In-Text Questions Solutions In Text-Questions Page 134 State the universal law of gravitation.Ans:- According to universal law of gravitation, every particle in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between them. The direction of force […]
In-Text Questions Solutions In Text-Questions Page 118 Which of the following has more inertia:(a) a rubber ball and a stone of the same size? (b) a bicycle and a train?(c) a five rupees coin and a one-rupee coin?Ans:- (a) Mass of a stone is more than the mass of a rubber ball of same size. […]
In-Text Questions Solutions In Text-Questions Page 100 An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.Ans:- Yes, an object moving through a distance can have zero displacement. This happens when final position of the object coincides with its initial position. For example, if a […]
Motion Important Questions : Solution Define uniform circular motion and give example of it. Why is it called accelerated motion? Sol:- Uniform circular motion can be described as the motion of an object in a circular path at a constant speed.Example:- Motion of an electron around the nucleus in a circular orbit, motion of the […]
Gravitation Important Questions An object is thrown vertically upward and rises to height of 10 m. Calculate the (i) the velocity by which the object was thrown upward and (ii) the time taken by object to reach the highest point. The mass of earth is 6.4 x 1024 kg and that of the moon is […]
Sound Notes Sound:- Sound is a form of energy which produces a sensation of hearing in our ears. Vibration:- A kind of rapid to and fro motion of an object is called vibration. Sound is produced by vibrating objects. Wave:- A wave is a disturbance that moves through a medium when the particles of medium […]
Gravitation Notes Gravitational force:- The force of attraction between any two objects in the universe is called gravitational force. Universal law of gravitation:- Every object in the universe attracts every other object with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between them. […]
Work and Energy Important Questions Define 1 watt of power. What is the commercial unit of energy. Convert it to the S.I. unit. Derive the formula for kinetic energy. . State law of conservation of energy. Show that the total mechanical energy for a freely falling body remain constant/conserved. Calculate the total electricity bill amount […]
Work and Energy Notes Work:- Work is said to be done if a force is applied on an object & it displaces in the direction of force applied. S.I. unit:- Joule (J) It is a scalar quantity. Work done = Force x displacement (W = FS) 1 Joule :- The work done on an object […]
Force and Laws of Motion Important Questions Using second law of motion, derive the relation between force & acceleration. A bullet of 10 g strikes a sand-bag at a speed of 1000 m/s & gets embedded after travelling 5 cm. Calculate : the resistive force exerted by the sand on the bullet the time taken […]