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a) s=ut+(1/2)gt^2 s = 0+(1/2)gt^2 s = (1/2)gt^2 t^2= 2h/g t^2=2×19.6/9.8 t^2=2×2 t^2=4 t= 2s Ans) 2 seconds

b) v^2=u^2+2gh v^2=0+2gh v^2=2gh v^2=2×9.8×19.6 v^2=19.6×19.6 v=19.6 m/s Ans) 19.6m/s

c) s=1/2at^2 a= 2s/t^2 a=2×19.

a) electrical energy to thermal energyb)solar energy to electrical energyc) electrical energy to magnetic energd) chemical energy to mechanical energy

Volume of hemisphere = S.A of hemisphere2/3πr^3=3πr^22/3r=3r=9/2diameter =9/2x2=9

thx

plz he example yet aahe ka

Sphere

hollow cylinder

First break componentsx=at --------(1)y=bt^2---------(2)from equation (1)t=x/aput t value in equation (2)y=b (x/a)^2=bx^2/a^2

hencey=bx^2/a^2=(b/a^2) x^2

force is the correct answer

Force is Correct answe

if the chain is held vertically downward two forces will be acting along the surface of chainone of them is the mass of the chain that is mg acting vertically downward and other is the tension of chain acting vertically upward and canceling the effect of mass pulling it downwardsince acceleration is zero soF(net)=0so mass of chain is m=(L-x)T=mgm=(L-x)/L*mT=[(L-x)/L]*Mg

Scalar Quantities: The physical quantities which are specified with the magnitude or size alone are scalar quantities. For ex- length, speed, work, mass, density, etc.

Vector Quantities: Vector quantities refer to the physical quantities characterized by the presence of both magnitude as well as direction. For ex- Displacement, velocity, Force etc.

Thequantityis either avectoror ascalar. These two categories can be distinguished from one another by their distinct definitions:Scalarsarequantitiesthat are fully described by a magnitude (or numerical value) alone.Vectorsarequantitiesthat are fully described by both a magnitude and a direction.

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Momentum is the quantity of motion of a moving body, measured as a product of its mass and velocity.it formula = mass × velocityso it's SI unit is = kg×m/s = kg m/sHope this helps u

pascal

The SI unit for pressure is thepascal(Pa), equal to onenewtonpersquaremetre (N/m2, or kg. m. s−2). This name for the unit was added in 1971; before that, pressure in SI was expressed simply innewtonspersquaremetre.

Mass is a quantity representing the amount of matter in a particle or object. The standard unit of mass in the International System (SI) is the kilogram (kg)

Multiple units:Mega gram , Giga Gram ,Stone , Ton , Quintal , etc. Used for measuring heavy weights like lorries,flats etc.

Submultiple units:Gram , Centigram , Decigram , Milligram , Nanogram , Microgram , etc.Used for measuring very light weights like bacteria , pins

but how that force will be 2%

Coulomb's law: The electrostatic force between two stationary point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. Importance ofvector form: (1):Vector formgives the direction of the force along with magnitude.Ap

the answer is q1q2 r^/4π£r^2

Coulomb's law:

Theelectrostaticforce between two stationary point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them

3.75 is the right answer

from the figure.. the Frictional force is = 4N after which the block starts to accelerates

so, now at final force = 14N and a = 5

=> F-f = m*a => 14-4 = m*5=> 10 = 5m=> m = 10/5 = 2kg

The direction vector of velocity = (i+j-k)/√(1²+1²+1²) = i/√3 +j/√3 -k/√3

now force has magnitude of 10√3 and the direction vector is same as of velocity

so force vector is (10√3)( i/√3 +j/√3 -k/√3) = 10i+10j-10k

thank you so much brother

Since the image touches the rod, one end of the rod must be at C of the mirror.Since the image is real and elongated, the other end of the rod must be between C and F of the mirror.The distance of this latter ( A) end from the optic center of the mirror is (R-f/3) = 2f-f/3= 5f/ 3(u –f)= 5f/ 3-f = 2f/3m = f/ (u-f) = 3/2 = 1.5

Magnification of the A end of the rod is 1.5 where as the magnification of the joint of image and rod is 1.

Let the Force be Fmass = 5 kgtime(t) = 2 sinitial velocity(u) = 3 m/sfinal velocity(v)= 7 m/sso let the acceleration be aso a = (v - u)/t = (7 - 3)/2 = 2 m/s²

So the magnitude of the applied force is 10 N

and the final velocity after 5 s is v

so v = u + atv = 3 + 2 x 5v = 13 m/s

The final velocity after 5 s is 13 m/s

not correct

Radius of curvature, centre of curvature and pole will be common,butPrincipal axis would not be common.

h1 = +1.2 cmf = +12 cmu = -8 cm

Using mirror formula ;

(1/f) = (1/v) + (1/u)

(1/12) = (1/v) + (1/-8)

1/v = (1/12) + (1/8)

1/v = (2+3)/24

v = 24/5

v = +4.8 cm======================

m = h2/h1 = -v/u

h2 = (-4.8/-8) × 1.2

h2 = + 0.72 cm___________________Hence the image formed is Virtual and erect of size 0.72 cm and at a distance of 4.8 cm from the mirror.

f=14cmu=-21cmv= ?1/f=1/v-1/u1/14 - 1/21=1/v1/v = 3-2/421/v =1/42v= 42cm.

m = v/um = 42/-21m= -2Image is real,inverted and enlarged

Indecomposition reactionsa single substance decomposes to form two or more substances. Incombination reactionin two or more reactants combine to form a single product.

CaO + CO2—> CaCO3+ energy

speech/human voice signals,frequencyranges from 300 Hz to 3100 Hz. Thereforespeechsignal has abandwidthof 2800 Hz.

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thepowerof a transparent medium to separate different colors of light by refraction as measured by the difference in refractivity for two specified widely differing wavelengths divided by the refractivity at some specified intermediate wavelength