F=m1 *m2,direct proportn.then,m=dv,densistity timez volume.wit da density sam,da volume z equal to r^3.if r z nw doubld ,(2r)^3 wich z equal to 8r^3 separatly for da two bodiez.so far m z directly proportnal to r^3,then m 1* m2=8r^3 * 8r^3,so increasez by a factor 64

buzyguy: The gravitational force of attractn btwn two spherical bodiez having equal densities is increasd or decreasd by a factor of what if the radius of each body z doubled,a.increasd by 4 b.increasd by 64 c.decreasd by 4 d.decreasd by 2

buzyguy: Two particlez each of mass 2kg collide with 10N/m^2 occupiez a volume of 30m^3.calculate the rms value of their velocitiez in m/s.

broda please help me because i am not good in physics............ Root mean squared velocity=sqrt(3pv/m)=sqrt[(3*30*10)/2]=21.13m/s

F-mgsin@=ma,then afta doubld it bcmz 2f-mgsin@=ma,sinc a2=(2f/m)-(mgsin@)/m,nd a1=(f/m)-(mgsin@/m),a2/a1 z nw equal to [2(f-mgsin@)/f-mgsin@] + [mgsin@/f-mgsin@]=2 +[mgsin@/f-mgsin@],hence a2>2a1

buzyguy: Sum1 try ds:a crate which z pulld up a smooth inclined plane with a force F moves up the plane with an acceleratn of a.if F z doubld,the acceleratn,a.is quadrupld b.more than doubld c.doubld d.lez dan doubld

buzyguy: Sum1 try ds:a crate which z pulld up a smooth inclined plane with a force F moves up the plane with an acceleratn of a.if F z doubld,the acceleratn,a.is quadrupld b.more than doubld c.doubld d.lez dan doubld

Ah,if u wld b good at physcz nko?u wil nw bcom a physcz wizard.u missd out da number of particlez(N),den itz done.wizard 2be!u r 2gud.

emmyeuler1: broda please help me because i am not good in physics............ Root mean squared velocity=sqrt(3pv/m)=sqrt[(3*30*10)/2]=21.13m/s

buzyguy: Ah,if u wld b good at physcz nko?u wil nw bcom a physcz wizard.u missd out da number of particlez(N),den itz done.wizard 2be!u r 2gud.

K.....SINCE THERE ARE 2 PARTICLES INVOLVED N=2....R.M.S VELOCITY=SQRT[3PV/NM]=SQRT((3*30*10)/2*2)=15m/s

Yeah,absolutely correct!

emmyeuler1: K.....SINCE THERE ARE 2 PARTICLES INVOLVED N=2....R.M.S VELOCITY=SQRT[3PV/NM]=SQRT((3*30*10)/2*2)=15m/s

Da emf of a cell depends on da followni)chargez (ii)electrodz (iii) internal resistnce (iv)concentratn of electrolyt. A ii iii & iv b. iii c.ii d.all

buzyguy: Da emf of a cell depends on da followni)chargez (ii)electrodz (iii) internal resistnce (iv)concentratn of electrolyt. A ii iii & iv b. iii c.ii d.all

I DONT KNOW IT...BUT THE ANS IS B

Hmm,u tried 4dat...it depndz only on da electrod material

emmyeuler1: I DONT KNOW IT...BUT THE ANS IS B

I mean c

emmyeuler1: I DONT KNOW IT...BUT THE ANS IS B

buzyguy: Hmm,u tried 4dat...it depndz only on da electrod material

but emf=Ir+V....which shows direct proportion between emf and internal resistance

Itz true bt nt applicable,unda mechinez mechanical advantage z blievd to be independent of load,nd we all knw dat they r linked by direct proportn.also elasticity,youngz modulus z believd to be independent on any of itz parameterz bt yet it increases as the stress.datz y physcz z sumhw intricate

emmyeuler1: but emf=Ir+V....which shows direct proportion between emf and internal resistance

buzyguy: Itz true bt nt applicable,unda mechinez mechanical advantage z blievd to be independent of load,nd we all knw dat they r linked by direct proportn.also elasticity,youngz modulus z believd to be independent on any of itz parameterz bt yet it increases as the stress.datz y physcz z sumhw intricate

I HATE PHYSICS.AS A RESULT, I DONT KNOW THE SUBJECT....

Ok lemi ask ds:wotz da nature of the graph relatnshp btwn current nd voltage at verticl nd horizontal axiz respectvly?a.positive slope wit zero origin b.negativ slope wit intercptz on both axes c.positiv slope wit negativ nd positve intercepts on verticl nd horizntal axiz respectvly d.positv slope wit negtive nd positve intercptz on horizontl nd verticl axiz respctvly.

Ok,chemstry:the product of reactn btwn excez ethanol nd conc.H2SO4 at 145degcelsiuz is,a.ethene b.ethanoic acid c. diethysulphate d.ethoxyethane

The compound formd when da two end alkyl groupz of propyl ethanoate are interchangd z,a.methyl propanoate b.ethyl propanoate c.methyl butanoat d.ethyl butanote

buzyguy: Ok lemi ask ds:wotz da nature of the graph relatnshp btwn current nd voltage at verticl nd horizontal axiz respectvly?a.positive slope wit zero origin b.negativ slope wit intercptz on both axes c.positiv slope wit negativ nd positve intercepts on verticl nd horizntal axiz respectvly d.positv slope wit negtive nd positve intercptz on horizontl nd verticl axiz respctvly.

IT DEPENDS.... IF IT WERE OHMS LAW ,THE ANS IS A.... SINCE V=IR....BUT 4 A CELL THE ANSWER IS B

50cm3 of 0.10mol/dm3 Hcl solutn z mixed with 50cm3 of 0.15mol/dm3 NaoH Solutn.what z the pH of da resulting solution?

I mean Wit appriciable interna resistnce

emmyeuler1: IT DEPENDS.... IF IT WERE OHMS LAW ,THE ANS IS A.... SINCE V=IR....BUT 4 A CELL THE ANSWER IS B

buzyguy: Ok,chemstry:the product of reactn btwn excez ethanol nd conc.H2SO4 at 145degcelsiuz is,a.ethene b.ethanoic acid c. diethysulphate d.ethoxyethane

ANS IS C

buzyguy: The compound formd when da two end alkyl groupz of propyl ethanoate are interchangd z,a.methyl propanoate b.ethyl propanoate c.methyl butanoat d.ethyl butanote

ANS C

buzyguy: I mean Wit appriciable interna resistnce

E-V=v....where v=ir=lost voltage,V=terminal p.d and E=emf....if follows dat E-V=Ir....HENCE,V=-Ir-E THEN Ir=-V-E....DIVIDING BOTH SIDES BY r gives I =V/r-E/r... COMPARING WITH EQUATION OF A STRAIGHT LINE Y=MX+C....Y=I,X=V,M=-1/r and C=-E/r....it going to be a graph with negative slope with intercept on both axis...ANS(B)

Let questnz rush in.

WHAT IS ANOTHER NAME FOR A CUMMUTATOR AND WHAT IS IT USED FOR?

WHAT IS THE DIMENSION OF ENERGY DENSITY?

Correct

emmyeuler1: ANS IS C

Correct!

emmyeuler1: ANS C

Reversez inducd current nd thereby ensurez flow in sam directn.

emmyeuler1: WHAT IS ANOTHER NAME FOR A CUMMUTATOR AND WHAT IS IT USED FOR?

Hmm,sam as pressur f/A:M/T^2L

emmyeuler1: WHAT IS THE DIMENSION OF ENERGY DENSITY?

buzyguy: Hmm,sam as pressur f/A:M/T^2L

ENENERGY DENSITY=ENERGY/AREA=(MLT^-2)(L)/L^2=MT^-2

Hmm,i tnk itz energy over volume nau.chck it wel nt area.

emmyeuler1: ENENERGY DENSITY=ENERGY/AREA=(MLT^-2)(L)/L^2=MT^-2

Hmm,u av really done gr8t..rearrange to giv interceptz E/r,i=(E-V) /r on da vertcl axis nd E,V=E-Ir on da horizontal axis

emmyeuler1: E-V=v....where v=ir=lost voltage,V=terminal p.d and E=emf....if follows dat E-V=Ir....HENCE,V=-Ir-E THEN Ir=-V-E....DIVIDING BOTH SIDES BY r gives I =V/r-E/r... COMPARING WITH EQUATION OF A STRAIGHT LINE Y=MX+C....Y=I,X=V,M=-1/r and C=-E/r....it going to be a graph with negative slope with intercept on both axis...ANS(B)