Madhuparna Bhowmik

while taking relative displacement i do not understand which direction should be taken positive

for ex.

A--------50m-------------B

then if we are considering that both are moving in the same direction say towards B then what is s relative when we are taking B w.r.t A and when we are taking A w.r.t B

similarly when they are moving towards each other ...... tell me s relative in both the cases

two cars leave one after the other and travel with and acceleration of 0.4 m/s^2 . two minutes after the departure of the first car, the distance between them becomes 1.90 km . the time interval between their departures is

A)50s B)60s C)70s D)80s

a particle projected vertically upwards. attains a maximum height H . if the ratio of the times to attain a height h (h<H) is 1/3 . then

A)4h=3H B) 3h=4H C)3h=H

D)4h=H

it might happen that all the options are wrong..........so do not consider them if your answer varies........i just want the correct method to solve such problems

the distance x covered by a particle in one - dimensional motion varies with time t as x^2 = at^2 +2bt +c. the acceleration of the particle is

a)x^-3 b)x^3/2 c)x^2 d)x^-2/3

i am a beginner in , i have just learnt differentiation ,i do not understand that why do we differentiate both the sites.

i mean its solution begins with

2x .dx/dt = 2at +2b

please explain me that why we have done so

thank you

a body is thrown vertically upward with a velocity u . the distance travelled by it in the 7th second and 8th second are equal . the displacement in 8th seconds is equal to(take g =10m/s^2)

1)5m 2)10m 3)2.5m 4)5/3m

two particles P and Q are initially 40 m apart P behind Q . particle P starts moving with a uniform velocity 10 m/s towards Q . particle Q starting from rest has an acceleration 2 m/s^2 in the direction of velocity of P. then the minimum distance between P and Q will be

1)45m 2)15m 3)35m 4)30m

there is gravity between sun and earth , between sun and neptune also. then if we are saying that all the planets are there in the solar system because of the gravitational force between sun and them. then why an object in space does not get attracted towards sun???????i mean if we are in space somewhere between earth and mars and out of the influence of earth's gravitational force but still not sure but according to me sun's gravitational force is still there then why don't we get attracted towards sun just like what happens on earth(we get attracted towards earth)???????

IN RUTHERFORD'S ALPHA PARTICLE SCATTERING EXPERIMENT IT IS SAID THAT THE ALPHA PARTICLES WHICH REBOUND ARE DEFLECTED BY AN ANGLE OF 180 DEGREE.........BUT HOW CAN BE THE ANGLE 180 DEGREE....IT SHOULD BE EITHER 0 DEGREE OR 360 DEGREE

IF ABCD IS A CYCLIC QUADRILATERAL SUCH THAT 12tanA - 5=0 AND 5cosA+3=0, THEN THE QUADRATIC EQUATION WHOSE ROOTS ARE cosC AND tanD IS

1) 39x^2 -16x -48 =0

2)39x^2 +88x +48 =0

3)39x^2 -88x +48 =0

4)39x^2-13x -46 =0

THE MOTION OF A BODY IS GIVEN BY THE EQUATION dv/dt=4-2v , WHERE v IS THE SPEED IN m/s AND t IN s.IF THE BODY WAS AT REST AT t=0,THEN FIND SPEED OF BODY AS A FUNCTION OF TIME.

THE ANSWER IS v=2(1-e^-2t)

1)0.328

2)0.126

3)85.38

4)0.012

i have just approached to some new formula.

and want to know if it is new or already existing.

(n+1)^2 - (n)^2 = (2n + 1)

that is , the difference of squares of two consecutive numbers is equal to the sum of the numbers.

for example-

(4)^2 -(3)^2 = 4+3

16 - 9 =7

7= 7

also can be written as

n=3

(3+1)^2 + (3)^2 =(2 * 3 +1)

also this means that if we add odd numbers starting from 1 to the squares of the number starting from 0 we get the square of the next number

for example-

0^2 +1 = 1^2

1^2 +3 =2^2

2^2 +5 =3^3

3^2 +7 =4^2

and so on ...............

please give me correct advise and information about whether it is something new that i have found or a different version of some already done work.

thank you...........

please briefly tell me about lymph , lymphatic system , lymph nodes in easy words and in class 10th level.

thank you.

is sinA +cosA = √2 sin(90° -A) , find the value of cot A.

THANKS.....

is it something related to osmosis?

please explain scientifically .