Physics, Chemistry, Maths Forum

physics

Thu, 17 May 2012 15:20:03 GMT

by dhara rathwa.

Two charged dust particles exert a force of 8.8 10-2 N on each other. What will be the force if they are moved so they are only one-fourth as far apart?

Re: probability

Thu, 10 May 2012 11:25:34 GMT

by hrittik roy.

I am solving the question assuming that the balls are indistinguishable since its not specified in the problem.

if the 1st box contains 3 balls this means there are 9 balls left to be distributed in 2 boxes whic can be done in 10C1 ways and the number of elements in the sample space is 14C3 so the probability should be 10/364

Relation and Function

Wed, 04 Apr 2012 20:42:19 GMT

by Archana Tikayat Ray.

Let S be a relation on the set R of all real numbers defined by:

S= {(a,b) E R * R : a^2+b^2=1 }

prove that S is not an equivalence relation on R.

Mechanics

Thu, 29 Mar 2012 13:35:43 GMT

by Vatika Harlalka.

The figure shows mass m moves with velocity u. Ring is restricted to move on smooth fixed horizontal rod. Velocity of the ring at that moment?

I thought the answer to be u/2 but the correct answer is 2u. This can happen if we take the rod to be the hypotenuse ie v(ring) * cos60 = u. please explain why?

Thermodynamics

Mon, 26 Mar 2012 03:01:06 GMT

by Anchal Saxena.

2.0 moles of helium are initially at a temperature of 27 deg. C and occupy a volume of 20 lt. The helium is first expanded at constant pressure until the temperature returns to its initial value.

(i) compute total heat supplied in the process.

(ii) what is the final volume.

Re: fluids

Sat, 24 Mar 2012 15:43:41 GMT

by Archana Tikayat Ray.

A body when dropped in fluid travels with increasing velocity till it attains a maximum constant velocity called TERMINAL VELOCITY.

fluids

Mon, 19 Mar 2012 12:30:29 GMT

by Shalvi Mahajan.

A ball of steel is dropped in a viscous medium draw its velocity time graph till it reaches the bottom.

probability

Sun, 04 Mar 2012 07:50:15 GMT

by Shalvi Mahajan.

12 balls are distributed among 3 boxes find the probabilty that 1st box will contain 3 balls?

complex numbers

Thu, 23 Feb 2012 08:04:27 GMT

by Rahul Sharma.

what is the geometric interpretation of l z-(1+3i) l + l z -( 1-3i) l = k , (a.) if k>6 (b.) if k=6 (c.) if k<6.

Re: chemical equilibrium

Wed, 22 Feb 2012 08:36:56 GMT

by Aashutosh Goyal.

PCl₅ ↔ PCl₃+Cl₂

a-x x x (total moles=a+x)

Kp=[1.5x/(a+x)][1.5x/(a+x)]/[1.5(a-x)/(a+x)]=0.3

On solving vol. % of Cl₂=100x/(a+x) can be obtained (vol. % is same as mol. % at const. pressure & temp.).