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Showing posts from July, 2018

### XI Physics | Dot Product Solved Numericals

Q.15 Find the angle between A=2i + 2j – k and B=6i – 3j +2k. Q.16 Find the projection of the vector A= i – 2j + k on to the direction of vector B=4i – 4j +7k Q. 17 Find the angles alpha, beta and gamma which the vector A=3i – 6j +2k makes with the positive x,y,z axis respectively. Q.18 Find the work done in moving an object along a vector r=3i – 2j +5k is the applied force is F=2i – j – k. Q.19 Find the work done by a force 30,000 N in moving an object through a distance of 45 m when :(a) force is in the direction of motion;(b) force makes an angle of 40 degrees to the direction of motion.Find the rate at which the force is working at a time when the velocity is 2 m/s. Q.20 Two vectors A and B such that |A|=3, |B|=4 and A. B=-5 , find (a) The angle between A and B. (b) The Length |A+B| and |A-B| (c) The angle between (A+B) and (A-B)

### Definition of Henry

Frequently asked questions about Henry:1. What is the definition of Henry in Physics?
2. What is the definition of Henry in Electromagnetic induction?
3. Henry is the unit of?
4. What is Henry?
5. One Henry is equal to?

Definition of Henry in terms of Self Inductance:-            Henry is the S.I. Unit of Self Inductance."The self inductance of a coil is 1 Henry if the current varying through it at the rate of 1 ampere per second induces a back emf of 1 volt."
Definition of Henry in terms of Mutual Inductance:- Henry is also the S.I. Unit of Mutual Inductance."The mutual inductance of a coil is 1 Henry if the current varying through primary coil at the rate of 1 ampere per second induces a back emf in secondary coil of 1 volt."

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### How To Survive An Elephant Attack

The Concept applied is " Inertia"...

Inertia:

Everybody in this universe has a property that it always offers some resistance to the change of its state. This property is known as Inertia and it is because of the mass of body. Therefore we need force to overcome inertia for the change of its state, either rest or motion.

### X Lecture No.3 | Physical Quantities

Do you know ?

1. How long is One meter?
2. One Second is how long duration?
3. One kilogram is the mass of which object?
4. Which quantities are measured in Physics and Which are not measured in Physics?

This Lecture Includes:

1. Physical and Non Physical Quantities
2. Basic / Fundamental Quantities
3. Derived Quantities with examples
4. Conversions of length , mass and time.