2.56+2.42+2.71+2.8/5

=2.62 sec

The errors in the measurement wil be

2.63-2.62=.01sec

2.56-2.62=-.06sec

2.42-2.62=-.2sec

2.71-2.62=.09sec

2.80-2.62=.18 sec

so mean of absolute error will be .11sec

Hence Period of oscillation will be (2.62±0.11)

Therefore T=2.6±.1s

relative error or percentage error is given by

=0.1/2.6*100

4%

Instantaneous power is = force*velocity

dP= ma*v

P=m(dv/dt)*v

Only (P/m)dt= v.dv

Integrating both sides from 0 to t and 0 to v in LHS and RHS respectively

Pt/m= (1/2)v²

v= (2Pt/m)½

so v is proportional to t^1/2option (3)

the answer is b to go 1 round

The velocity will zero as displacement will zero .

the answers is b to go 1 round ok

the velocity will zero as displacement will zero

b is the correct option and please like my answer

we have resistance = 150 Ω

Our tolerance is +- 5%.

This means that the resistor has a range of values between 150 + 150*5% and 150 – 150*5%

So, we can have a resistor as high as 150 + 7.5 =157.5 Ω or as low as 150 – 7.5 = 142.5 Ω

The speed of light is 299792458m/s. For this case, we will use the approximation 3.0*10^8m/s.

Since frequency = speed/wavelength:

Frequency of light = (3.0*10^8)/600nm= (3.0*10^8)/[600*10^(-9)m]= 5.0*10^14 Hz

When light changes medium, only the wavelength changes, not the frequency. So, the answer is 5.0*10^14 Hz.

the answer is 0.319%

3.13 cm it is correct answer

it is correct answer

(a)As the key is closed, the galvanometer needle will deflect for a moment and then return to zero.(b)As the key is removed ,again a momentary deflection (but more) because of the change in magnetic flux linked with the coil is observed in the galvanometer in opposite direction .(c)With the key closed ,if the coil A and B are moved with the same speed in the same direction ,there is no deflection in the galvanometer because there is no change in the magnetic flux linked with the coil a.The phenomenon involved is Electromagnetic induction.

Uniform Motions:-

1.Thehour hand of a clock- It moves with uniform speed, completing movement of a specific distance in an hour2.A car going along a straight level road at steady speed3.An aircraft cruising at a level height and a steady speed4.A ship steaming on a straight course at steady speed5.A train going along the tracks at steady speed6.A cooling fan running at a fixed speed7.Earth moving round the sun is an uniform motion8. Movement of fan9. A pendulum having equalamplitudes on both sides10. A vibrating spring in a sewing machine11. Rain drops fall at uniform speed as buoyant forces balances 'g'

Non uniform Motions:-1.A horse running in a race2. A bus on its way through the market3. A bouncing ball4. Movement of an asteroid5. Aircraft moving through the clouds and then landing6. Dragging a box from a path7. A man running a 100 m race8. A car coming to a halt9. A train coming to its terminating sop10. A car colliding with another car.

Total hours in a day = 24it is operated for 6 hoursso power used in 6 hours= 100*6=600 wattnow in 1 one day = 600 wattin leap year(366) days= 600*366= 219600 watt powerwe know that1 unit = 1000 wso number of units = 219600/1000= 2196/10= 219.6

for wavelength 400 nm , energy of each photon be E=hc/lamda

n number of photons will have total energy n(E) ...

power of photon beam is given so

n(E) = 1.5mW .....

n = 1.5/E (number of photons striking per second)

0.1% photons extract electrons so

ne(number of ejected electrons) = 0.1% of n

now photo current = nq=ne (e is electronic charge)I =0.48microampere.

If the time travelled upto the given point by second one is tseconds, the first one has taken t +5seconds.

Since the difference between their distances travelled is 100m,

This program takes a number from user and stores in the fileprogram.txt.

for body 1disp. in 3 second = 1/2*9.8

for body 1 disp. in 3 second = (1/2)9.8×9 = 44.1

for body 2 disp. in 2 second =(1/2)9.8×4 = 19.6

separation after 2 second of leave 2nd body = 44.1-19.6 =24.5 24.5

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