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Actually Arihant's books for all the three subjects are good.
But still you can practice from MCQ Maths.
Also buy some book which contain previous papers and mock tests and solve them.

Physical Pendulum
If a flat, rigid body is pivoted about any point other than its centre of mass and displaced by a small angle, the body will execute SHM .

The derivation is similar to that of a simple pendulum since one can consider all the mass M to be located at the body's center of mass. Then a physical pendulum looks like a simple pendulum except that its moment of inertia is found using the parallel axis theorem.

I_cm = the body's moment of inertia about its center of mass.

h = Distance from pivot point to the center of mass.

M = Mass of the body.

If the pivot joint is frictionless then the net torque acting on the planar object is given by the force of gravity perpendicular to lever arm, Mg sin(q), times the length of the lever arm, h:

When the angle of oscillation is small then the value of sin(q) and q or nearly the same provided q is measured in radians. Using this approximation, the above torque equation can be solved for the angular acceleration,

Since a =d²q/dt², this equation is structurally similar to the differential equation for any type of SHM,

Matching terms with SHM equations,

and

Here w' is instantaneous angular velocity of the body while w is angular frequency of the body's SHM. They are not the same. Moreover, w is constant while w' varies as the body oscillates back and forth.

Its best to start with physics as it is your strong subject and you will gain confidence at the starting moments. Then you should attempt chemistry section and pick the questions from strong topics and make a tickmark to those who you think can be cracked but would take time. Then attempt maths and finally return to those tickmarked questions and solve them.

e = -N(d

/dt)

The minus sign indicates that the current in the circuit due to the emf produces a magnetic field that acts to oppose the change in flux ( Lenz's Law).

The direction of induced current is such that it will oppose the its cause. Apply Right Hand Thumb Rule which would cause opposition.

See actually no such marks are alloted in JEE to the chapters specifically. But you can flick through the previous JEE papers and can analyse those papers that certain topics are important and have greater weightage, e.g. calculus, coordinate geometry,electricity and magnetism etc.

Attempts have been made to determine how long it takes for the electrons to absorb enough energy from the light to escape from the plate. No detectable time lag has been found. The electrons absorb the energy from the light beam nearly instantaneously. This result is independent of the intensity and frequency of the incident light (so long as the frequency is high enough to cause photoemission, of course).

The photon interpretation of the photoelectric effect predicts that there will be no appreciable time lag between light striking the surface of a metal and the start of photoemission. This is in complete agreement with the experimental results. Each electron absorbs the energy it needs to escape in a finite but very small interval of time. We can make a rough guess at the value of the amount of time the absorption occurs in, by setting it equal to the length of time it would take for a photon (traveling at the speed of light) to cross an electron. The size of an electron is not a well-determined quantity, but is of the order of 10^-14 m. Therefore, the absorption time is, roughly

10^-14/(3x10⁸) = 10^-22/3 sec

There is no way in which such a short time interval could be measured.

Yes buy some book which consists of previous years papers and mock tests to have a better idea of the questions asked in the exam.Solve those mock tests in the given time and analyse yourself. Check those questions which u were not able to solve and think over those and strengthen your concepts.

I must say that 1st you select your strong section among physics,chemistry and maths. And then pick the questions from your strong topics and solve them.While going through paper make a tick mark to a question who you think you can make but will consume sometime. After attempting your strong topics go ober these questions and still if you have time switch to the other questions left.

It would be nice if you complete your syllabus upto and whole January you can practice problems and give mock tests.It would be your plus point if you complete it in November.

I would suggest you to join some test series so as to be familiar to the examination environment. Also you will know your all India performance and check yourself where you stand.

Brilliant test series is nice and you may apply for it.

Refer to D C Pandey's book on mechanics. It has been explained nicely there and also solve some of the solved examples.

Yes S L Loney is the best book for coordinate geometry.
You may also refer to Arihant's coordinate geometry.

If {} denotes fractional part then {x+1} = {x-1} = {x}
Since 1 and -1 are integer, they will not contribute to the fractional part.
Hence f(x) = {x}

Now break the definite integral at integral values of x and substitute approriate {x} to get the final answer.

It takes sometime for the concept to sit in mind. I would suggest you to practice more and more and its better to go through some solved problems and think over the concepts used in those problems. Always right in your notebook whenever you encounter any new thing and revise it after sometime.

yahiyafirdous is correct.

1. Apply energy conservation for lowermost and topmost points of the path.

2. At the topmost point apply force equation and eqaute tension to zero to find the minimum velocity.

For details on chalk refer to :

http://www.geologyshop.co.uk/chalk.htm