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gh=gR^2/(R+h)^2

given

gH=g/100

Therefore we have

gR^2/(R+h)^2=g/100

or R+h=10R

or h=9R

answer is bR3/d(R+d)2i.e. if b is the acceleration at the centre of gravity is b.where R is the radius of earth.

Relative speed = 40π - 36π = 4π m/sec

Circumference of the circle = 2π * 20 = 40π cm =0.4π m

Time after which they again meet = 0.4π / 4π = 0.1 sec

Givenacceleration of the particles is g/2=a'

now letacceleration of the lift = a upwards

assume lift at rest and apply psudo force = mass* a to both masses

ER. RAVI KUMAR ROY

Let masses as 2m and m

2m>m so 2m will move downward with a'

So 2mg+2ma-T=2ma'=2m(g/2)=mg .....(1)

and similarly for m mass

T-mg-ma=ma'=m(g/2) .....(2)

Solving both we get

a=(g/2)

Vcm = m*2i +m*2j/(m+m) = i+j

and Acm = m(i+j) +m*0/2m = i/2+j/2

so, Scm = Ut + 1/2*(acm)t²

The is the equation of straight line motion

option D.

Thickness of plate = t Totalmass of circularplate = MDensity of plate = M /(πr₁² t) , r₁ = 28 cm r₂= radius of cut out part= 21 cm

Mass of small circular portion cut out = volume* density =πr₂² t *(M/π r₁² t) m₂ = M r₂² / r₁²

Mass of the remaining part = m3 = M - Mr₂² / r₁² = M (r₁² - r₂²) / r₁²

Let the center of mass of remaining portion be at a distance d from the center of original full plate. From symmetry the center of mass of remaining portion lies along the line joining the center of original plate and the center of removed part.

Let Center of mass of total full plate = 0 0 = 1/M ( d * mass of remaining part + C₁C₂ * mass of removed part) 0 = d *M (r₁² - r₂²) / r₁² + 7 * M r₂² / r₁² 0 = d * (r₁² - r₂²) + 7 *r₂² d = - 7 * r₂² / (r₁² - r₂²) = - 7 * 21² / (28² - 21²) = - 7 *21 * 21/ 49*7 = - 9 cm

Center gravity of the remaining portion is 9 cm to the left of the original center of full plate on the line of symmetry. Or, it is 19 cm from the edge of remaining plate along the line of symmetry.

sristi patna se ho tum

kon Institute me padhti ho

R = ρl/AR' = ρ(4l)/(A/3) = (ρl/A)(12) = 4.25 × 12 = 51 ohm

The work done to break a spherical drop of radius R in n drops of equal size is proportional to[1- 1/n⁰·³³]

Absorption spectrum is an electromagnetic spectrum in which a decrease in intensity of radiation at specific wavelengths or ranges of wavelengths characteristic of an absorbing substance (as chlorophyll) is manifested especially as a pattern of dark lines or bands.

The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state.

Herbs, shrubs and trees.

Light travels faster in air than in glass because air is lighter medium compared to glass which is dense.i.e.glass partially resists the propagation of light through it

(A) wave theory is correct option

plz tell me if it's correct or not

thanks a lot Katana........

Density in CGS system is = 4 gms/ cm³Unit of length = 1 cm unit of mass = 1 gm

Another system of units: unit of mass = gm' = 100 gm unit of length = cm' = 10 cm

=> 1 gm = and 1 cm =

Substitute these values in the value of the density. Now density of the material:

Thus in the new system the value of density will be 40 units.

In FPS system absolute unit of weight is Pound

(B) is correct option

b option is correct 1 pound

Graphite isthe non metalwhich hasmetallic lustre... -->Non metalsare mostly found in nature as Solids, Liquids and gases. --->Non metalsdo not posses themetallic lusterbecause they cannot reflect light due to the absence of free electrons in their structure.

a)Continuousplantation of crops in a field makes thesoilpoor in certain nutrients such as nitrogen, phosphorus, potassium, etc. Plants require nutrients for their proper growth and functioning

b)Fungi thriveindark, moist and warm conditions, which is whybreadwill be become mouldy, more rapidlyduring the rainy season.During the rainy season, the air has a higher moisture content, which is ideal for fungal growth.

c)Saving PaperisSavingthe Forests. ... In just a day, how many millions sheets ofpaperare used by Indonesian people, and thismeansthat there are millions of foresttreesare cut down to meet those needs.

d)Pure goldis 24k and is extremely soft and malleable, thereby making it rare in jewellery.Goldof 20k, 18k and 14k are usuallyusedto makejewellery. The karat value ofgoldis reduced by mixing it with other metals, usually copper or silver. ... However, the value of thegoldalso decreases along with its karatage.

e) This is because the pressure of the water is much greater deeper down and the damneeds to be thick at thebottom so that it is strong enough to withstand this larger pressure.

option (c) is correct.

density in MKS Will 800 kg/m×m×m

800 kg m^-3 is the density in MKS units.

OP tion A

hsjskslalskdkskfkri bshjdisk bdjdiufufrhr grhriririi hrjroro

In total, 43 lead isotopes have been synthesized, with mass numbers 178–220. Lead-205 is the most stable radioisotope, with a half-life of around 1.5×10^7years. The second-most stable is lead-202, which has a half-life of about53,000 years, longer than any of the natural trace radioisotopes

Lead 210 has a relatively short half-life of22.3 years. The amount of210Pb remaining in most samples is statistically insignificant after about seven half-lives.

but this is not in option !!

The formula for centripetal force is

F = mv²/R

sub. v =rw(omega)

F =m r w²

w (angular velocity) will be same as the time period is same......

F1 = m R1 W²

F2 = m R2W²

W(angular velocity) and mass are constant.

F1/F2 = R1/R2.

:- The ratio is R1 :R2.

nhiaya

3/2 omega is correct answer.

option D is correct.

D has the more.. curve surface.. so its focus will be nearest, among all the mirrors.

thank you for your reply

when the piece of wire having resistance R is cut into 5 . then the resistance of each parts becomes R/5. due to the change in length from l to l/5.

now if the resistances are connected in parallel. the the resulting R' is 1/R' = 1/(R/5)+1/(R/5)+1/(R/5)+1/(R/5)+1/(R/5) => 1/R' = 5*(5/R) = 25/R => R' = R/25

so, the value of R/R' = 1/(1/25) = 25.