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 HEMANT BHARDWAJ's messages in the community 1 2 3 ... 41 42 43 GO Go to Page...
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 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
curved sphere? or hemisphere?
 Discussion Forums -> This Post 5 points    (1    in 1 votes )   [?]
frinstion acts at lowest point which remain at rest in case of pure rolling and hence work done by it is zero
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
if particle is undergoing uniform circular motion then torque will not be acting on it hence momentum(angular) will remain conserved for all stationary pt
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
ya surely answer of b is wrong in book if it is what u r saying.
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
u can read it"s explanation in haliday resnick walker
actually pi was used to just make few calculation easier
 This Post 0 points    (0    in 0 votes )   [?]
great............. but what abt i think it is a joke....... right?
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

why don"t u try on urself??????????

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
if we assume that battery has some internal resistance then we can give the some answer otherwise infinite current will flow through tht battery and as there is no resistance anywhere so battery will become dead instantly(in infinitely small time) and sparking will occur
 Discussion Forums -> This Post 7 points    (1    in 2 votes )   [?]

## and net rotational Kinetic energy decreases.

Actually net kinetic energy will not decrease but will increase as KE=L2/2I

here L is constant while I is decreasing hence KE shouid increase....

Question : Where does this extra energy come from?

while pulling his arms some work will be done by man and energy will come from his internal energy.

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
i think answer is B although i m not sure
work will be done coz direction of magnetic field (and this force on north pole ) will be tangential (given by right hand rule) hence some work would be done
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

### if P is replaced by a cell with lower emf than Q then u can not achieve balance point.now u can think y not............

 Discussion Forums -> This Post 2 points    (0    in 1 votes )   [?]

### B-As no current flows through galvanometre, cell Q , or resistance S when potential metre is at balanced position.Hence there will be no effect of decreasing\increasing value of S..

 Discussion Forums -> This Post 10 points    (2    in 2 votes )   [?]

### Next suppose u increased the resistance which will result decrease in value of current in potential metre so for producing same potential drop=EMF of cell Q u hav to shift the balance point toward"s B..

 Discussion Forums -> This Post 5 points    (1    in 1 votes )   [?]
##### Any satellite never fall itself !

but when a satellite become old and useless then it is made to fall on earth so that it may not collide with some other space shuttle ot satellite in future

 Discussion Forums -> This Post 7 points    (1    in 2 votes )   [?]
Hence i think abhi has done a small mistake while stating that
(IF GOING UP OR DOWN WITH A CONSTANT ACCn then also no effect)

 Discussion Forums -> This Post 5 points    (1    in 1 votes )   [?]

if lift is going up or down with constant velocity then the tension will be same as it was (when it was at rest) but if it os going upward with some aceeleration (no matter constant or not) then effective value of g will increase and hence tension will also increase. and xactly opposite if going downward with some acceleration.

 This Post 0 points    (0    in 0 votes )   [?]
really tough 1
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

using very general formula of impulse

impulse=change in momentum=avg Force * time

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

it is not given that wether he travelled 1Km distance by constant speed or non uniform speed. but since change in linear momentum of man is zero(if man comes to rest after waiking this distanceand was initially at rest) then avg friction force will be zero since friction force is the only external force which can act on the man in horizontan direction.

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
question is incomplete current or voltage and mass of ice e.t.c must be given
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