# Search results

• Users: anand
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1. ### Lens system

I don't quite understand.

3. ### System of charges

Actually,the question was of an objective type,and the options involved only the sign of charge.Here are the four options given: a.possible only if q3 is positive b.possible only if q3 is negative c.possible irrespective of sign of q3 d.not possible at all So is the correct option c...
4. ### System of charges

Homework Statement Two point charges + q1 and + q2 are fixed with a finite distance d between them.It is desired to put a third charge q3 in between these two charges on the line joining them so that the charge q3 is in equilibrium.What has to be the charge on q3 to make this possible/...
5. ### Lens system

Homework Statement A combination of two thin convex lenses of equal focal lengths,is kept separated along the optic axes by a distance of 20 cm between them.The combination behaves as a lens system of infinite focal length.If an object is kept at 10 cm from the first lens,its image...

7. ### Pebble on wheel

Homework Statement A wheel of radius R rolls along the ground with velocity V. A pebble is carefully released on top of the wheel so that it is instantaneously at rest on the wheel. (a) Show that the pebble will immediately fly off the wheel if V> sqrt(Rg) (b) Show that in the case where V<...
8. ### 3000 solved problems from schaum.

Not Tipler. All I've done is collect the links to PDF files,from the course websites of various universities.Yes,they contain full solutions to most problems.
9. ### 3000 solved problems from schaum.

I have collected links to solutions of Kleppner and Kolenkow book here: http://physicscosmos.googlepages.com [Broken] Hope you find it useful.
10. ### Find the period of a pendulum

Thanks a lot!

12. ### Find the period of a pendulum

Here is how I did the first part: First find the total moment of inertia around an axis passing through the pivot.That would be 1/3 ml^2+1/2MR^2+Ml^2 The centre of mass of the system can be found,which is C=(ml/2+Ml)/(m+M) The component of the weight tangential to motion is (M+m)g...
13. ### Find the period of a pendulum

Homework Statement Find the period of a pendulum consisting of a disk of mass M and radius R fixed to the end of a rod of length l and mass m.How does the period change if the disk is mounted to the rod by a frictionless bearing so that it is perfectly free to spin? Homework Equations...
14. ### Block on a sphere

Thanks. But what if I try to resolve the forces along the "upright" x and y axes,i.e,I get N cos(theta)=mg+mv^2/R cos(theta) and N sin(theta)= mv^2/R sin(theta) and the energy equation. Now,how do I find the theta at which N becomes zero(which is when it loses contact,right?)
15. ### Block on a sphere

Homework Statement A small block slides from rest from the top of a frictionless sphere of radius R.How far below the top,x,does it lose contact with the sphere?(Sphere doesn't move) The Attempt at a Solution The angle subtended by the block at the centre of the sphere can be taken...
16. ### Surface integral

Thanks a lot.:smile: (The question did ask not to use divergence theorem,by the way)
17. ### Surface integral

I know this is a bit embarrassing for me,but how d'you integrate (a^2/z- 3z)dxdy .After having substituted for z,and converted to polar co-ordinates,I get zero in the denominator! This is the expression: [double integral]a^2/(sqrt(a^2-x^2-y^2)) dx dy. For conversion to polar co-ords,if I...
18. ### Surface integral

Homework Statement Evaluate [double integral]f.n ds where f=xi+yj-2zk and S is the surface of the sphere x^2+y^2+z^2=a^2 above x-y plane. The Attempt at a Solution I know that the sphere's orthogonal projection has to be taken on the x-y plane,but I'm having trouble with the...
19. ### Surface integral

Problem : Evaluate [double integral]f.n ds where f=xi+yj-2zk and S is the surface of the sphere x^2+y^2+z^2=a^2 above x-y plane. My effort:: I know that the sphere's orthogonal projection has to be taken on the x-y plane,but I'm having trouble with the integration.Please help!
20. ### Bouncing ball elastic collision

Here is how I thought of doing it. Use impulse=change in momentum for successive bounces and add them all up(infinite series).Assume the force F to be a constant,so that it can be taken out of the integral sign.To find force F,use work=change in kinetic energy. The distance traveled by the...
21. ### Bouncing ball elastic collision

A ball drops to the floor and bounces,eventually coming to rest.Collisions between the ball and floor are elastic;the speed after each collision is e times the speed before collision where e<1.If speed just before 1st bounce is v,find the time taken to come to rest.
22. ### Air bubble

Thanks a lot!
23. ### Air bubble

Why is the pressure inversely proportional to the volume and not the surface area?
24. ### Air bubble

Homework Statement An air bubble of radius 2mm if formed at the bottom of a 3.3m deep river.Calculate radius of bubble as it comes to the surface. atmospheric pressure=10^5 pa and density of water=1000 kg/m^3
25. ### I want to study real physics where to start?

KLEPPNER AND KOLENKOW is the best mechanics book on the planet.:smile:
26. ### Force needed to pull the string

A mass M whirls around on a string which passes through a ring .Neglect gravity.Initially the mass is distance Ro from the center and is revolving at angular velocity Wo.The string is pulled with constant velocity V starting at t=0 so that the radial distance to the mass decreases.Draw a force...
27. ### Help with solutions

I am a high school physics student.I have a textbook on mechanics by Kleppner and Kolenkow.it's a great book with just one problem.all the exercise problems haven't been provided with an answer .so,it's maddening because i can't know whether my answer is correct.does this book have a solutions book?
28. ### Wrong analogy

I read recently about an analogy to how general relativity tries to picture gravity. Its the one about a rubber sheet and a heavy sphere placed on it deforming it to cause a depression.Another ball in the region will tend to move towards this depression .But doesn't this assume the existence of...
29. ### Does a particle annihilate only with its corresponding antiparticle

Does a particle annihilate only with its corresponding antiparticle,or with any anti particle?Also,as a photon is its own antiparticle,when one photon collides with another, they should annihilate,shouldn't they?
30. ### Alternative theory

Is there any other theory except for the big bang which explains the origin of the universe satisfactorily and which has not been ruled out as yet?
31. ### Hy does every action have an equal and opposite reaction?

Heh heh.Actually I am a high school student.So, I don't really understand what you mean.Could you please explain?Any way,thanks for replying.
32. ### What is gravitational force

Could you explain.What I meant was that why doesn't it ever get exausted?
33. ### Hy does every action have an equal and opposite reaction?

Why does every action have an equal and opposite reaction?
34. ### Has controlled nuclear fusion been achieved?

Has controlled nuclear fusion been achieved?If not,is it a possibility in the foreseeable future?
35. ### What is gravitational force

What is gravitational forces' and electromagnetic forces' energy source?Don't they violate conservation of energy?
36. ### Frictional force is a manifestation

Frictional force is a manifestation of which fundamental force of nature?Is it the electromagnetic force?If so how?
37. ### Dr. Kaku mean by god of order?

What does Dr.Kaku mean by god of order?what does He do?What is meant by cosmic consciousness?